The three basic metric units are the meter (length), the gram (weight), and the liter (volume). The key to metric prefixes are:
- 1000 = kilo
- 100 = hecto
- 10 = deca
- 0.1 = deci
- 0.01 = centi
- 0.001 milli
1 Kelometer
= 0.62137 mi
1 Meter
= 3.2808 ft
1 Centimeter
= 0.3937 in
1 Mile
= 1.6093 km
1 Foot
= 0.3048 m
1 Inch
= 2.54 cm
1 kilogram
= 2.2046 lbs
1 gram
= 0.0353 oz
1 short ton
= 907.1847 kilos
1 pound
= 0.4536 kilos
1 ounce
= 28.3495 g
1 hectoliter
= 100 l
= 0.1 m³
= 26.4172 gal
1 liter
= 100 cl
= 1 dm³
= 1.0567 qt
1 gallon (U.S.)
= 3.7853 l
1 cubic inch
= 16.3871 cm³
1 square kilometer
= 1 million m²
= 0.3861 mi²
1 hectare
= 10,000 m²
= 2.471 acres
1 square meter
= 10.7639 ft²
= 1550.003 in²
1 square mile
= 640 acres
= 258.9988 ha²
1 square foot
= 144 in²
= 929.0304 cm²