Skip to content

Tools

Unit converter

Length, weight, volume, temperature, area, energy and speed — with the exact conversion factors, and both US and imperial measures where they differ.

Measurement type

1 cm = 0.393701 in

Working on a body measurement? Every calculator has its own metric and US toggle — start with the BMI calculator or browse all calculators.

Conversion reference

Every figure below is computed from the same factors the converter above uses, so the two can never disagree.
Common length conversions
FromEquals
1 in2.54 cm
1 ft30.48 cm
1 yd0.9144 m
1 mi1.60934 km
1 cm0.393701 in
1 m3.28084 ft
1 km0.621371 mi
Common weight conversions
FromEquals
1 lb0.453592 kg
1 oz28.3495 g
1 st6.35029 kg
1 kg2.20462 lb
1 g0.035274 oz
Common volume conversions
FromEquals
1 fl oz29.5735 mL
1 cup240 mL
1 pt473.176 mL
1 qt0.946353 L
1 gal3.78541 L
1 gal4.54609 L
1 L33.814 fl oz
1 L4.16667 cup
Temperature reference points
CelsiusFahrenheitKelvin
0 °C32 °F273.15 K
20 °C68 °F293.15 K
37 °C98.6 °F310.15 K
100 °C212 °F373.15 K
Common area conversions
FromEquals
1 ft²0.092903 m²
1 yd²0.836127 m²
1 ac4046.86 m²
1 m²10.7639 ft²
1 ha2.47105 ac
Common energy conversions
FromEquals
1 kcal4.184 kJ
1 kJ0.239006 kcal
1 kcal1.16222 Wh
Common speed conversions
FromEquals
1 mph1.60934 km/h
1 km/h0.621371 mph
1 kn1.852 km/h
1 m/s3.6 km/h

Frequently asked questions

The US legal cup is exactly 240 mL and is the one used on nutrition labels, so it is what a food package means. The US customary cup is 236.588 mL and is the one a recipe means. The difference is about 1.4% — small in a single cup, but enough to shift a daily fluid target by most of a glass.