Conversions
Convert between metric and imperial units instantly — no sign-up, no ads, no approximations. Our unit converter covers the most common measurement categories used in science, engineering, everyday life, and international travel: length, weight, volume, temperature, area, speed, pressure, energy, and more.
All conversion factors are based on internationally recognized standards: the International System of Units (SI) maintained by the BIPM, and the international yard and pound agreement of 1959 for US customary and imperial units. Select a category below to browse all available conversions.
Length
Inches → Centimeters1 in = 2.54 cmCentimeters → Inches1 cm = 0.393701 inFeet → Meters1 ft = 0.3048 mMeters → Feet1 m = 3.2808 ftMiles → Kilometers1 mi = 1.6093 kmKilometers → Miles1 km = 0.621373 miYards → Meters1 yd = 0.9144 mMeters → Yards1 m = 1.0936 ydMillimeters → Inches1 mm = 0.0393701 inInches → Millimeters1 in = 25.4 mmCentimeters → Millimeters1 cm = 10 mmMillimeters → Centimeters1 mm = 0.1 cmCentimeters → Meters1 cm = 0.01 mMeters → Centimeters1 m = 100 cmKilometers → Meters1 km = 1000.00 mMeters → Kilometers1 m = 0.001 kmFeet → Inches1 ft = 12 inInches → Feet1 in = 0.0833333 ftFeet → Centimeters1 ft = 30.48 cmCentimeters → Feet1 cm = 0.0328084 ftFeet → Millimeters1 ft = 304.8 mmMiles → Feet1 mi = 5280.00 ftFeet → Miles1 ft = 0.000189394 miMiles → Yards1 mi = 1760.00 ydInches → Yards1 in = 0.0277778 ydYards → Feet1 yd = 3 ftFeet → Yards1 ft = 0.333333 ydCentimeters → Kilometers1 cm = 0.00001 km
Weight & Mass
Kilograms → Pounds1 kg = 2.2046 lbPounds → Kilograms1 lb = 0.453592 kgOunces → Grams1 oz = 28.3495 gGrams → Ounces1 g = 0.035274 ozKilograms → Grams1 kg = 1000.00 gGrams → Kilograms1 g = 0.001 kgKilograms → Ounces1 kg = 35.274 ozOunces → Kilograms1 oz = 0.0283495 kgPounds → Ounces1 lb = 16 ozOunces → Pounds1 oz = 0.0625 lbPounds → Grams1 lb = 453.592 gGrams → Pounds1 g = 0.00220462 lbKilograms → Metric Tons1 kg = 0.001 tMetric Tons → Kilograms1 t = 1000.00 kgPounds → Metric Tons1 lb = 0.000453592 tMetric Tons → Pounds1 t = 2204.62 lbPounds → Stones1 lb = 0.0714286 stStones → Pounds1 st = 14 lbStones → Kilograms1 st = 6.3503 kgKilograms → Stones1 kg = 0.157473 stMilligrams → Grams1 mg = 0.001 gGrams → Milligrams1 g = 1000.00 mgMilligrams → Kilograms1 mg = 0.000001 kgKilograms → Milligrams1 kg = 1000000.00 mg
Volume
Gallons (US) → Liters1 gal = 3.7854 LLiters → Gallons (US)1 L = 0.264172 galFluid Ounces → Milliliters1 fl oz = 29.5735 mlMilliliters → Fluid Ounces1 ml = 0.0338141 fl ozLiters → Milliliters1 L = 1000.00 mlMilliliters → Liters1 ml = 0.001 LGallons (US) → Quarts1 gal = 4 qtQuarts → Gallons (US)1 qt = 0.25 galQuarts → Liters1 qt = 0.946353 LLiters → Quarts1 L = 1.0567 qtPints → Liters1 pt = 0.473176 LLiters → Pints1 L = 2.1134 ptGallons (US) → Milliliters1 gal = 3785.41 mlGallons (US) → Pints1 gal = 8 ptPints → Milliliters1 pt = 473.176 mlFluid Ounces → Liters1 fl oz = 0.0295735 L
Temperature
Energy
Joules → Calories1 J = 0.239006 calCalories → Joules1 cal = 4.184 JKilocalories → Calories1 kcal = 1000.00 calCalories → Kilocalories1 cal = 0.001 kcalJoules → Kilojoules1 J = 0.001 kJKilojoules → Joules1 kJ = 1000.00 JKilojoules → Kilocalories1 kJ = 0.239006 kcalKilocalories → Kilojoules1 kcal = 4.184 kJKilowatt-hours → Joules1 kWh = 3600000.00 JJoules → Kilowatt-hours1 J = 2.77778e-7 kWhKilowatt-hours → BTU1 kWh = 3412.14 BTUBTU → Kilowatt-hours1 BTU = 0.000293071 kWhBTU → Joules1 BTU = 1055.06 JJoules → BTU1 J = 0.000947813 BTUBTU → Kilojoules1 BTU = 1.0551 kJKilojoules → BTU1 kJ = 0.947813 BTUKilocalories → Joules1 kcal = 4184.00 JJoules → Kilocalories1 J = 0.000239006 kcal
Power
Watts → Kilowatts1 W = 0.001 kWKilowatts → Watts1 kW = 1000.00 WHorsepower → Kilowatts1 hp = 0.7457 kWKilowatts → Horsepower1 kW = 1.341 hpHorsepower → Watts1 hp = 745.7 WWatts → Horsepower1 W = 0.00134102 hpBTU/hour → Watts1 BTU/h = 0.29307 WWatts → BTU/hour1 W = 3.4122 BTU/hBTU/hour → Kilowatts1 BTU/h = 0.00029307 kWKilowatts → BTU/hour1 kW = 3412.15 BTU/h
Area
Square Feet → Square Meters1 ft² = 0.092903 m²Square Meters → Square Feet1 m² = 10.7639 ft²Acres → Hectares1 ac = 0.404686 haHectares → Acres1 ha = 2.4711 acSquare Kilometers → Square Miles1 km² = 0.386102 mi²Square Miles → Square Kilometers1 mi² = 2.59 km²Acres → Square Feet1 ac = 43560.00 ft²Square Feet → Acres1 ft² = 0.0000229568 acHectares → Square Meters1 ha = 10000.00 m²Square Meters → Hectares1 m² = 0.0001 haAcres → Square Meters1 ac = 4046.86 m²Square Meters → Acres1 m² = 0.000247105 ac
Speed
Pressure
Bar → PSI1 bar = 14.5038 psiPSI → Bar1 psi = 0.0689474 barAtmospheres → Pascals1 atm = 101325.00 PaPascals → Atmospheres1 Pa = 0.00000986923 atmAtmospheres → Bar1 atm = 1.0132 barBar → Atmospheres1 bar = 0.986923 atmAtmospheres → PSI1 atm = 14.696 psiPSI → Atmospheres1 psi = 0.0680457 atmPascals → Bar1 Pa = 0.00001 barBar → Pascals1 bar = 100000.00 Pa
Data Storage
Kilobytes → Megabytes1 KB = 0.000976563 MBMegabytes → Kilobytes1 MB = 1024.00 KBMegabytes → Gigabytes1 MB = 0.000976563 GBGigabytes → Megabytes1 GB = 1024.00 MBGigabytes → Terabytes1 GB = 0.000976563 TBTerabytes → Gigabytes1 TB = 1024.00 GBBytes → Kilobytes1 B = 0.000976563 KBKilobytes → Bytes1 KB = 1024.00 BBytes → Megabytes1 B = 9.53674e-7 MBMegabytes → Bytes1 MB = 1048576.00 B