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Unit conversion tables

Every value below is worked out by our converters from exact definitions (NIST Special Publication 811 and the legal definitions of each unit), rounded for display. For any other value, open the converter.

Last checked: 15 October 2026. Worked out by the calculators below, not typed in by hand.

Length

FromEquals
1 km3,280.839895 ft = 0.621371 mi = 1,000 m
1 mi1.609344 km = 5,280 ft
1 m3.28084 ft = 39.370079 in
1 ft30.48 cm = 12 in
1 in2.54 cm = 25.4 mm
1 yd0.9144 m = 3 ft

Work out your own figure: Length Converter →

Weight

FromEquals
1 kg2.204623 lb = 35.273962 oz
1 lb0.453592 kg = 453.59237 g
1 oz28.349523 g
1 tola11.663804 g
1 st6.350293 kg = 14 lb
1 oz t31.103477 g

Work out your own figure: Weight Converter →

Volume and cooking

FromEquals
1 gal3.785412 l
1 imp gal4.54609 l
1 l0.264172 gal = 0.219969 imp gal
1 cup236.588237 ml
1 tbsp14.786765 ml
1 tsp4.928922 ml
1 fl oz29.57353 ml

Work out your own figure: Volume and Cooking Converter →

Temperature (including body temperature)

CelsiusFahrenheitKelvin
-40 °C-40 °F233.15 K
0 °C32 °F273.15 K
20 °C68 °F293.15 K
36 °C96.8 °F309.15 K
36.5 °C97.7 °F309.65 K
37 °C98.6 °F310.15 K
37.5 °C99.5 °F310.65 K
38 °C100.4 °F311.15 K
39 °C102.2 °F312.15 K
40 °C104 °F313.15 K
100 °C212 °F373.15 K

Work out your own figure: Temperature Converter →

Fuel economy

km per litreLitres per 100 kmmpg (US)mpg (UK)
8 km/L12.518.8222.6
10 km/L1023.5228.25
12 km/L8.3328.2333.9
15 km/L6.6735.2842.37
18 km/L5.5642.3450.85
20 km/L547.0456.5
25 km/L458.870.62

Work out your own figure: Fuel Economy Converter →

Fuel price: per litre to per gallon

Price per litrePer US gallonPer UK gallon
13.794.55
1.55.686.82
1.86.818.18
27.579.09
250946.351,136.52
3001,135.621,363.83

Any currency. A US gallon is 3.785412 litres and a UK gallon 4.54609 litres, so multiply the price per litre by those numbers.

Work out your own figure: Volume and Cooking Converter →

Area

FromEquals
1 ac43,560 ft² = 4,046.856422 m² = 0.404686 ha
1 ha2.471054 ac = 10,000 m²
1 m²10.76391 ft²
1 ft²0.092903 m²
1 km²0.386102 mi²

Work out your own figure: Area Converter →

Speed

FromEquals
1 km/h0.621371 mph = 0.277778 m/s
100 km/h62.137119 mph
1 mph1.609344 km/h
1 kn1.852 km/h = 1.150779 mph
1 m/s3.6 km/h

Work out your own figure: Speed Converter →

Pressure

FromEquals
1 bar14.503774 psi = 100 kPa
1 atm14.695949 psi = 1.01325 bar
32 psi2.206322 bar = 220.632233 kPa
1 psi6.894757 kPa

Work out your own figure: Pressure Converter →

Power and air conditioning

FromEquals
1 TR12,000 BTU/h = 3.516853 kW
1.5 TR18,000 BTU/h = 5.275279 kW
1 hp0.7457 kW = 745.699872 W
1 kW1.341022 hp = 3,412.141633 BTU/h

Work out your own figure: Power Converter →

Data storage

FromEquals
1 GB1,000 MB = 0.931323 GiB
1 TB1,000 GB = 0.909495 TiB
1 GiB1,024 MiB = 1.073742 GB
1 B8 bit

Work out your own figure: Data Storage Converter →

Calculators behind these tables

Length Convertermm, cm, m, km, inches, feet, yards, milesWeight Converterkg, grams, pounds, ounces, stone, troy ounces, tolaVolume and Cooking Converterml, litres, cups, tablespoons, teaspoons, fl oz, gallonsTemperature ConverterCelsius, Fahrenheit and KelvinFuel Economy Converterkm per litre, litres per 100 km and miles per gallon (US and UK)Area ConverterSquare feet, square metres, square yards, acres, hectaresSpeed Converterkm/h, mph, m/s, knots, ft/sPressure ConverterPa, kPa, bar, psi, atm, mmHg, inHg and torrPower ConverterW, kW, horsepower, BTU/h and tons of cooling (AC)Data Storage ConverterBits, bytes, KB, MB, GB, TB and KiB, MiB, GiB, TiB

Sources and checks

Last checked: 15 October 2026. Each table is rebuilt from the calculators' tested code on every release.

Results are estimates for information only and are not financial, tax or legal advice. Check important figures with a qualified professional before you act on them.

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