Unit conversions, done properly
19 categories, 110 units and 598 conversion pairs. Every answer shows the exact factor it came from — and the arithmetic, so you can check it.
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| Conversion | Result |
|---|---|
| cm to in | 1 cm = 0.39370079 in |
| in to cm | 1 in = 2.54 cm |
| kg to lb | 1 kg = 2.204623 lb |
| lb to kg | 1 lb = 0.45359237 kg |
| cup to floz | 1 cup = 8 floz |
| gal to floz | 1 gal = 128 floz |
| °C to °F | 1 °C = 33.8 °F |
| °F to °C | 1 °F = -17.222222 °C |
| sq ft to m² | 1 sq ft = 0.09290304 m² |
| m² to sq ft | 1 m² = 10.76391 sq ft |
| mph to km/h | 1 mph = 1.609344 km/h |
| km/h to mph | 1 km/h = 0.62137119 mph |
| min to h | 1 min = 0.01666667 h |
| h to min | 1 h = 60 min |
| GB to MB | 1 GB = 1,000 MB |
| MB to GB | 1 MB = 0.001 GB |
| psi to bar | 1 psi = 0.06894757 bar |
| bar to psi | 1 bar = 14.503774 psi |
All 19 categories
Length Converter
Millimeters to miles — every length unit in one converter, with the exact definition each factor comes from.…
cm to inin to cmmm to inWeight and Mass Converter
Kilograms, pounds, ounces, stone and tonnes — converted with exact definitions and the arithmetic shown.…
kg to lblb to kgkg to stVolume and Cooking Converter
Cups, tablespoons, teaspoons, fluid ounces, pints, quarts and gallons against milliliters — with a fraction …
cup to flozgal to flozqt to cupTemperature Converter
Celsius, Fahrenheit and kelvin — the two formulas and every reference point that matters.…
°C to °F°F to °C°C to KArea Converter
Square feet, square meters, acres and hectares for homes, land and farms.…
sq ft to m²m² to sq ftacre to haSpeed Converter
Miles per hour, kilometers per hour, knots and meters per second.…
mph to km/hkm/h to mphkn to km/hTime Converter
Seconds, minutes, hours, days and weeks with worked examples.…
min to hh to mind to wkData Storage Converter
Decimal (kB, MB, GB, TB) and binary (KiB, MiB, GiB) storage units, clearly separated — the reason a 1 TB dri…
GB to MBMB to GBTB to GBPressure Converter
Tire, weather and engineering pressure — psi, bar, kPa, atm, mmHg and inHg.…
psi to barbar to psikPa to psiEnergy Converter
Food calories, kilojoules, watt-hours, kilowatt-hours and BTUs.…
kcal to kJkJ to kcalkWh to kJTorque Converter
Newton-meters, pound-feet, inch-pounds and kilogram-force meters for engines and torque wrenches.…
Nm to ft-lbft-lb to Nmin-lb to ft-lbFuel Economy Converter
mpg, UK mpg, km/L and L/100km — including the reciprocal relationship people get wrong.…
mpg to L/100kmL/100km to mpgmpg to km/LMedical Dose Converter
Micrograms, milligrams and grams — the 1000× steps where a decimal slip matters.…
mcg to mgmg to mcgmg to gPower Converter
Watts, kilowatts, megawatts, mechanical and metric horsepower, and BTU per hour.…
kW to hphp to kWMW to kWData Transfer Rate Converter
Mbps, MB/s, Gbps and GB/s — the 8× trap between bits and bytes.…
Mbps to MB/sMB/s to MbpsGbps to MB/sBlood Glucose Converter
mmol/L and mg/dL for glucose readings, with the molar-mass factor stated openly.…
mmol/L to mg/dLmg/dL to mmol/LAngle Converter
Degrees, radians, gradians, turns, arcminutes and arcseconds.…
° to radrad to °grad to °Flow Rate Converter
L/min, L/s, m³/h, cfm and gpm for pumps, ventilation and plumbing.…
cfm to m³/hL/min to gpmm³/h to cfmFrequency Converter
Hertz, kilohertz, megahertz, gigahertz and RPM — frequency in radio, processors, monitors and motors, with t…
GHz to MHzMHz to kHzkHz to HzHandy converters
Height converter
cm ↔ feet and inches, the way people actually say it (175 cm = 5'9").
Cooking converter
Cups, tablespoons, teaspoons and milliliters, in fractions not decimals.
Body weight converter
Kilograms, pounds and stone in one table — gym, clinic and UK scales.