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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
1 inch
25.4 millimeters*
1 foot
0.304 8 meter*
1.609 344 kilometers*
1.852 kilometers*
1.150 779 448 miles (statute)t
1 mile (statute)t
1 mile (nautical)t
1 mile (nautical)t
Area
1 square inch
1 square foot
6.451 6 square centimeters*
0.092 903 04 square meter*
43 560 square feet
6
1 acre
1 square milet
40 acres
Volume
1 cubic inch
16.387 064 cubic centimeters®
1 cubic foot
0.028 316 847 cubic meter
29.573 529 56 cubic centimeters
0.029 573 530 liter
3.785 411 784 liters*
1 ounce (fluid)t
1 ounce (fluid)t
1 gallon (fluid)t
Mass
1 ounce (mass)
1 pound (mass)
1 ton (short)
28.349 523 12 grams
0.453 592 37 kilogram*
0.907 184 74 metric ton*
Energy
1 British thermal unit
=1055.055 853 joules
1 kilocalorie (mean)
= 4 190.02 joules
1 watt-hour
= 3 600 joules™
Force
1 ounce (force)
= 0.278 013 85 newton
1 pound (force)
= 4.448 221 615 newtons
Power
1 horsepower (electric)
= 746 watts*
Pressure
1 atmosphere
1 atmosphere
1 atmosphere
760 mm Hg at sea level
14.7 pounds per square inch
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
1 U.S. values chosen.
* Exact values.
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