{
  "version": "v1",
  "source": "https://craftquantities.com",
  "licence": "CC BY 4.0",
  "licenceUrl": "https://creativecommons.org/licenses/by/4.0/",
  "attribution": "Craft Quantities — craftquantities.com",
  "documentation": "https://craftquantities.com/api/",
  "versioning": "Fields are added, never removed or repurposed, within a version. A breaking change becomes /api/v2/ and v1 keeps being built.",
  "note": "Factors are exact by statute or definition. The base value is (value + offsetToBase) × toBase; offsetToBase is absent, meaning zero, on every unit except the temperature scales.",
  "dimensions": [
    {
      "dimension": "length",
      "baseUnit": "m",
      "units": [
        {
          "id": "mm",
          "label": "Millimeters",
          "symbol": "mm",
          "system": "metric",
          "toBase": 0.001
        },
        {
          "id": "cm",
          "label": "Centimeters",
          "symbol": "cm",
          "system": "metric",
          "toBase": 0.01
        },
        {
          "id": "m",
          "label": "Meters",
          "symbol": "m",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "in",
          "label": "Inches",
          "symbol": "in",
          "system": "imperial",
          "toBase": 0.0254
        },
        {
          "id": "ft",
          "label": "Feet",
          "symbol": "ft",
          "system": "imperial",
          "toBase": 0.3048
        },
        {
          "id": "yd",
          "label": "Yards",
          "symbol": "yd",
          "system": "imperial",
          "toBase": 0.9144
        }
      ]
    },
    {
      "dimension": "area",
      "baseUnit": "m2",
      "units": [
        {
          "id": "m2",
          "label": "Square Meters",
          "symbol": "m²",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "ft2",
          "label": "Square Feet",
          "symbol": "sq ft",
          "system": "imperial",
          "toBase": 0.09290304
        },
        {
          "id": "mm2",
          "label": "Square Millimeters",
          "symbol": "mm²",
          "system": "metric",
          "toBase": 0.000001
        },
        {
          "id": "in2",
          "label": "Square Inches",
          "symbol": "in²",
          "system": "imperial",
          "toBase": 0.00064516
        }
      ]
    },
    {
      "dimension": "volume",
      "baseUnit": "l",
      "units": [
        {
          "id": "l",
          "label": "Liters",
          "symbol": "L",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "gal",
          "label": "Gallons (US)",
          "symbol": "gal",
          "system": "imperial",
          "toBase": 3.785411784
        },
        {
          "id": "m3",
          "label": "Cubic meters",
          "symbol": "m³",
          "system": "metric",
          "toBase": 1000
        },
        {
          "id": "ft3",
          "label": "Cubic feet",
          "symbol": "ft³",
          "system": "imperial",
          "toBase": 28.316846592
        },
        {
          "id": "yd3",
          "label": "Cubic yards",
          "symbol": "yd³",
          "system": "imperial",
          "toBase": 764.554857984
        }
      ]
    },
    {
      "dimension": "flow",
      "baseUnit": "lpm",
      "units": [
        {
          "id": "lpm",
          "label": "Liters per minute",
          "symbol": "L/min",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "lps",
          "label": "Liters per second",
          "symbol": "L/s",
          "system": "metric",
          "toBase": 60
        },
        {
          "id": "gpm",
          "label": "US gallons per minute",
          "symbol": "gal/min",
          "system": "imperial",
          "toBase": 3.785411784
        }
      ]
    },
    {
      "dimension": "airflow",
      "baseUnit": "lps",
      "units": [
        {
          "id": "lps",
          "label": "Litres per second",
          "symbol": "L/s",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "m3h",
          "label": "Cubic metres per hour",
          "symbol": "m³/h",
          "system": "metric",
          "toBase": 0.2777777777777778
        },
        {
          "id": "lpm",
          "label": "Litres per minute",
          "symbol": "L/min",
          "system": "metric",
          "toBase": 0.016666666666666666
        },
        {
          "id": "cfm",
          "label": "Cubic feet per minute",
          "symbol": "CFM",
          "system": "imperial",
          "toBase": 0.47194744320000004
        }
      ]
    },
    {
      "dimension": "velocity",
      "baseUnit": "ms",
      "units": [
        {
          "id": "ms",
          "label": "Metres per second",
          "symbol": "m/s",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "fpm",
          "label": "Feet per minute",
          "symbol": "ft/min",
          "system": "imperial",
          "toBase": 0.00508
        },
        {
          "id": "fps",
          "label": "Feet per second",
          "symbol": "ft/s",
          "system": "imperial",
          "toBase": 0.3048
        }
      ]
    },
    {
      "dimension": "waterrate",
      "baseUnit": "per_m3",
      "units": [
        {
          "id": "per_m3",
          "label": "Per cubic meter",
          "symbol": "per m³",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "per_1000gal",
          "label": "Per 1,000 US gallons",
          "symbol": "per 1,000 gal",
          "system": "imperial",
          "toBase": 0.26417205235814845
        }
      ]
    },
    {
      "dimension": "coverage",
      "baseUnit": "m2_per_l",
      "units": [
        {
          "id": "m2_per_l",
          "label": "Square meters per liter",
          "symbol": "m²/L",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "ft2_per_gal",
          "label": "Square feet per US gallon",
          "symbol": "ft²/gal",
          "system": "imperial",
          "toBase": 0.02454238674711116
        }
      ]
    },
    {
      "dimension": "density",
      "baseUnit": "kgm3",
      "units": [
        {
          "id": "kgm3",
          "label": "Kilograms per cubic meter",
          "symbol": "kg/m³",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "pcf",
          "label": "Pounds per cubic foot",
          "symbol": "pcf",
          "system": "imperial",
          "toBase": 16.018463374
        },
        {
          "id": "lbyd3",
          "label": "Pounds per cubic yard",
          "symbol": "lb/yd³",
          "system": "imperial",
          "toBase": 0.5932764213
        }
      ]
    },
    {
      "dimension": "lineardensity",
      "baseUnit": "kgm",
      "units": [
        {
          "id": "kgm",
          "label": "Kilograms per meter",
          "symbol": "kg/m",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "lbft",
          "label": "Pounds per foot",
          "symbol": "lb/ft",
          "system": "imperial",
          "toBase": 1.488163944
        }
      ]
    },
    {
      "dimension": "arealdensity",
      "baseUnit": "kgm2",
      "units": [
        {
          "id": "kgm2",
          "label": "Kilograms per square meter",
          "symbol": "kg/m²",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "lbft2",
          "label": "Pounds per square foot",
          "symbol": "lb/ft²",
          "system": "imperial",
          "toBase": 4.882427636
        }
      ]
    },
    {
      "dimension": "weight",
      "baseUnit": "kg",
      "units": [
        {
          "id": "kg",
          "label": "Kilograms",
          "symbol": "kg",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "lb",
          "label": "Pounds",
          "symbol": "lb",
          "system": "imperial",
          "toBase": 0.45359237
        },
        {
          "id": "t",
          "label": "Tonnes (metric)",
          "symbol": "t",
          "system": "metric",
          "toBase": 1000
        },
        {
          "id": "ton",
          "label": "Tons (US short)",
          "symbol": "ton",
          "system": "imperial",
          "toBase": 907.18474
        }
      ]
    },
    {
      "dimension": "pressure",
      "baseUnit": "pa",
      "units": [
        {
          "id": "pa",
          "label": "Pascals",
          "symbol": "Pa",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "kpa",
          "label": "Kilopascals",
          "symbol": "kPa",
          "system": "metric",
          "toBase": 1000
        },
        {
          "id": "mpa",
          "label": "Megapascals",
          "symbol": "MPa",
          "system": "metric",
          "toBase": 1000000
        },
        {
          "id": "psi",
          "label": "Pounds per square inch",
          "symbol": "psi",
          "system": "imperial",
          "toBase": 6894.757293168
        },
        {
          "id": "psf",
          "label": "Pounds per square foot",
          "symbol": "psf",
          "system": "imperial",
          "toBase": 47.88025898033584
        },
        {
          "id": "in_wc",
          "label": "Inches of water gauge",
          "symbol": "in. w.g.",
          "system": "imperial",
          "toBase": 249.0889083
        }
      ]
    },
    {
      "dimension": "force",
      "baseUnit": "n",
      "units": [
        {
          "id": "n",
          "label": "Newtons",
          "symbol": "N",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "kn",
          "label": "Kilonewtons",
          "symbol": "kN",
          "system": "metric",
          "toBase": 1000
        },
        {
          "id": "lbf",
          "label": "Pounds-force",
          "symbol": "lbf",
          "system": "imperial",
          "toBase": 4.4482216152605
        },
        {
          "id": "kip",
          "label": "Kips (1,000 lbf)",
          "symbol": "kip",
          "system": "imperial",
          "toBase": 4448.2216152605
        }
      ]
    },
    {
      "dimension": "fuelrate",
      "baseUnit": "lph",
      "units": [
        {
          "id": "lph",
          "label": "Litres per hour",
          "symbol": "L/hr",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "galph",
          "label": "US gallons per hour",
          "symbol": "gal/hr",
          "system": "imperial",
          "toBase": 3.785411784
        }
      ]
    },
    {
      "dimension": "thermal",
      "baseUnit": "w",
      "units": [
        {
          "id": "w",
          "label": "Watts",
          "symbol": "W",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "kw",
          "label": "Kilowatts",
          "symbol": "kW",
          "system": "metric",
          "toBase": 1000
        },
        {
          "id": "btuh",
          "label": "BTU per hour",
          "symbol": "BTU/hr",
          "system": "imperial",
          "toBase": 0.29307107017222
        },
        {
          "id": "ton_r",
          "label": "Tons of refrigeration",
          "symbol": "ton",
          "system": "imperial",
          "toBase": 3516.8528420667
        }
      ]
    },
    {
      "dimension": "tempdelta",
      "baseUnit": "c_delta",
      "units": [
        {
          "id": "c_delta",
          "label": "Celsius degrees",
          "symbol": "°C",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "f_delta",
          "label": "Fahrenheit degrees",
          "symbol": "°F",
          "system": "imperial",
          "toBase": 0.5555555555555556
        }
      ]
    },
    {
      "dimension": "temperature",
      "baseUnit": "c",
      "units": [
        {
          "id": "c",
          "label": "Celsius",
          "symbol": "°C",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "f",
          "label": "Fahrenheit",
          "symbol": "°F",
          "system": "imperial",
          "toBase": 0.5555555555555556,
          "offsetToBase": -32
        },
        {
          "id": "k",
          "label": "Kelvin",
          "symbol": "K",
          "system": "metric",
          "toBase": 1,
          "offsetToBase": -273.15
        }
      ]
    },
    {
      "dimension": "applicationrate",
      "baseUnit": "l_per_m2",
      "units": [
        {
          "id": "l_per_m2",
          "label": "Liters per square meter",
          "symbol": "L/m²",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "gal_per_yd2",
          "label": "US gallons per square yard",
          "symbol": "gal/yd²",
          "system": "imperial",
          "toBase": 4.527314814814814
        },
        {
          "id": "gal_per_ft2",
          "label": "US gallons per square foot",
          "symbol": "gal/ft²",
          "system": "imperial",
          "toBase": 40.74583333333333
        }
      ]
    },
    {
      "dimension": "unitweight",
      "baseUnit": "knm3",
      "units": [
        {
          "id": "knm3",
          "label": "Kilonewtons per cubic meter",
          "symbol": "kN/m³",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "pcf_weight",
          "label": "Pounds-force per cubic foot",
          "symbol": "pcf",
          "system": "imperial",
          "toBase": 0.1570874638466371
        }
      ]
    },
    {
      "dimension": "lineload",
      "baseUnit": "n_per_m",
      "units": [
        {
          "id": "n_per_m",
          "label": "Newtons per meter",
          "symbol": "N/m",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "kn_per_m",
          "label": "Kilonewtons per meter",
          "symbol": "kN/m",
          "system": "metric",
          "toBase": 1000
        },
        {
          "id": "lbf_per_ft",
          "label": "Pounds-force per foot",
          "symbol": "lbf/ft",
          "system": "imperial",
          "toBase": 14.593902937206362
        },
        {
          "id": "kip_per_ft",
          "label": "Kips per foot",
          "symbol": "kip/ft",
          "system": "imperial",
          "toBase": 14593.902937206361
        }
      ]
    },
    {
      "dimension": "moment",
      "baseUnit": "kn_m",
      "units": [
        {
          "id": "kn_m",
          "label": "Kilonewton-meters",
          "symbol": "kN·m",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "lbf_ft",
          "label": "Pound-force feet",
          "symbol": "lbf·ft",
          "system": "imperial",
          "toBase": 0.0013558179483314004
        },
        {
          "id": "kip_ft",
          "label": "Kip-feet",
          "symbol": "kip·ft",
          "system": "imperial",
          "toBase": 1.3558179483314003
        }
      ]
    },
    {
      "dimension": "depthrate",
      "baseUnit": "mm_per_h",
      "units": [
        {
          "id": "mm_per_h",
          "label": "Millimeters per hour",
          "symbol": "mm/h",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "in_per_h",
          "label": "Inches per hour",
          "symbol": "in/h",
          "system": "imperial",
          "toBase": 25.4
        }
      ]
    },
    {
      "dimension": "uvalue",
      "baseUnit": "w_m2k",
      "units": [
        {
          "id": "w_m2k",
          "label": "Watts per square meter kelvin",
          "symbol": "W/m²K",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "btu_h_ft2_f",
          "label": "BTU per hour square foot °F",
          "symbol": "BTU/(hr·ft²·°F)",
          "system": "imperial",
          "toBase": 5.678263341113487
        }
      ]
    },
    {
      "dimension": "rvalue",
      "baseUnit": "m2k_w",
      "units": [
        {
          "id": "m2k_w",
          "label": "Square meter kelvins per watt",
          "symbol": "m²K/W",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "h_ft2_f_btu",
          "label": "Hour square foot °F per BTU (R-value)",
          "symbol": "hr·ft²·°F/BTU",
          "system": "imperial",
          "toBase": 0.17611018368230585
        }
      ]
    },
    {
      "dimension": "conductivity",
      "baseUnit": "w_mk",
      "units": [
        {
          "id": "w_mk",
          "label": "Watts per meter kelvin",
          "symbol": "W/m·K",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "btu_in_h_ft2_f",
          "label": "BTU inch per hour square foot °F",
          "symbol": "BTU·in/hr·ft²·°F",
          "system": "imperial",
          "toBase": 0.14422788886428256
        }
      ]
    },
    {
      "dimension": "lineartransmittance",
      "baseUnit": "psi_w_mk",
      "units": [
        {
          "id": "psi_w_mk",
          "label": "Watts per meter kelvin (ψ)",
          "symbol": "W/m·K",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "psi_btu_h_ft_f",
          "label": "BTU per hour foot °F (ψ)",
          "symbol": "BTU/hr·ft·°F",
          "system": "imperial",
          "toBase": 1.7307346663713912
        }
      ]
    },
    {
      "dimension": "heatloss",
      "baseUnit": "w_k",
      "units": [
        {
          "id": "w_k",
          "label": "Watts per kelvin",
          "symbol": "W/K",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "btu_h_f",
          "label": "BTU per hour °F",
          "symbol": "BTU/hr·°F",
          "system": "imperial",
          "toBase": 0.52752792631
        }
      ]
    },
    {
      "dimension": "airpermeability",
      "baseUnit": "m3_h_m2",
      "units": [
        {
          "id": "m3_h_m2",
          "label": "Cubic meters per hour per square meter",
          "symbol": "m³/h·m²",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "cfm_ft2",
          "label": "Cubic feet per minute per square foot",
          "symbol": "CFM/ft²",
          "system": "imperial",
          "toBase": 18.288
        }
      ]
    },
    {
      "dimension": "illuminance",
      "baseUnit": "lux",
      "units": [
        {
          "id": "lux",
          "label": "Lux",
          "symbol": "lx",
          "system": "metric",
          "toBase": 1
        },
        {
          "id": "fc",
          "label": "Foot-candles",
          "symbol": "fc",
          "system": "imperial",
          "toBase": 10.763910416709722
        }
      ]
    }
  ]
}