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Useful Conversion Factors
The following factors are provided to 10 digits of accuracy
where possible. Exact values are marked with an asterisk. For
more complete information on conversion factors, refer to
Metric Practice Guide E380-74 by the American Society for
Testing and Materials (ASTM).
Length
1inch
1 foot
1 mile (statute)t
1 mile (nautical)t
1 mile (statute)t
Area
1square inch
1 square foot
25.4 millimeters*
0.304 8 meter*
1.609 344 kilometers™
1.852 kilometers*
1.150 779 448 miles (nautical)f
6.451 6 square centimeters*
'0.092 903 04 square meter*
4
6
1acre
3560 square feet
1 square milet
40 acres
Volume
1 cubicinch
16.387 064 cubic centimeters*
1 cubic foot
0.028 316 847 cubic meter
1 ounce (fluid)t
29.573 529 56 cubic centimeters
1 ounce (fluid)t
0.029 573 530 liter
1 gallon (fluid)t
= 3.785411 784 liters*
Mass
1ounce (mass)
= 28.349523 12 grams
1pound (mass)
= 0.453592 37 kilogram*
1ton (short)
= 0.907 184 74 metric ton*
Energy
1 British thermal unit
= 1055.055 853 joules
1 kilocalorie (mean)
= 4190.02 joules
1 watt-hour
= 3600 joules*
Force
1ounce (force)
= 0.278 013 85 newton
1 pound (force)
= 4.448 221 615 newtons
Power
1 horsepower (electric) = 746 watts*
Pressure
1 atmosphere
= 760 mm Hg at sea level
1 atmosphere
= 14.7 pounds per square inch
1 atmosphere
= 101 325 pascals
Temperature
Fahrenheit
= 1.8 Celsius + 32
Celsius
= 5/9(Fahrenheit— 32)
kelvin
= Celsius + 273.15
kelvin
= 5/9 (Fahrenheit + 459.67)
kelvin
= 5/9 Rankine
T U.S.values chosen.
* Exact values.
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