Measurement Converters
39 live calculators · free, instant & privateLength converterMetres, feet, inches and miles with exact factors — eight units at once.Open calculator →Weight converterkg, pounds, stone and ounces — including the stone-and-pounds split.Open calculator →Temperature converterCelsius, Fahrenheit and Kelvin with the formula shown each time.Open calculator →Volume converterLitres, gallons, cups and pints — US and UK measures kept separate.Open calculator →Area converterSquare feet, metres, acres and hectares with exact factors.Open calculator →Speed convertermph, km/h, knots and m/s — road, sea and air in one place.Open calculator →cm to inches converterExact 2.54 cm/in with tape-measure fractionsOpen calculator →mm to inches converterMillimetres to inches with 1/64 fractions and thouOpen calculator →Meters to feet converterMetres to feet and inches, exact 0.3048 m/ftOpen calculator →km to miles converterKilometres to miles plus running pace conversionOpen calculator →Height converterFeet and inches to cm and backOpen calculator →kg to lbs converterExact 0.45359237 kg/lb, both directionsOpen calculator →Stone to pounds converterStone and pounds to kg and lbOpen calculator →Grams to ounces converterAvoirdupois and troy ounces kept separateOpen calculator →Celsius to Fahrenheit converterCelsius, Fahrenheit and KelvinOpen calculator →Liters to gallons converterUS and imperial gallons shown separatelyOpen calculator →yards to meters converterExact 0.9144 m/yd, both directionsOpen calculator →inches to feet converter12 in/ft exact, feet-and-inches splitOpen calculator →feet to cm converterExact 30.48 cm/ft, both directionsOpen calculator →nautical miles to miles converterExact 1,852 m nautical mile; 1.150779 statute miOpen calculator →pounds to ounces converter16 oz/lb exact, avoirdupoisOpen calculator →tons to pounds converterUS short ton 2,000 lb; shows tonne and long tonOpen calculator →grams to kilograms converter1,000 g/kg, with lb and oz alongsideOpen calculator →milligrams to grams converter1,000 mg/g, with mcg alongsideOpen calculator →kelvin to celsius converter°C = K − 273.15 exact; shows °F and °ROpen calculator →ml to oz converterUS fl oz 29.5735 ml exact; shows UK fl ozOpen calculator →quarts to liters converterUS liquid quart 0.946352946 L exact; shows imperial quartOpen calculator →cubic feet to gallons converter1 ft³ = 7.480519 US gal exact (1,728 in³ / 231 in³)Open calculator →pints to liters converterUS liquid pint 0.473176473 L exact; shows 0.56826 L imperial pintOpen calculator →square feet to square meters converterExact 0.09290304 m²/ft², both directionsOpen calculator →acres to square feet converter43,560 ft²/acre exactOpen calculator →hectares to acres converter1 ha = 2.47105381 acres (exact via 4,046.8564224 m² acre)Open calculator →mph to kph converterExact 1.609344 km/h per mphOpen calculator →knots to mph converter1 kn = 1.852 km/h exact = 1.150779 mphOpen calculator →psi to bar converter1 psi = 6.894757 kPa; 1 bar = 100 kPa = 14.50377 psiOpen calculator →BTU to kWh converter1 BTU (IT) = 1,055.05585262 J; 1 kWh = 3,412.14 BTUOpen calculator →hp to kW converter1 hp (mechanical) = 745.69987 W; 1 PS = 735.49875 WOpen calculator →joules to calories converter1 cal (thermochemical) = 4.184 J exact; kcal = food CalorieOpen calculator →mpg to L/100km converterL/100km = 235.214583 ÷ US mpg; UK mpg = US mpg × 1.200950Open calculator →
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Related conversion calculators
From the other conversion sub-categories — same engine, same privacy.
Cooking conversion calculatorCups to grams using each ingredient's real density, plus oven temperatures.Cooking →Data storage converterBytes to GB and GiB — including why your drive looks smaller than advertised.Digital →Unit converter calculatorLength, weight, temperature, volume and area — exact defined factors.Conversion →Grams to cups converterGrams to cups by ingredient, answered as a real measuring-cup fraction.Cooking →Number Base calculatorBinary, octal, hex, any base 2-36, two's complementDigital →cups to ml converterUS customary cup 236.588 ml; shows 250 ml metric cupCooking →
Guides for measurement
Worked examples and the reasoning behind these calculators. Browse all guides →
About these calculators
These converters are being built for the cases where rounding matters — engineering tolerances, recipe scaling, medication weights — so they use exact conversion factors and let you control the number of decimal places rather than silently truncating.
Temperature gets its own treatment because it is the one conversion that is not a simple multiplication: Celsius, Fahrenheit and Kelvin each have a different zero point. In the meantime, the all-in-one unit converter already covers the common cases.
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Every category, same promise: runs in your browser, shows its math, never sees your numbers.