This chart gives the conversion ratios that, as a matter of United States federal law, are required to convert between the metric system and the US Customary System of Units, commonly known as "the English system", (although several US customer units have different sizes to the British units of the same name.)

Metric Conversion Chart

English to Metric conversions

English to Metric

English                                 Metric

Inches (in)                x            2.54 = centimeters
Feet (ft)                  x              .3 = meters
Yards (yd)                 x              .9 = meters
Miles (mi)                 x             1.6 = kilometers
Square inches (in2)        x             6.5 = square centimeters
Square feet (ft2)          x              .1 = square meters
Square yards (yd2)         x              .8 = square meters
Square mile (sq mi)        x  2.589988110336 = square kilometers
Acres                      x              .4 = hectares
Cubic feet (ft3)           x             .03 = cubic meters
Cords (cd)                 x             3.6 = cubic meters
Quarts (lq) (qt)           x              .9 = liters
Gallons (gal)              x            .004 = liters
Ounces (avdp) (oz)         x            28.4 = grams
Pounds (avdp) (lb)         x              .5 = kilograms
Horsepower (hp)            x              .7 = kilowatts

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Metric to English conversions

Metric to English

Metric                                 English
Centimeters (cm)           x             .39 = inches
Meters (m)                 x             3.3 = feet
Meters (m)                 x             1.1 = yards
Kilometers (km)            x              .6 = miles
Sq. centimeters (cm2)      x              .2 = square inches
Square meters (m2)         x            10.8 = square feet
Square meters (m2)         x             1.2 = square yards
Hectares (ha)              x             2.5 = acres
Cubic meters (m3)          x            35.3 = cubic feet
Liters (l)                 x             1.1 = quarts (lq)
Cubic meters (m3)          x           284.2 = gallons
Grams (g)                  x             .04 = ounces (avdp)
Kilograms (kg)             x             2.2 = pounds (avdp)
Kilowatts (kW)             x             1.3 = horsepower

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Units of Length and Measure

Length

12 inches ........................ 1 foot
36 inches or 3 feet .............. 1 yard
1760 yards or 5280 feet .......... 1 mile

Liquid Measure

8 ounces ........................................ 1 cup
16 ounces or 2 cups ............................. 1 pint
32 ounces or 4 cups or 2 pints .................. 1 quart
64 ounces or 4 pints or 2 quarts ................ 1/2 gallon
128 ounces or 16 cups or 8 pints or 4 quarts .... 1 gallon

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Temperature Conversions

From Fahrenheit to Centigrade

To convert from degrees Fahrenheit to degrees Centigrade, subtract 32 degrees from the temperature and multiply by 5/9.

From Centigrade to Fahrenheit

To convert from degrees Centigrade to degrees Fahrenheit, multiply the temperature by 1.8 and add 32 degrees.

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Metric conversion page Metric conversion page