Unit Conversion Tables

One page per conversion: live calculator, formula and table

Each page below focuses on a single conversion in both directions, with the exact factor, worked examples, a table of common values and answers to frequent questions. Pick a pair, or use the full unit converter for any other units.

All factors follow the international definitions of the units (for example, 1 inch = 2.54 cm exactly). Volume pages use US customary units (gallon, fluid ounce, cup) unless stated otherwise.

Length

Centimeter → Inch 1 cm = 0.3937 in Inch → Centimeter 1 in = 2.54 cm Millimeter → Inch 1 mm = 0.0394 in Inch → Millimeter 1 in = 25.4 mm Meter → Foot 1 m = 3.2808 ft Foot → Meter 1 ft = 0.3048 m Kilometer → Mile 1 km = 0.6214 mi Mile → Kilometer 1 mi = 1.6093 km Foot → Centimeter 1 ft = 30.48 cm Centimeter → Foot 1 cm = 0.0328 ft Yard → Meter 1 yd = 0.9144 m Meter → Yard 1 m = 1.0936 yd Inch → Foot 1 in = 0.0833 ft Foot → Inch 1 ft = 12 in Nautical mile → Kilometer 1 nmi = 1.852 km Kilometer → Nautical mile 1 km = 0.54 nmi

Weight

Kilogram → Pound 1 kg = 2.2046 lb Pound → Kilogram 1 lb = 0.4536 kg Gram → Ounce 1 g = 0.0353 oz Ounce → Gram 1 oz = 28.35 g Stone → Kilogram 1 st = 6.3503 kg Kilogram → Stone 1 kg = 0.1575 st Pound → Ounce 1 lb = 16 oz Ounce → Pound 1 oz = 0.0625 lb

Temperature

Celsius → Fahrenheit °F = °C × 9/5 + 32 Fahrenheit → Celsius °C = (°F − 32) × 5/9 Celsius → Kelvin K = °C + 273.15 Kelvin → Celsius °C = K − 273.15 Fahrenheit → Kelvin K = (°F − 32) × 5/9 + 273.15 Kelvin → Fahrenheit °F = (K − 273.15) × 9/5 + 32

Volume

Liter → Gallon (US) 1 L = 0.2642 gal Gallon (US) → Liter 1 gal = 3.7854 L Milliliter → Fluid ounce (US) 1 mL = 0.0338 fl oz Fluid ounce (US) → Milliliter 1 fl oz = 29.574 mL Cup (US) → Milliliter 1 cup = 236.59 mL Milliliter → Cup (US) 1 mL = 0.00423 cup Quart (US) → Liter 1 qt = 0.9464 L Liter → Quart (US) 1 L = 1.0567 qt Cubic meter → Liter 1 m³ = 1,000 L Liter → Cubic meter 1 L = 0.001 m³ Cubic meter → Cubic foot 1 m³ = 35.315 ft³ Cubic foot → Cubic meter 1 ft³ = 0.0283 m³

Speed

Kilometer per hour → Mile per hour 1 km/h = 0.6214 mph Mile per hour → Kilometer per hour 1 mph = 1.6093 km/h Knot → Kilometer per hour 1 kn = 1.852 km/h Kilometer per hour → Knot 1 km/h = 0.54 kn Meter per second → Kilometer per hour 1 m/s = 3.6 km/h Kilometer per hour → Meter per second 1 km/h = 0.2778 m/s

Area

Square meter → Square foot 1 m² = 10.764 ft² Square foot → Square meter 1 ft² = 0.0929 m² Acre → Hectare 1 ac = 0.4047 ha Hectare → Acre 1 ha = 2.4711 ac

Pressure

PSI → Bar 1 psi = 0.0689 bar Bar → PSI 1 bar = 14.504 psi Bar → Atmosphere 1 bar = 0.9869 atm Atmosphere → Bar 1 atm = 1.0133 bar

Energy

Kilocalorie → Kilojoule 1 kcal = 4.184 kJ Kilojoule → Kilocalorie 1 kJ = 0.239 kcal Kilowatt-hour → Kilojoule 1 kWh = 3,600 kJ Kilojoule → Kilowatt-hour 1 kJ = 0.000278 kWh

Power

Horsepower → Kilowatt 1 hp = 0.7457 kW Kilowatt → Horsepower 1 kW = 1.341 hp Metric horsepower (PS) → Kilowatt 1 PS = 0.7355 kW Kilowatt → Metric horsepower (PS) 1 kW = 1.3596 PS

Fuel economy

Liters per 100 km → Miles per gallon (US) mpg = 235.21 ÷ L/100 km Miles per gallon (US) → Liters per 100 km L/100 km = 235.21 ÷ mpg Kilometers per liter → Liters per 100 km L/100 km = 100 ÷ km/L Liters per 100 km → Kilometers per liter km/L = 100 ÷ L/100 km Miles per gallon (US) → Kilometers per liter 1 mpg = 0.4251 km/L Kilometers per liter → Miles per gallon (US) 1 km/L = 2.3521 mpg
Open the unit converter 13 categories, both directions: length, weight, temperature, area, volume, speed, pressure, energy, power, fuel economy, time, data, ratio