第一話 · 20 categories · 137 units
Unit converter
Exact factors, the arithmetic printed so you can check it, and every unit in the category shown at once. US and Imperial measures are kept apart, because a converter that offers one “gallon” is silently wrong for half the world.
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scale · base kilogram
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Every category
MassKilograms, pounds, stone, ounces and both tons.
TemperatureCelsius, Fahrenheit, kelvin and Rankine.
LengthMetric, imperial, and the nautical mile.
VolumeLitres, and US and Imperial measures kept apart.
Speedkm/h, mph, knots and metres per second.
EnergyJoules, calories, watt-hours and BTU.
AreaSquare metres, feet, acres and hectares.
TimeSeconds through years, with the year defined.
DataDecimal MB and binary MiB, kept apart.
Data rateMegabits per second versus megabytes per second.
PressureBar, psi, atmospheres and millimetres of mercury.
PowerWatts, and the two different horsepowers.
AngleDegrees, radians, gradians and turns.
FrequencyHertz, kilohertz, megahertz and RPM.
ForceNewtons, kilogram-force and pounds-force.
TorqueNewton-metres and pound-feet.
Fuel economympg and L/100 km — where bigger means worse.
Densitykg/m³, g/cm³ and pounds per cubic foot.
CookingSpoons and cups, with the country stated.
IlluminanceLux and foot-candles.
Popular conversions
920 unit pairs each have their own page with the factor, the formula and a worked table.
kg → lblb → kgg → ozst → kglb → st°C → °F°F → °C°C → Kcm → inin → cmft → mm → ftkm → mimi → kmL → US galUS gal → LmL → US fl ozimp gal → Lkm/h → mphmph → km/hkn → km/hm² → ft²acre → haha → acreGB → GiBTB → TiBMB → kBMbit/s → MB/sMB/s → Mbit/sbar → psipsi → barkPa → psihp → kWkW → hpPS → hpkcal → kJkWh → Jh → mind → h° → radrad → °US mpg → L/100kmL/100km → US mpgUK mpg → US mpgUS cup → mLUS tbsp → mLUS tsp → mLrpm → Hzkgf → Nlbf·ft → N·mg/cm³ → kg/m³fc → lx