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The following lists give metric (or SI) equivalents of non-metric units. Each row specifies the name of the unit, the abbreviation(s) of the unit, and the metric equivalent. The metric measures are given using the standardized abbreviations:
µm micrometre; 1 mm = 1000 µm; note: µ often replaced by letter u mm millimetre; 1 m = 1000 mm m metre (US spelling: meter) km kilometre (1000 m) mm² square millimetre; 1 m² = 1 000 000 mm² cm² square centimetre; 1 m² = 10 000 cm² m² square metre a are (100 m²) km² square kilometre (1 000 000 m²) ml millilitre; 1 l = 1000 ml; equivalent to cubic centimetre (cm³) l litre (US spelling: liter); 1 m³ = 1000 l; equiv. to cubic decimetre m³ cubic metre mg milligramme; 1 g = 1000 mg g gramme (US spelling: gram) kg kilogramme (1000 g) Mg megagramme (1000 kg); equivalent to metric ton (t)
(didot) point 376 µm pica em 4.512 mm inch in., " 25.40 mm foot ft. 304.80 mm yard yd. 914.40 mm (statute) mile mi. 1.609344 km nautical mile nm 1.852 km
square inch sq.in. 645.2 mm² square foot sq.ft. 930 cm² square yard sq.yd. 0.836 m² acre 40.469 a claim 59.5 a square mile sq.mi. 2.590 km²
cubic inch cu.in. 16.387 ml fluid ounce oz.fl., fl.oz. 29.57 ml imperial pint imp.pt. 568 ml US. quart US.qt. 946 ml imperial quart imp.qt. 1.137 l US. gallon US.gal. 3.785 l imperial gallon imp.gal. 4.546 l cubic foot cu.ft. 28 l US. bushel 35.239 l imperial bushel 36.369 l barrel 159 l quarter qr. 281.912 l cubic yard cu.yd. 765 l register ton RT 2.832 m³
grain gr. 65 mg pennyweight dwt. 1.555 g avoirdupois ounce oz. 28.35 g troy ounce tr.oz. 31.1035 g fine ounce 31.2 g metric carat 200 mg (avoirdupois) pound lb. 453.592 g stone st. 6.350 kg quarter qr. 12.701 kg cental 45.359 kg US. hundredweight 45.359 kg hundredweight cwt. 50.802 kg short ton sh.tn. 907.185 kg long ton, gross ton l.tn. 1.016 Mg
British thermal unit Btu 1.0548 kJ therm 105.48 MJ UK horsepower hp 745.7 W Fahrenheit degree °F 555.556 mKNote: The zero point of the Fahrenheit scale is different from absolute zero temperature. Therefore, the above-mentioned rule applies as such only to temperature differences. Given a temperature measurement F in °F, the corresponding quantity in kelvins is 0.5555556×F + 255.3722, and in the Celsius or centigrade scale it is (5/9)×(F-32).