{
  "sources": {
    "nistSi": "https://www.nist.gov/pml/owm/metric-si/si-units",
    "nistApprox": "https://www.nist.gov/pml/owm/metric-si/unit-conversion/approximate-conversions-us-customary-measures-metric",
    "nistFactors": "https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b9",
    "bipm": "https://www.bipm.org/en/measurement-units"
  },
  "categories": [
    {
      "id": "length",
      "name": "Length",
      "blurb": "Metric, imperial, and distance conversions built from exact meter-based definitions.",
      "source": "SI meter definitions and exact international inch, foot, yard, and mile relationships.",
      "sourceUrl": "https://www.nist.gov/pml/owm/metric-si/si-units",
      "type": "linear",
      "base": "meter",
      "defaultFrom": "cm",
      "defaultTo": "in",
      "defaultAmount": 10,
      "units": [
        {
          "id": "nm",
          "singular": "nanometer",
          "plural": "nanometers",
          "symbol": "nm",
          "factor": 1e-9,
          "seo": "nanometers"
        },
        {
          "id": "um",
          "singular": "micrometer",
          "plural": "micrometers",
          "symbol": "um",
          "factor": 0.000001,
          "seo": "micrometers"
        },
        {
          "id": "mm",
          "singular": "millimeter",
          "plural": "millimeters",
          "symbol": "mm",
          "factor": 0.001,
          "seo": "mm"
        },
        {
          "id": "cm",
          "singular": "centimeter",
          "plural": "centimeters",
          "symbol": "cm",
          "factor": 0.01,
          "seo": "cm"
        },
        {
          "id": "m",
          "singular": "meter",
          "plural": "meters",
          "symbol": "m",
          "factor": 1,
          "seo": "meters"
        },
        {
          "id": "km",
          "singular": "kilometer",
          "plural": "kilometers",
          "symbol": "km",
          "factor": 1000,
          "seo": "km"
        },
        {
          "id": "mil",
          "singular": "mil",
          "plural": "mils",
          "symbol": "mil",
          "factor": 0.0000254,
          "seo": "mils"
        },
        {
          "id": "in",
          "singular": "inch",
          "plural": "inches",
          "symbol": "in",
          "factor": 0.0254,
          "seo": "inches"
        },
        {
          "id": "ft",
          "singular": "foot",
          "plural": "feet",
          "symbol": "ft",
          "factor": 0.3048,
          "seo": "feet"
        },
        {
          "id": "yd",
          "singular": "yard",
          "plural": "yards",
          "symbol": "yd",
          "factor": 0.9144,
          "seo": "yards"
        },
        {
          "id": "mi",
          "singular": "mile",
          "plural": "miles",
          "symbol": "mi",
          "factor": 1609.344,
          "seo": "miles"
        },
        {
          "id": "nmi",
          "singular": "nautical mile",
          "plural": "nautical miles",
          "symbol": "nmi",
          "factor": 1852,
          "seo": "nautical miles"
        }
      ]
    },
    {
      "id": "temperature",
      "name": "Temperature",
      "blurb": "Celsius, Fahrenheit, and Kelvin conversions with the formula shown beside the tool.",
      "source": "Temperature scale relationships from SI thermodynamic temperature definitions.",
      "sourceUrl": "https://www.bipm.org/en/measurement-units",
      "type": "temperature",
      "defaultFrom": "c",
      "defaultTo": "f",
      "defaultAmount": 20,
      "units": [
        {
          "id": "c",
          "singular": "degree Celsius",
          "plural": "degrees Celsius",
          "symbol": "°C",
          "seo": "Celsius"
        },
        {
          "id": "f",
          "singular": "degree Fahrenheit",
          "plural": "degrees Fahrenheit",
          "symbol": "°F",
          "seo": "Fahrenheit"
        },
        {
          "id": "k",
          "singular": "kelvin",
          "plural": "kelvin",
          "symbol": "K",
          "seo": "Kelvin"
        }
      ]
    },
    {
      "id": "weight",
      "name": "Weight",
      "blurb": "Mass and everyday weight conversions for grams, kilograms, ounces, pounds, and stones.",
      "source": "Kilogram-based SI definitions and exact avoirdupois pound relationships.",
      "sourceUrl": "https://www.nist.gov/pml/owm/metric-si/si-units",
      "type": "linear",
      "base": "kilogram",
      "defaultFrom": "kg",
      "defaultTo": "lb",
      "defaultAmount": 70,
      "units": [
        {
          "id": "mg",
          "singular": "milligram",
          "plural": "milligrams",
          "symbol": "mg",
          "factor": 0.000001,
          "seo": "mg"
        },
        {
          "id": "g",
          "singular": "gram",
          "plural": "grams",
          "symbol": "g",
          "factor": 0.001,
          "seo": "grams"
        },
        {
          "id": "kg",
          "singular": "kilogram",
          "plural": "kilograms",
          "symbol": "kg",
          "factor": 1,
          "seo": "kg"
        },
        {
          "id": "t",
          "singular": "metric ton",
          "plural": "metric tons",
          "symbol": "t",
          "factor": 1000,
          "seo": "metric tons"
        },
        {
          "id": "carat",
          "singular": "carat",
          "plural": "carats",
          "symbol": "ct",
          "factor": 0.0002,
          "seo": "carats"
        },
        {
          "id": "oz",
          "singular": "ounce",
          "plural": "ounces",
          "symbol": "oz",
          "factor": 0.028349523125,
          "seo": "ounces"
        },
        {
          "id": "lb",
          "singular": "pound",
          "plural": "pounds",
          "symbol": "lb",
          "factor": 0.45359237,
          "seo": "lbs"
        },
        {
          "id": "st",
          "singular": "stone",
          "plural": "stones",
          "symbol": "st",
          "factor": 6.35029318,
          "seo": "stone"
        },
        {
          "id": "ton_us",
          "singular": "U.S. ton",
          "plural": "U.S. tons",
          "symbol": "US ton",
          "factor": 907.18474,
          "seo": "U.S. tons"
        },
        {
          "id": "ton_uk",
          "singular": "imperial ton",
          "plural": "imperial tons",
          "symbol": "long ton",
          "factor": 1016.0469088,
          "seo": "imperial tons"
        }
      ]
    },
    {
      "id": "volume",
      "name": "Volume",
      "blurb": "Liquid, kitchen, and cubic volume conversions using stable metric and U.S. customary factors.",
      "source": "Liter, cubic meter, and U.S. customary liquid measure relationships.",
      "sourceUrl": "https://www.nist.gov/pml/owm/metric-si/unit-conversion/approximate-conversions-us-customary-measures-metric",
      "type": "linear",
      "base": "liter",
      "defaultFrom": "l",
      "defaultTo": "gal",
      "defaultAmount": 1,
      "units": [
        {
          "id": "mm3",
          "singular": "cubic millimeter",
          "plural": "cubic millimeters",
          "symbol": "mm³",
          "factor": 0.000001,
          "seo": "mm³"
        },
        {
          "id": "cm3",
          "singular": "cubic centimeter",
          "plural": "cubic centimeters",
          "symbol": "cm³",
          "factor": 0.001,
          "seo": "cm³"
        },
        {
          "id": "ml",
          "singular": "milliliter",
          "plural": "milliliters",
          "symbol": "mL",
          "factor": 0.001,
          "seo": "mL"
        },
        {
          "id": "cl",
          "singular": "centiliter",
          "plural": "centiliters",
          "symbol": "cL",
          "factor": 0.01,
          "seo": "cL"
        },
        {
          "id": "dl",
          "singular": "deciliter",
          "plural": "deciliters",
          "symbol": "dL",
          "factor": 0.1,
          "seo": "dL"
        },
        {
          "id": "l",
          "singular": "liter",
          "plural": "liters",
          "symbol": "L",
          "factor": 1,
          "seo": "liters"
        },
        {
          "id": "m3",
          "singular": "cubic meter",
          "plural": "cubic meters",
          "symbol": "m³",
          "factor": 1000,
          "seo": "m³"
        },
        {
          "id": "tsp",
          "singular": "U.S. teaspoon",
          "plural": "U.S. teaspoons",
          "symbol": "tsp",
          "factor": 0.00492892159375,
          "seo": "teaspoons"
        },
        {
          "id": "tbsp",
          "singular": "U.S. tablespoon",
          "plural": "U.S. tablespoons",
          "symbol": "tbsp",
          "factor": 0.01478676478125,
          "seo": "tablespoons"
        },
        {
          "id": "floz",
          "singular": "U.S. fluid ounce",
          "plural": "U.S. fluid ounces",
          "symbol": "fl oz",
          "factor": 0.0295735295625,
          "seo": "fluid ounces"
        },
        {
          "id": "cup",
          "singular": "U.S. cup",
          "plural": "U.S. cups",
          "symbol": "cup",
          "factor": 0.2365882365,
          "seo": "cups"
        },
        {
          "id": "pt",
          "singular": "U.S. pint",
          "plural": "U.S. pints",
          "symbol": "pt",
          "factor": 0.473176473,
          "seo": "pints"
        },
        {
          "id": "qt",
          "singular": "U.S. quart",
          "plural": "U.S. quarts",
          "symbol": "qt",
          "factor": 0.946352946,
          "seo": "quarts"
        },
        {
          "id": "gal",
          "singular": "U.S. gallon",
          "plural": "U.S. gallons",
          "symbol": "gal",
          "factor": 3.785411784,
          "seo": "gallons"
        },
        {
          "id": "igal",
          "singular": "imperial gallon",
          "plural": "imperial gallons",
          "symbol": "imp gal",
          "factor": 4.54609,
          "seo": "imperial gallons"
        },
        {
          "id": "in3",
          "singular": "cubic inch",
          "plural": "cubic inches",
          "symbol": "in³",
          "factor": 0.016387064,
          "seo": "in³"
        },
        {
          "id": "ft3",
          "singular": "cubic foot",
          "plural": "cubic feet",
          "symbol": "ft³",
          "factor": 28.316846592,
          "seo": "ft³"
        },
        {
          "id": "yd3",
          "singular": "cubic yard",
          "plural": "cubic yards",
          "symbol": "yd³",
          "factor": 764.554857984,
          "seo": "yd³"
        }
      ]
    },
    {
      "id": "area",
      "name": "Area",
      "blurb": "Square unit conversions for rooms, land, screens, plans, and materials.",
      "source": "Area units derived from exact length definitions; acre and hectare factors are fixed.",
      "sourceUrl": "https://www.nist.gov/pml/owm/metric-si/si-units",
      "type": "linear",
      "base": "square meter",
      "defaultFrom": "ft2",
      "defaultTo": "m2",
      "defaultAmount": 100,
      "units": [
        {
          "id": "mm2",
          "singular": "square millimeter",
          "plural": "square millimeters",
          "symbol": "mm²",
          "factor": 0.000001,
          "seo": "mm²"
        },
        {
          "id": "cm2",
          "singular": "square centimeter",
          "plural": "square centimeters",
          "symbol": "cm²",
          "factor": 0.0001,
          "seo": "cm²"
        },
        {
          "id": "m2",
          "singular": "square meter",
          "plural": "square meters",
          "symbol": "m²",
          "factor": 1,
          "seo": "m²"
        },
        {
          "id": "km2",
          "singular": "square kilometer",
          "plural": "square kilometers",
          "symbol": "km²",
          "factor": 1000000,
          "seo": "km²"
        },
        {
          "id": "in2",
          "singular": "square inch",
          "plural": "square inches",
          "symbol": "in²",
          "factor": 0.00064516,
          "seo": "in²"
        },
        {
          "id": "ft2",
          "singular": "square foot",
          "plural": "square feet",
          "symbol": "ft²",
          "factor": 0.09290304,
          "seo": "square feet"
        },
        {
          "id": "yd2",
          "singular": "square yard",
          "plural": "square yards",
          "symbol": "yd²",
          "factor": 0.83612736,
          "seo": "yd²"
        },
        {
          "id": "acre",
          "singular": "acre",
          "plural": "acres",
          "symbol": "acre",
          "factor": 4046.8564224,
          "seo": "acres"
        },
        {
          "id": "ha",
          "singular": "hectare",
          "plural": "hectares",
          "symbol": "ha",
          "factor": 10000,
          "seo": "hectares"
        },
        {
          "id": "mi2",
          "singular": "square mile",
          "plural": "square miles",
          "symbol": "mi²",
          "factor": 2589988.110336,
          "seo": "square miles"
        }
      ]
    },
    {
      "id": "speed",
      "name": "Speed",
      "blurb": "mph, km/h, m/s, ft/s, and knot conversions for travel, running, cycling, and marine use.",
      "source": "Speed units derived from exact length definitions and the SI second.",
      "sourceUrl": "https://www.nist.gov/pml/owm/metric-si/si-units",
      "type": "linear",
      "base": "meter per second",
      "defaultFrom": "mph",
      "defaultTo": "kph",
      "defaultAmount": 60,
      "units": [
        {
          "id": "mps",
          "singular": "meter per second",
          "plural": "meters per second",
          "symbol": "m/s",
          "factor": 1,
          "seo": "m/s"
        },
        {
          "id": "kph",
          "singular": "kilometer per hour",
          "plural": "kilometers per hour",
          "symbol": "km/h",
          "factor": 0.2777777777777778,
          "seo": "kph"
        },
        {
          "id": "mph",
          "singular": "mile per hour",
          "plural": "miles per hour",
          "symbol": "mph",
          "factor": 0.44704,
          "seo": "mph"
        },
        {
          "id": "fps",
          "singular": "foot per second",
          "plural": "feet per second",
          "symbol": "ft/s",
          "factor": 0.3048,
          "seo": "ft/s"
        },
        {
          "id": "knot",
          "singular": "knot",
          "plural": "knots",
          "symbol": "kn",
          "factor": 0.5144444444444445,
          "seo": "knots"
        }
      ]
    },
    {
      "id": "time",
      "name": "Time",
      "blurb": "Seconds, minutes, hours, days, and weeks without calendar assumptions.",
      "source": "Time units derived from the SI second and fixed minute/hour/day relationships.",
      "sourceUrl": "https://www.bipm.org/en/measurement-units",
      "type": "linear",
      "base": "second",
      "defaultFrom": "hour",
      "defaultTo": "min",
      "defaultAmount": 1,
      "units": [
        {
          "id": "ms",
          "singular": "millisecond",
          "plural": "milliseconds",
          "symbol": "ms",
          "factor": 0.001,
          "seo": "milliseconds"
        },
        {
          "id": "s",
          "singular": "second",
          "plural": "seconds",
          "symbol": "s",
          "factor": 1,
          "seo": "seconds"
        },
        {
          "id": "min",
          "singular": "minute",
          "plural": "minutes",
          "symbol": "min",
          "factor": 60,
          "seo": "minutes"
        },
        {
          "id": "hour",
          "singular": "hour",
          "plural": "hours",
          "symbol": "hr",
          "factor": 3600,
          "seo": "hours"
        },
        {
          "id": "day",
          "singular": "day",
          "plural": "days",
          "symbol": "day",
          "factor": 86400,
          "seo": "days"
        },
        {
          "id": "week",
          "singular": "week",
          "plural": "weeks",
          "symbol": "wk",
          "factor": 604800,
          "seo": "weeks"
        }
      ]
    },
    {
      "id": "digital",
      "name": "Digital",
      "blurb": "Bits, bytes, decimal storage units, binary storage units, and screen/image shortcuts.",
      "source": "Decimal SI prefixes and binary 1024-based prefixes for digital storage.",
      "sourceUrl": "https://www.nist.gov/pml/owm/metric-si/si-units",
      "type": "linear",
      "base": "byte",
      "defaultFrom": "mb",
      "defaultTo": "gb",
      "defaultAmount": 1024,
      "units": [
        {
          "id": "bit",
          "singular": "bit",
          "plural": "bits",
          "symbol": "bit",
          "factor": 0.125,
          "seo": "bits"
        },
        {
          "id": "b",
          "singular": "byte",
          "plural": "bytes",
          "symbol": "B",
          "factor": 1,
          "seo": "bytes"
        },
        {
          "id": "kb",
          "singular": "kilobyte",
          "plural": "kilobytes",
          "symbol": "KB",
          "factor": 1000,
          "seo": "KB"
        },
        {
          "id": "mb",
          "singular": "megabyte",
          "plural": "megabytes",
          "symbol": "MB",
          "factor": 1000000,
          "seo": "MB"
        },
        {
          "id": "gb",
          "singular": "gigabyte",
          "plural": "gigabytes",
          "symbol": "GB",
          "factor": 1000000000,
          "seo": "GB"
        },
        {
          "id": "tb",
          "singular": "terabyte",
          "plural": "terabytes",
          "symbol": "TB",
          "factor": 1000000000000,
          "seo": "TB"
        },
        {
          "id": "kib",
          "singular": "kibibyte",
          "plural": "kibibytes",
          "symbol": "KiB",
          "factor": 1024,
          "seo": "KiB"
        },
        {
          "id": "mib",
          "singular": "mebibyte",
          "plural": "mebibytes",
          "symbol": "MiB",
          "factor": 1048576,
          "seo": "MiB"
        },
        {
          "id": "gib",
          "singular": "gibibyte",
          "plural": "gibibytes",
          "symbol": "GiB",
          "factor": 1073741824,
          "seo": "GiB"
        },
        {
          "id": "tib",
          "singular": "tebibyte",
          "plural": "tebibytes",
          "symbol": "TiB",
          "factor": 1099511627776,
          "seo": "TiB"
        }
      ]
    },
    {
      "id": "data-rate",
      "name": "Data rate",
      "blurb": "Internet speed and file-transfer rate conversions using fixed bit and byte relationships.",
      "source": "Fixed digital relationships: 1 byte = 8 bits, with decimal SI prefixes for transfer rates.",
      "sourceUrl": "https://www.nist.gov/pml/owm/metric-si/si-units",
      "type": "linear",
      "base": "bit per second",
      "defaultFrom": "mbps",
      "defaultTo": "mbs",
      "defaultAmount": 100,
      "units": [
        {
          "id": "bps",
          "singular": "bit per second",
          "plural": "bits per second",
          "symbol": "bit/s",
          "factor": 1,
          "seo": "bit/s"
        },
        {
          "id": "kbps",
          "singular": "kilobit per second",
          "plural": "kilobits per second",
          "symbol": "Kbps",
          "factor": 1000,
          "seo": "Kbps"
        },
        {
          "id": "mbps",
          "singular": "megabit per second",
          "plural": "megabits per second",
          "symbol": "Mbps",
          "factor": 1000000,
          "seo": "Mbps"
        },
        {
          "id": "gbps",
          "singular": "gigabit per second",
          "plural": "gigabits per second",
          "symbol": "Gbps",
          "factor": 1000000000,
          "seo": "Gbps"
        },
        {
          "id": "bs",
          "singular": "byte per second",
          "plural": "bytes per second",
          "symbol": "B/s",
          "factor": 8,
          "seo": "B/s"
        },
        {
          "id": "kbs",
          "singular": "kilobyte per second",
          "plural": "kilobytes per second",
          "symbol": "KB/s",
          "factor": 8000,
          "seo": "KB/s"
        },
        {
          "id": "mbs",
          "singular": "megabyte per second",
          "plural": "megabytes per second",
          "symbol": "MB/s",
          "factor": 8000000,
          "seo": "MB/s"
        },
        {
          "id": "gbs",
          "singular": "gigabyte per second",
          "plural": "gigabytes per second",
          "symbol": "GB/s",
          "factor": 8000000000,
          "seo": "GB/s"
        }
      ]
    },
    {
      "id": "angle",
      "name": "Angle",
      "blurb": "Degrees, radians, gradians, and turns for math, maps, CAD, and code.",
      "source": "Angle relationships derived from a full turn equaling 2 pi radians.",
      "sourceUrl": "https://www.bipm.org/en/measurement-units",
      "type": "linear",
      "base": "radian",
      "defaultFrom": "rad",
      "defaultTo": "deg",
      "defaultAmount": 3.141592653589793,
      "units": [
        {
          "id": "rad",
          "singular": "radian",
          "plural": "radians",
          "symbol": "rad",
          "factor": 1,
          "seo": "radians"
        },
        {
          "id": "deg",
          "singular": "degree",
          "plural": "degrees",
          "symbol": "deg",
          "factor": 0.017453292519943295,
          "seo": "degrees"
        },
        {
          "id": "grad",
          "singular": "gradian",
          "plural": "gradians",
          "symbol": "grad",
          "factor": 0.015707963267948967,
          "seo": "gradians"
        },
        {
          "id": "turn",
          "singular": "turn",
          "plural": "turns",
          "symbol": "turn",
          "factor": 6.283185307179586,
          "seo": "turns"
        }
      ]
    },
    {
      "id": "pressure",
      "name": "Pressure",
      "blurb": "psi, bar, pascal, kilopascal, atmosphere, and mmHg conversions.",
      "source": "Pressure units derived from pascal relationships and fixed conventional factors.",
      "sourceUrl": "https://www.nist.gov/pml/owm/metric-si/si-units",
      "type": "linear",
      "base": "pascal",
      "defaultFrom": "psi",
      "defaultTo": "bar",
      "defaultAmount": 32,
      "units": [
        {
          "id": "pa",
          "singular": "pascal",
          "plural": "pascals",
          "symbol": "Pa",
          "factor": 1,
          "seo": "Pa"
        },
        {
          "id": "kpa",
          "singular": "kilopascal",
          "plural": "kilopascals",
          "symbol": "kPa",
          "factor": 1000,
          "seo": "kPa"
        },
        {
          "id": "bar",
          "singular": "bar",
          "plural": "bar",
          "symbol": "bar",
          "factor": 100000,
          "seo": "bar"
        },
        {
          "id": "psi",
          "singular": "pound per square inch",
          "plural": "pounds per square inch",
          "symbol": "psi",
          "factor": 6894.757293168,
          "seo": "psi"
        },
        {
          "id": "atm",
          "singular": "standard atmosphere",
          "plural": "standard atmospheres",
          "symbol": "atm",
          "factor": 101325,
          "seo": "atm"
        },
        {
          "id": "mmhg",
          "singular": "conventional millimeter of mercury",
          "plural": "conventional millimeters of mercury",
          "symbol": "mmHg",
          "factor": 133.322387415,
          "seo": "mmHg"
        }
      ]
    },
    {
      "id": "power",
      "name": "Power",
      "blurb": "Watts, kilowatts, mechanical horsepower, and International Table BTU per hour.",
      "source": "Power units derived from the watt; mechanical horsepower is 745.699871582 W and BTU/h uses the International Table BTU.",
      "sourceUrl": "https://www.nist.gov/pml/owm/metric-si/si-units",
      "type": "linear",
      "base": "watt",
      "defaultFrom": "hp",
      "defaultTo": "kw",
      "defaultAmount": 1,
      "units": [
        {
          "id": "w",
          "singular": "watt",
          "plural": "watts",
          "symbol": "W",
          "factor": 1,
          "seo": "watts"
        },
        {
          "id": "kw",
          "singular": "kilowatt",
          "plural": "kilowatts",
          "symbol": "kW",
          "factor": 1000,
          "seo": "kW"
        },
        {
          "id": "mw",
          "singular": "megawatt",
          "plural": "megawatts",
          "symbol": "MW",
          "factor": 1000000,
          "seo": "MW"
        },
        {
          "id": "hp",
          "singular": "mechanical horsepower",
          "plural": "mechanical horsepower",
          "symbol": "hp",
          "factor": 745.6998715822702,
          "seo": "hp"
        },
        {
          "id": "btuh",
          "singular": "International Table BTU per hour",
          "plural": "International Table BTU per hour",
          "symbol": "BTU (IT)/h",
          "factor": 0.2930710701722222,
          "seo": "BTU (IT)/h"
        }
      ]
    },
    {
      "id": "force",
      "name": "Force",
      "blurb": "Newtons, kilonewtons, pound-force, and kilogram-force for specs and load ratings.",
      "source": "Force units derived from the SI newton and fixed conventional pound-force and kilogram-force factors.",
      "sourceUrl": "https://www.nist.gov/pml/owm/metric-si/si-units",
      "type": "linear",
      "base": "newton",
      "defaultFrom": "n",
      "defaultTo": "lbf",
      "defaultAmount": 100,
      "units": [
        {
          "id": "n",
          "singular": "newton",
          "plural": "newtons",
          "symbol": "N",
          "factor": 1,
          "seo": "newtons"
        },
        {
          "id": "kn",
          "singular": "kilonewton",
          "plural": "kilonewtons",
          "symbol": "kN",
          "factor": 1000,
          "seo": "kilonewtons"
        },
        {
          "id": "lbf",
          "singular": "pound-force",
          "plural": "pound-force",
          "symbol": "lbf",
          "factor": 4.4482216152605,
          "seo": "lbf"
        },
        {
          "id": "kgf",
          "singular": "kilogram-force",
          "plural": "kilogram-force",
          "symbol": "kgf",
          "factor": 9.80665,
          "seo": "kgf"
        }
      ]
    },
    {
      "id": "torque",
      "name": "Torque",
      "blurb": "Newton meters, pound-feet, pound-inches, and ounce-inches for fasteners and motors.",
      "source": "Torque units derived from exact length factors and conventional force factors.",
      "sourceUrl": "https://www.nist.gov/pml/owm/metric-si/si-units",
      "type": "linear",
      "base": "newton meter",
      "defaultFrom": "nm",
      "defaultTo": "lbft",
      "defaultAmount": 100,
      "units": [
        {
          "id": "nm",
          "singular": "newton meter",
          "plural": "newton meters",
          "symbol": "N m",
          "factor": 1,
          "seo": "newton meters"
        },
        {
          "id": "lbft",
          "singular": "pound-foot",
          "plural": "pound-feet",
          "symbol": "lb ft",
          "factor": 1.3558179483314003,
          "seo": "lb ft"
        },
        {
          "id": "lbin",
          "singular": "pound-inch",
          "plural": "pound-inches",
          "symbol": "lb in",
          "factor": 0.1129848290276167,
          "seo": "lb in"
        },
        {
          "id": "ozin",
          "singular": "ounce-inch",
          "plural": "ounce-inches",
          "symbol": "oz in",
          "factor": 0.007061551814226044,
          "seo": "oz in"
        }
      ]
    },
    {
      "id": "frequency",
      "name": "Frequency",
      "blurb": "Hertz, kilohertz, megahertz, gigahertz, and RPM for signals and rotating speed.",
      "source": "Frequency units derived from the SI hertz and fixed revolutions-per-minute relationship.",
      "sourceUrl": "https://www.bipm.org/en/measurement-units",
      "type": "linear",
      "base": "hertz",
      "defaultFrom": "rpm",
      "defaultTo": "hz",
      "defaultAmount": 60,
      "units": [
        {
          "id": "hz",
          "singular": "hertz",
          "plural": "hertz",
          "symbol": "Hz",
          "factor": 1,
          "seo": "Hz"
        },
        {
          "id": "khz",
          "singular": "kilohertz",
          "plural": "kilohertz",
          "symbol": "kHz",
          "factor": 1000,
          "seo": "kHz"
        },
        {
          "id": "mhz",
          "singular": "megahertz",
          "plural": "megahertz",
          "symbol": "MHz",
          "factor": 1000000,
          "seo": "MHz"
        },
        {
          "id": "ghz",
          "singular": "gigahertz",
          "plural": "gigahertz",
          "symbol": "GHz",
          "factor": 1000000000,
          "seo": "GHz"
        },
        {
          "id": "rpm",
          "singular": "revolution per minute",
          "plural": "revolutions per minute",
          "symbol": "rpm",
          "factor": 0.016666666666666666,
          "seo": "rpm"
        }
      ]
    },
    {
      "id": "energy",
      "name": "Energy",
      "blurb": "Joules, kilowatt-hours, calories, BTU, watt-hours, and foot-pounds for electricity, heat, food, and mechanical work.",
      "source": "Energy factors from NIST SI conversion tables, using the joule as the shared reference unit.",
      "sourceUrl": "https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b9",
      "type": "linear",
      "base": "joule",
      "defaultFrom": "kwh",
      "defaultTo": "btu",
      "defaultAmount": 1,
      "units": [
        {
          "id": "ev",
          "singular": "electronvolt",
          "plural": "electronvolts",
          "symbol": "eV",
          "factor": 1.602176634e-19,
          "seo": "eV"
        },
        {
          "id": "j",
          "singular": "joule",
          "plural": "joules",
          "symbol": "J",
          "factor": 1,
          "seo": "joules"
        },
        {
          "id": "kj",
          "singular": "kilojoule",
          "plural": "kilojoules",
          "symbol": "kJ",
          "factor": 1000,
          "seo": "kJ"
        },
        {
          "id": "mj",
          "singular": "megajoule",
          "plural": "megajoules",
          "symbol": "MJ",
          "factor": 1000000,
          "seo": "MJ"
        },
        {
          "id": "wh",
          "singular": "watt-hour",
          "plural": "watt-hours",
          "symbol": "Wh",
          "factor": 3600,
          "seo": "Wh"
        },
        {
          "id": "kwh",
          "singular": "kilowatt-hour",
          "plural": "kilowatt-hours",
          "symbol": "kWh",
          "factor": 3600000,
          "seo": "kWh"
        },
        {
          "id": "cal",
          "singular": "thermochemical calorie",
          "plural": "thermochemical calories",
          "symbol": "cal",
          "factor": 4.184,
          "seo": "thermochemical calories"
        },
        {
          "id": "kcal",
          "singular": "thermochemical kilocalorie",
          "plural": "thermochemical kilocalories",
          "symbol": "kcal",
          "factor": 4184,
          "seo": "kcal"
        },
        {
          "id": "btu",
          "singular": "International Table British thermal unit",
          "plural": "International Table British thermal units",
          "symbol": "BTU (IT)",
          "factor": 1055.05585262,
          "seo": "BTU (IT)"
        },
        {
          "id": "ftlb_energy",
          "singular": "foot-pound",
          "plural": "foot-pounds",
          "symbol": "ft lb",
          "factor": 1.3558179483314003,
          "seo": "foot-pounds"
        }
      ]
    },
    {
      "id": "acceleration",
      "name": "Acceleration",
      "blurb": "Convert m/s², standard gravity, ft/s², Gal, and speed gained per second for physics, vehicles, and engineering.",
      "source": "Acceleration factors from NIST conversion tables, including standard gravity at exactly 9.80665 m/s².",
      "sourceUrl": "https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b9",
      "type": "linear",
      "base": "meter per second squared",
      "defaultFrom": "mps2",
      "defaultTo": "g0",
      "defaultAmount": 9.80665,
      "units": [
        {
          "id": "mps2",
          "singular": "meter per second squared",
          "plural": "meters per second squared",
          "symbol": "m/s²",
          "factor": 1,
          "seo": "m/s²"
        },
        {
          "id": "ftps2",
          "singular": "foot per second squared",
          "plural": "feet per second squared",
          "symbol": "ft/s²",
          "factor": 0.3048,
          "seo": "ft/s²"
        },
        {
          "id": "inps2",
          "singular": "inch per second squared",
          "plural": "inches per second squared",
          "symbol": "in/s²",
          "factor": 0.0254,
          "seo": "in/s²"
        },
        {
          "id": "g0",
          "singular": "standard gravity",
          "plural": "standard gravity",
          "symbol": "g",
          "factor": 9.80665,
          "seo": "g-force"
        },
        {
          "id": "gal_accel",
          "singular": "gal",
          "plural": "gals",
          "symbol": "Gal",
          "factor": 0.01,
          "seo": "Gal"
        },
        {
          "id": "kphps",
          "singular": "kilometer per hour per second",
          "plural": "kilometers per hour per second",
          "symbol": "km/h/s",
          "factor": 0.2777777777777778,
          "seo": "km/h/s"
        },
        {
          "id": "mphps",
          "singular": "mile per hour per second",
          "plural": "miles per hour per second",
          "symbol": "mph/s",
          "factor": 0.44704,
          "seo": "mph/s"
        }
      ]
    },
    {
      "id": "flow-rate",
      "name": "Flow rate",
      "blurb": "Volume flow conversions for liters, cubic meters, U.S. gallons, and cubic feet per unit of time.",
      "source": "Volume-per-time factors derived from NIST volume definitions and the SI second.",
      "sourceUrl": "https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b9",
      "type": "linear",
      "base": "liter per second",
      "defaultFrom": "lpm",
      "defaultTo": "gpm",
      "defaultAmount": 10,
      "units": [
        {
          "id": "lps",
          "singular": "liter per second",
          "plural": "liters per second",
          "symbol": "L/s",
          "factor": 1,
          "seo": "L/s"
        },
        {
          "id": "lpm",
          "singular": "liter per minute",
          "plural": "liters per minute",
          "symbol": "L/min",
          "factor": 0.016666666666666666,
          "seo": "L/min"
        },
        {
          "id": "lph",
          "singular": "liter per hour",
          "plural": "liters per hour",
          "symbol": "L/h",
          "factor": 0.0002777777777777778,
          "seo": "L/h"
        },
        {
          "id": "m3s",
          "singular": "cubic meter per second",
          "plural": "cubic meters per second",
          "symbol": "m³/s",
          "factor": 1000,
          "seo": "m³/s"
        },
        {
          "id": "m3h",
          "singular": "cubic meter per hour",
          "plural": "cubic meters per hour",
          "symbol": "m³/h",
          "factor": 0.2777777777777778,
          "seo": "m³/h"
        },
        {
          "id": "gpm",
          "singular": "U.S. gallon per minute",
          "plural": "U.S. gallons per minute",
          "symbol": "gpm",
          "factor": 0.06309019639999999,
          "seo": "gpm"
        },
        {
          "id": "gph",
          "singular": "U.S. gallon per hour",
          "plural": "U.S. gallons per hour",
          "symbol": "gph",
          "factor": 0.0010515032733333333,
          "seo": "gph"
        },
        {
          "id": "cfm",
          "singular": "cubic foot per minute",
          "plural": "cubic feet per minute",
          "symbol": "cfm",
          "factor": 0.47194744320000004,
          "seo": "cfm"
        }
      ]
    },
    {
      "id": "density",
      "name": "Density",
      "blurb": "Mass density conversions for kg/m³, g/cm³, g/mL, kg/L, lb/ft³, lb/in³, and lb/gal.",
      "source": "Mass-per-volume factors derived from exact mass and volume relationships in NIST conversion tables.",
      "sourceUrl": "https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b9",
      "type": "linear",
      "base": "kilogram per cubic meter",
      "defaultFrom": "kgm3",
      "defaultTo": "gcm3",
      "defaultAmount": 1000,
      "units": [
        {
          "id": "kgm3",
          "singular": "kilogram per cubic meter",
          "plural": "kilograms per cubic meter",
          "symbol": "kg/m³",
          "factor": 1,
          "seo": "kg/m³"
        },
        {
          "id": "gcm3",
          "singular": "gram per cubic centimeter",
          "plural": "grams per cubic centimeter",
          "symbol": "g/cm³",
          "factor": 1000,
          "seo": "g/cm³"
        },
        {
          "id": "gml",
          "singular": "gram per milliliter",
          "plural": "grams per milliliter",
          "symbol": "g/mL",
          "factor": 1000,
          "seo": "g/mL"
        },
        {
          "id": "kgl",
          "singular": "kilogram per liter",
          "plural": "kilograms per liter",
          "symbol": "kg/L",
          "factor": 1000,
          "seo": "kg/L"
        },
        {
          "id": "lbft3",
          "singular": "pound per cubic foot",
          "plural": "pounds per cubic foot",
          "symbol": "lb/ft³",
          "factor": 16.01846337396014,
          "seo": "lb/ft³"
        },
        {
          "id": "lbin3",
          "singular": "pound per cubic inch",
          "plural": "pounds per cubic inch",
          "symbol": "lb/in³",
          "factor": 27679.904710203125,
          "seo": "lb/in³"
        },
        {
          "id": "lbgal",
          "singular": "pound per U.S. gallon",
          "plural": "pounds per U.S. gallon",
          "symbol": "lb/gal",
          "factor": 119.82642731689663,
          "seo": "lb/gal"
        }
      ]
    },
    {
      "id": "electric-current",
      "name": "Electric current",
      "blurb": "Convert microamps, milliamps, amps, kiloamps, and megaamps without changing the electrical quantity.",
      "source": "SI ampere definitions and decimal SI prefixes from BIPM and NIST.",
      "sourceUrl": "https://www.nist.gov/pml/owm/metric-si/si-units",
      "type": "linear",
      "base": "ampere",
      "defaultFrom": "amp",
      "defaultTo": "mamp",
      "defaultAmount": 1,
      "units": [
        {
          "id": "uamp",
          "singular": "microampere",
          "plural": "microamperes",
          "symbol": "µA",
          "factor": 0.000001,
          "seo": "µA"
        },
        {
          "id": "mamp",
          "singular": "milliampere",
          "plural": "milliamperes",
          "symbol": "mA",
          "factor": 0.001,
          "seo": "mA"
        },
        {
          "id": "amp",
          "singular": "ampere",
          "plural": "amperes",
          "symbol": "A",
          "factor": 1,
          "seo": "amps"
        },
        {
          "id": "kamp",
          "singular": "kiloampere",
          "plural": "kiloamperes",
          "symbol": "kA",
          "factor": 1000,
          "seo": "kA"
        },
        {
          "id": "meamp",
          "singular": "megaampere",
          "plural": "megaamperes",
          "symbol": "MA",
          "factor": 1000000,
          "seo": "MA"
        }
      ]
    },
    {
      "id": "voltage",
      "name": "Voltage",
      "blurb": "Convert microvolts, millivolts, volts, kilovolts, and megavolts for circuits, electronics, and power systems.",
      "source": "SI volt definitions and decimal SI prefixes from BIPM and NIST.",
      "sourceUrl": "https://www.nist.gov/pml/owm/metric-si/si-units",
      "type": "linear",
      "base": "volt",
      "defaultFrom": "volt",
      "defaultTo": "mvolt",
      "defaultAmount": 12,
      "units": [
        {
          "id": "uvolt",
          "singular": "microvolt",
          "plural": "microvolts",
          "symbol": "µV",
          "factor": 0.000001,
          "seo": "µV"
        },
        {
          "id": "mvolt",
          "singular": "millivolt",
          "plural": "millivolts",
          "symbol": "mV",
          "factor": 0.001,
          "seo": "mV"
        },
        {
          "id": "volt",
          "singular": "volt",
          "plural": "volts",
          "symbol": "V",
          "factor": 1,
          "seo": "volts"
        },
        {
          "id": "kvolt",
          "singular": "kilovolt",
          "plural": "kilovolts",
          "symbol": "kV",
          "factor": 1000,
          "seo": "kV"
        },
        {
          "id": "mevolt",
          "singular": "megavolt",
          "plural": "megavolts",
          "symbol": "MV",
          "factor": 1000000,
          "seo": "MV"
        }
      ]
    },
    {
      "id": "resistance",
      "name": "Resistance",
      "blurb": "Convert milliohms, ohms, kilo-ohms, megaohms, and gigaohms for components and electrical measurements.",
      "source": "SI ohm relationships and decimal SI prefixes from BIPM and NIST.",
      "sourceUrl": "https://www.nist.gov/pml/owm/metric-si/si-units",
      "type": "linear",
      "base": "ohm",
      "defaultFrom": "ohm",
      "defaultTo": "kohm",
      "defaultAmount": 1000,
      "units": [
        {
          "id": "mohm_small",
          "singular": "milliohm",
          "plural": "milliohms",
          "symbol": "mΩ",
          "factor": 0.001,
          "seo": "mΩ"
        },
        {
          "id": "ohm",
          "singular": "ohm",
          "plural": "ohms",
          "symbol": "Ω",
          "factor": 1,
          "seo": "ohms"
        },
        {
          "id": "kohm",
          "singular": "kilo-ohm",
          "plural": "kilo-ohms",
          "symbol": "kΩ",
          "factor": 1000,
          "seo": "kΩ"
        },
        {
          "id": "mohm",
          "singular": "megaohm",
          "plural": "megaohms",
          "symbol": "MΩ",
          "factor": 1000000,
          "seo": "MΩ"
        },
        {
          "id": "gohm",
          "singular": "gigaohm",
          "plural": "gigaohms",
          "symbol": "GΩ",
          "factor": 1000000000,
          "seo": "GΩ"
        }
      ]
    },
    {
      "id": "illuminance",
      "name": "Illuminance",
      "blurb": "Convert lux, kilolux, foot-candles, phot, and nox for lighting design, workplaces, studios, and photography.",
      "source": "Illuminance factors from NIST light-unit conversion tables, using lux as the shared reference unit.",
      "sourceUrl": "https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b9",
      "type": "linear",
      "base": "lux",
      "defaultFrom": "lux",
      "defaultTo": "fc",
      "defaultAmount": 500,
      "units": [
        {
          "id": "nox",
          "singular": "nox",
          "plural": "nox",
          "symbol": "nox",
          "factor": 0.001,
          "seo": "nox"
        },
        {
          "id": "lux",
          "singular": "lux",
          "plural": "lux",
          "symbol": "lx",
          "factor": 1,
          "seo": "lux"
        },
        {
          "id": "klux",
          "singular": "kilolux",
          "plural": "kilolux",
          "symbol": "klx",
          "factor": 1000,
          "seo": "kilolux"
        },
        {
          "id": "fc",
          "singular": "foot-candle",
          "plural": "foot-candles",
          "symbol": "fc",
          "factor": 10.763910416709722,
          "seo": "foot-candles"
        },
        {
          "id": "phot",
          "singular": "phot",
          "plural": "phots",
          "symbol": "ph",
          "factor": 10000,
          "seo": "phot"
        }
      ]
    }
  ]
}