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Conversion charts for everyday units

The numbers people look up most, in one place. Every value here is computed from the exact definition of the unit, not copied from another chart.

Centimetres to inches

1 cm = 0.393701 in  |  1 in = 2.54 cm exactly
CM to inches
CentimetresInches
1 cm0.39 in
2 cm0.79 in
5 cm1.97 in
10 cm3.94 in
15 cm5.91 in
20 cm7.87 in
25 cm9.84 in
30 cm11.81 in
50 cm19.69 in
75 cm29.53 in
100 cm39.37 in

Full guide, including fractional inches and heights →

Kilograms to pounds

1 kg = 2.204623 lb  |  1 lb = 0.45359237 kg exactly
KG to lbs
KilogramsPounds
1 kg2.20 lb
5 kg11.02 lb
10 kg22.05 lb
25 kg55.12 lb
50 kg110.23 lb
60 kg132.28 lb
70 kg154.32 lb
80 kg176.37 lb
90 kg198.42 lb
100 kg220.46 lb

Full guide, including stones and mass vs weight →

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Celsius to Fahrenheit

°F = (°C × 9/5) + 32
Celsius to Fahrenheit
CelsiusFahrenheit
-40°C-40.0°F
-18°C-0.4°F
0°C32.0°F
10°C50.0°F
20°C68.0°F
25°C77.0°F
30°C86.0°F
37°C98.6°F
100°C212.0°F
180°C356.0°F
200°C392.0°F
220°C428.0°F

Full guide, including gas marks and why differences convert differently →

MPH to km/h

1 mph = 1.609344 km/h exactly
MPH to km/h
MPHKM/H
10 mph16.1 km/h
20 mph32.2 km/h
30 mph48.3 km/h
40 mph64.4 km/h
50 mph80.5 km/h
60 mph96.6 km/h
65 mph104.6 km/h
70 mph112.7 km/h
80 mph128.7 km/h
100 mph160.9 km/h

Full guide, including knots and Mach →

Litres to gallons

1 L = 0.264172 US gal = 0.219969 imperial gal
Litres to gallons — note the two columns differ by 20%
LitresGallons (US)Gallons (UK)
1 L0.260.22
5 L1.321.10
10 L2.642.20
20 L5.284.40
40 L10.578.80
50 L13.2111.00
60 L15.8513.20
100 L26.4222.00

Why the same unit name has two sizes →

Area

Area equivalents
UnitEquals
1 m²10.7639 ft²
1 acre43,560 ft²
1 hectare2.4711 acres = 10,000 m²
1 mi²640 acres = 2.59 km²
US football field, incl. end zones57,600 ft² = 1.32 acres

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