Length

Metric			US or Imperial
1 millimeter [mm]			0.03937 in
1 centimeter [cm]	10 mm		0.3937 in
1 meter [m]	100 cm		1.0936 yd
1 kilometer [km]	1000 m		0.6214 mile

US or Imperial			Metric
1 inch [in]			2.54 cm
1 foot [ft]	12 in		0.3048 m
1 yard [yd]	3 ft		0.9144 m
1 mile	1760 yd		1.6093 km
1 int nautical mile	2025.4 yd		1.852 km

back to top

Area

Metric			US or Imperial
1 sq cm [cm2]	100 mm2		0.1550 in2
1 sq m [m2]	10,000 cm2		1.1960 yd2
1 hectare [ha]	10,000 m2		2.4711 acres
1 sq km [km2]	100 ha		0.3861 mile2

US or Imperial			Metric
1 sq inch [in2]			6.4516 cm2
1 sq foot [ft2]	144 in2		0.0929 m2
1 sq yd [yd2]	9 ft2		0.8361 m2
1 acre	4840 yd2		4046.9 m2
1 sq mile [mile2]	640 acres		2.59 km2

back to top

Volume/Capacity

Metric			US Measure	Imperial
1 cu cm [cm3]			0.0610 in3
1 cu decimeter [dm3]	1,000 cm3		0.0353 ft3
1 cu meter [m3]	1,000 dm3		1.3080 yd3
1 liter [l]	1 dm3		2.113 fluid pt	1.7598 pt

US Measure	Imperial		Metric
1 cu inch [in3]			16.387 cm3
1 cu foot [ft3]			0.02832 m3
1 fluid ounce	1.0408 UK fl oz		29.574 ml
1 pint (16 fl oz)	0.8327 UK pt		0.4732 liters
1 gallon (231 in3)	0.8327 UK gal		3.7854 liters

Mass

Metric			US or Imperial
1 milligram [mg]			0.0154 grain
1 gram [g]	1,000 mg		0.0353 oz
1 kilogram [kg]	1,000 g		2.2046 lb
1 tonne [t]	1,000 kg		1.1023 short ton
1 tonne [t]	1,000 kg		0.9842 long ton

US or Imperial			Metric
1 ounce [oz]	437.5 grain		28.35 g
1 pound [lb]	16 oz		0.4536 kg
1 stone	14 lb		6.3503 kg
1 hundredweight [cwt]	112 lb		50.802 kg
1 short ton (US)			0.9072 t
1 long ton (UK)			1.0160 t

back to top

Temperature

To convert from Celsius to Fahrenheit, first multiply by 9/5, then add 32.
To convert from Fahrenheit to Celsius, first subtract 32, then multiply by 5/9

(To find out why, visit the Temperature Conversion page)