Table from Encarta

Imperial and Metric Conversion Factors

To Convert Multiply By To Convert Multiply By
Length
inches to millimeters 25.4 millimeters to inches 0.0393701
feet to meters 0.3048 meters to feet 3.28084
yards to meters 0.9144 meters to yards 1.09361
furlongs to kilometers 0.201168 kilometers to furlongs 4.97097
miles to kilometers 1.609344 kilometers to miles 0.621371
Area
square inches to square centimeters 6.4516 square centimeters to square inches 0.1550
square feet to square meters 0.092903 square meters to square feet 10.7639
square yards to square meters 0.836127 square meters to square yards 1.19599
square miles to square kilometers 2.589988 square kilometers to square miles 0.386102
acres to square meters 4046.856422 square meters to acres 0.000247
acres to hectares 0.404866 hectares to acres 2.469955
Volume/Capacity
cubic inches to cubic centimeters 16.387064 cubic centimeters to cubic inches 0.061024
cubic feet to cubic meters 0.028317 cubic meters to cubic feet 35.3147
cubic yards to cubic meters 0.764555 cubic meters to cubic yards 1.30795
cubic miles to cubic kilometers 4.1682 cubic kilometers to cubic miles 0.239912
fluid ounces (U.S.) to milliliters 29.5735 milliliters to fluid ounces (U.S.) 0.033814
fluid ounces (imperial) to milliliters 28.413063 milliliters to fluid ounces (imperial) 0.035195
pints (U.S.) to liters 0.473176 liters to pints (U.S.) 2.113377
pints (imperial) to liters 0.568261 liters to pints (imperial) 1.759754
quarts (U.S.) to liters 0.946353 liters to quarts (U.S.) 1.056688
quarts (imperial) to liters 1.136523 liters to quarts (imperial) 0.879877
gallons (U.S.) to liters 3.785412 liters to gallons (U.S.) 0.264172
gallons (imperial) to liters 4.54609 liters to gallons (imperial) 0.219969
Mass/Weight
ounces to grams 28.349523 grams to ounces 0.035274
pounds to kilograms 0.453592 kilograms to pounds 2.20462
stone (14 lb) to kilograms 6.350293 kilograms to stone (14 lb) 0.157473
tons (U.S.) to kilograms 907.18474 kilograms to tons (U.S.) 0.001102
tons (imperial) to kilograms 1016.046909 kilograms to tons (imperial) 0.000984
tons (U.S.) to metric tons 0.907185 metric tons to tons (U.S.) 1.10231
tons (imperial) to metric tons 1.016047 metric tons to tons (imperial) 0.984207
Speed
miles per hour to kilometers per hour 1.609344 kilometers per hour to miles per hour 0.621371
feet per second to meters per second 0.3048 meters per second to feet per second 3.28084
Force
pound-force to newton 4.44822 newton to pound-force 0.224809
kilogram-force to newton 9.80665 newton to kilogram-force 0.101972
Pressure
pound-force per square inch to kilopascals 6.89476 kilopascals to pound-force per square inch 0.145038
tons-force per square inch (imperial) to megapascals 15.4443 megapascals to tons-force per square inch (imperial) 0.064779
atmospheres to newtons per square centimeter 10.1325 newtons per square centimeter to atmospheres 0.098692
atmospheres to pound-force per square inch 14.695942 pound-force per square inch to atmospheres 0.068948
Energy
calorie to joule 4.1868 joule to calorie 0.238846
watt-hour to joule 3,600 joule to watt-hour 0.000278
Power
horsepower to kilowatts 0.7457 kilowatts to horsepower 1.34102
Fuel consumption
miles per gallon (U.S.) to kilometers per liter 0.4251 kilometers per liter to miles per gallon (U.S.) 2.3521
miles per gallon (imperial) to kilometers per liter 0.3540 kilometers per liter to miles per gallon (imperial) 2.824859
gallons per mile (U.S.) to liters per kilometer 2.3521 liters per kilometer to gallons per mile (U.S.) 0.4251
gallons per mile (imperial) to liters per kilometer 2.824859 liters per kilometer to gallons per mile (imperial) 0.3540
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Metric System
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