Conversion Factors Unless otherwise stated, pounds are U.S. avoirdupois, feet are U.S., and seconds are mean solar. NOTE: The usual measure of weight in the U.S. is avoirdupois. Multiply by to obtain Acre feet 43560 cubic feet Acre feet 1233 cubic meters Acre feet 325850 gallons (U.S.) Acres 0.4047 hectares Acres 43560 square feet Acres 4047 square meters Acres 4840 square yards Angstrom units 1 x 10-8 centimeters Angstrom units 3.937 x 10-9 inches Acres 43560 square feet Assay tons 29.17 grams Astronomical units 9.290 x 10 7 miles Atmospheres 1.013 bars Atmospheres 10333 kilograms/square meter Atmospheres 14.7 pounds/square inch Bags, cement 94 pounds of cement Barleycorns (British) 1/3 inches Barrels (British, dry) 5.780 cubic feet Barrels (British, dry) 0.1637 cubic meters Barrels (British, dry) 36 gallon (British) Barrels, cement 170.6 kilograms Barrels, cement 376 pounds of cement Barrels, cranberry 3.371 cubic feet Barrels, oil 5.615 cubic feet Barrels, oil 0.1590 cubic meters Barrels, oil 42 gallons (U.S.) Barrels (U.S., dry) 4.083 cubic feet Barrels (U.S., dry) 0.11562 cubic meters Barrels (U.S., liquid) 4.211 cubic feet Barrels (U.S., liquid) 0.1192 cubic meters Barrels (U.S., liquid) 31.5 gallons (U.S.) Bars 14.5 pounds/square inch Board feet 1/12 cubic feet Board feet 144 cubic inches Boiler horsepower 33475 Btu/hour Boiler horsepower 34.5 pounds of water evaporated from & at 212 o F (per hr) Bolts,(U.S., cloth) 120 linear feet Bolts (U.S., cloth) 36.58 meters Btu 251.98 calories, gram Btu 778 foot-pounds Btu 1054.8 joules
Btu 1076 kilograms-meters Btu 0.252 calories, kilogram Atmosphere 33.9 feet of water Atmosphere 29.92 inches of mercury Btu 6.876 x 10-5 pounds of carton to C0 2 Btu 0.293 Watt-hours Btu/pound 0.5556 calories, gram/gram Btu/pound/ o F 1 calories,gram/gram/ o C Btu/hour (feet 2 ) o F 4.882 kilogram-calorie/hr (m 2 ) o C Btu (60 o F) 1054.6 joules Buckets (British, dry) 4 gallons (British) Bushels (British) 1.032 bushels (U.S.) Bushels (U.S.) 1.2444 cubic feet Bushels (U.S.) 0.035 cubic meters Bushels (U.S.) 4 pecks (U.S.) Butts (British) 20.2 cubic feet Butts (British) 126 gallons (British) Cable lengths 720 feet Cable lengths 219.46 meters Calories, gram 3.97 x 10-3 Btu Calories, gram 3.0874 foot-pounds Calories, gram 4.186 joules Calories, gram 0.42685 kilogram-meters Calories, gram 0.0011628 watt-hours Calories, kilogram 1000 calories, gram Calories, gram/gram 1.8 Btu/pound Candle power (spherical) 12.566 lumens Candles (int) 1 lumen (int) steradian Candles (int)/square foot 3.1416 foot-lamberts Candles (int)/square foot 3.382 x 10-3 lamberts Carats (metric) 3.0865 grains Carats (metric) 0.2 grams Centals 100 pounds Centigrade heat units (chu) 1.8 Btu Centimeters 0.032 feet (U.S.) Centimeters 0.3937 inches (U.S.) Centipoises 2.42 pounds/foot hour Centipoises 6.72 x 10-4 pounds/foot second Chains (engineers') 100 feet Chains (engineers') 30.48 meters Chains (surveyor's) 66 feet Chains (surveyor's) 20.12 meters Chaldrons (British) 32 bushels (British) Chaldrons (U.S.) 36 bushels (U.S.) Circular inches 0.7854 square inches Circular millimeters 7.854 x 10-7 square meters Circular mils 7.854 x 10-7 square inches
Circumferences 360 degrees Cloves 8 pounds Coomb 4 bushels (British) Cords 8 cord feet Cords 128 cubic feet Cords 3.625 cubic meters Cubic centimeters 3.53 x 10-5 cubic feet Cubic centimeters 3.64 x 10-4 gallons (U.S.) Cubic centimeters 0.0338 ounces (U.S., fluid) Cubic feet 28317 cubic centimeters Cubic feet 1728 cubic inches Cubic feet 7.48 gallons (U.S.) Cubic feet 28.3 liters Cubic foot-atmosphere 2.72 Btu Cubic foot-atmosphere 2116 foot-pounds Cubic feet of common brick 120 pounds Cubic feet of water (60 o F) 67.4 pounds Cubic feet/second 1.98 acre-feet/day Cubic feet/second 448.83 gallons/minute Cubic feet/second 0.646 millon gallons/day Cubic inches 16.387 cubic centimeters Cubic inches 0.554 ounces (U.S., fluid) Cubic meters 8.1074 x 10-4 acre-feet Cubic meters 8.367 barrels (U.S., liquid) Cubic meters 35.314 cubic feet Cubic meters 71023 cubic inches Cubic meters 1.308 cubic yards Cubic meters 264.17 gallons (U.S.) Cubic meters 999.973 liters Cubic yards 27 cubic feet Cubic centimeters 0.061 cubic inches Cubic feet 0.03704 cubic yards Cubic inches 5.787 x 10-4 cubic feet Cubic inches 4.329 x 10-3 gallons Cubic yards 0.76456 cubic meters Cubic yards of sand 2700 pounds Days (sidereal) 86164 seconds (mean solar) Degrees (angle) 0.01745 radians Degrees/second 0.1667 revolutions/minute Brachms (British, fluid) 0.125 ounces (British,fluid) Drams (troy) 2.1943 drams (avoirdupois) Drams (troy) 0.125 ounces (troy) Drams (avoirdupois) 1.77 grams Drams (avoirdupois) 0.0625 ounces (avoirdupois) Cubits 1.5 feet Drams (U.S., fluid) 0.125 ounces (fluid) Dynes 0.001 grams
Dynes 2.248 x 10-6 pounds Dyne-centimeter (torque) 7.3756 x 10-8 pound-feet Dynes/centimeter 1 ergs/square centimeter Dynes/square centimeter 0.01020 kilograms/square meter Dynes/square centimeter 0.1 newtons/square meter Dynes/square centimeter 1.450 x 10-5 pounds/square inch Electron-volts 1.6020 x 10-12 ergs Ells 114.30 centimeters Ells 45 inches Ems, pica (printing) 0.42333 centimeters Ems, pica (printing) 1/6 inches Ergs 9.4805 x 10-11 Btu Ergs 2.3889 x 10-8 calories, gram Ergs 7.3756 x 10-8 foot-pounds Faradays 26.80 ampere-hours Faradays 96500 coulombs Faradays/seconds 96500 ampheres Fathoms 6feet Feet 30.48 centimeters Feet 0.3048 meters Feet 1.8939 x 10-4 miles (statute) Feet of air (1 atm, 60 o F) 5.30 x 10-4 pounds/square inch Feet of water 0.8826 inches of mercury Feet of water.197 kilograms/square inch Feet of water 0.434 pounds/square inch Feet/second 1.0973 kilometers/hour Feet/second 0.68 miles/hour Feet/second/second 1.0973 kilometers/hour/second Firkins (British) 9 gallons (British) Firkins (U.S.) 9 gallons (U.S.) Foot-poundals 3.995 x 10-5 Btu Foot-poundals 0.0421 joules Foot-pound 0.00129 Btu Foot-pounds 0.324 calories, gram Foot-pounds 1.136 x 10 7 ergs Foot-pounds 32.174 foot-poundals Foot-pounds 1.356 joules Foot-pounds 0.138 kilogram-meters Foot-pounds 0.0134 liter-atmospheres Foot-pounds 3.766 x 10-4 watt-hours Foot-pounds/second 4.628 Btu/hour Feet/minute 0.01667 feet/second Feet/second 60 feet/minute Foot-pounds/second 0.001818 horsepower Foot-pounds/second 1.356 watts (abs) Furlongs 660 feet Furlongs 201.17 meters
Furlongs 0.125 miles Furlongs 40 rods Gallons (British) 4516 cubic centimeters Gallons (British) 1.20 gallons (U.S.) Gallons (British) 10 pounds (avoirdupois) of water at 62 o F Gallons (U.S.) 3785 cubic centimeters Gallons (U.S.) 0.13368 cubic feet (U.S.) Gallons (U.S.) 231 cubic inches Gallons (U.S.) 4.951 x 10-3 cubic yards Gallons (U.S.) 3.785 liters Gallons (U.S.) 128 ounces (U.S.) fluid Gills (British) 5 ounces (British) fluid Gills (U.S.) 32 drams (fluid) Grains 0.0366 drams (avoirdupois) Grains 1/7000 pounds (avoirdupois) Grams 980 dynes Grams 15.43 grains (troy) Grams 10-3 kilograms Grams 10 3 milligrams Grams 0.03527 ounces Grams 0.03215 ounces (troy) Grams 0.0709 poundals Grams 2.205 x 10-3 pounds Gram-calories 3.968 x 10-3 British thermal units Gram-centimeters 9.297 x 10-3 Btu Gram-centimeters 2.34 x 10-5 calories, gram Gram-centimeters 7.23 x 10-4 foot-pounds Gram-centimeters 9.81 x 10-5 joules Gram-centimeters 2.72 x 10-8 watt-hours Gram-centimeters/second 9.807 x 10-5 watts Grams-centimeters 2 (moment of inertia) 2.417 x 10-6 pounds-feet 2 Grams-centimeters 2 (moment of inertia) 3.417 x 10-4 pounds-inch 2 Grams/cubic centimeter 62.428 pounds/cubic foot Grams/cubic centimeter 8.345 pounds/gallon (U.S.) Grams/cubic meter 0.437 grains/cubic foot Gallons (U.S.) 8 pints (U.S., liquid) Gallons (U.S.) 4 quarts (U.S., liquid) Gallons (U.S.) water 8.33 pounds water Grams/liter 58.417 grains/gallon (U.S.) Grams/liter 10-3 grains/cubic centimeter Grams/liter 1000 parts per million (ppm) Grams/liter 0.0624 pounds/cubic foot Grams/square centimeter 0.0142 pounds/square inch Hands 4 inches
Hogsheads (British) 63 gallons (British) Hogsheads (U.S.) 8.422 cubic feet Hogsheads (U.S.) 0.2385 cubic meters Hogsheads (U.S.) 63 gallons (U.S.) Horsepower 2545 Btu (mean)/hour Horsepower 33,000 foot-pounds/minute Horsepower 550 foot-pounds/second Horsepower 0.7457 kilowatts Horsepower (metric) 0.986 horsepower Horsepower-hours 2545 Btu Horsepower-hours 1.98 x 105 foot-pounds Horsepower-hours 2.737 x 105 kilogram-meters Horsepower-hours 0.7457 kilowatt-hours Hundred weight (cwt) 100 pounds Hundred weights (long) 112 pounds Inches 2.54 centimeters Inches 1000 mils Inches of mercury at 32 o F 354.31 kilograms/square meter Inches of mercury at 32 o F 0.4912 pounds/square inch Joules 107 ergs Joules 0.738 foot-pounds Joules 0.1020 kilogram-meters Karats (1 of gold to 24 of mixture) 41.667 milligrams/gram Kilderkins (British) 18 gallons (British) Kilograms 980665 dynes Kilograms 15432 grains Kilograms 35.27 ounces (avoirdupois) Kilograms 70.93 poundals Hectares 2.471 acres Hectares 1.076 x 10 5 square feet Horsepower 1.014 horsepower (metric) Horsepower 10.70 kg-calories/minute Hectares 2.471 acres Hectares 1.076 x 10 5 square feet Inches of mercury 1.133 feet of water Inches of mercury 13.6 inches of water Inches of water 0.036 pounds/square inch Kilograms 2.205 pounds Kilograms 0.842 x 10-4 tons (long) Kilograms 0.001 tons (metric) Kilograms 0.0011 tons (short) Kilograms-meters 0.0093 Btu Kilogram-meters 2.3427 calories,gram Kilogram-meters 9.81 x 10 7 ergs Kilogram-meters 7.2330 foot-pounds Kilogram-meters 3.6529 x 10-6 horsepower-hours
Kilogram-meters 9.81 joules Kilogram-meters 2.524 x 10-6 kilowatt hours (abs) Kilogram-meters 9.759 x 10-6 pounds water evap. at 212 o F Kilogram/square meter 9.6784 x 10-5 atmospheres Kilograms/square meter 98.066 dynes/square centimeters Kilograms/square meter 3.281 x 10-3 feet of water at 39.2 0 F Kilograms/square meter 0.1 grams/square centimeters Kilograms/square meter 2.896 x 10-3 inches of mercury at 32 o F Kilograms/square meter 0.07356 mm of mercury at 0 o C Kilograms/square meter 0.2048 pounds/square foot Kilograms/square meter 0.00142 pounds/square inch Kilowatt-hours 3413 Btu Kilowatt-hours 2.655 x 10 6 foot-pounds Kilowatt-hours 3.67 x 10 5 kilogram-meters Kilowatts 1.341 horsepower Knots 1.689 feet/second Knots 1 miles (nautical) Knots 1.152 miles (statute)/hour Leagues Leagues 3miles (nautical) Leagues (statute) 3 miles (statute) Light Years 5.8781 x 10 12 miles Links (Gunter's) 0.01 chains (Gunter's) Links (Gunter's) 0.66 feet Links (Ramden's) 1 feet Links (Ramden's) 0.01 chains (Ramden's) Liter-atmospheres (normal) 0.096 Btu Liter-atmospheres (normal) 24.2 calories, gram Liter-atmospheres (normal) 74.735 foot-pounds Liter-atmospheres (normal) 10.33 kilogram-meters Kilometers 3281 feet Kilometers 0.6214 miles Liters 1000 cubic centimeters Liters 0.0353 cubic feet Liters 0.264 gallons (U.S.) Liters 1.057 quarts (U.S., liquid) Lumens 0.08 candle power (spherical) Lumens 0.00147 watts of maximum velocity radiation Lumens/square centimeters 1 lamberts Lumens/square centimeters/ steradian 3.14 lamberts Lumens/square foot 1 foot-candles Lumens/square feet/ steradian 3.38 millilamberts Lumens/square meter 0.093 foot candles or lumens/square foot Lux 0.093 foot-candles
Meters 10 10 angstrom units Meters 3.281 feet Meters 39.37 inches Meters 6.2137 x 10-4 miles (statute) Meters 1.094 yards Meters/second 2.237 miles/hour Microns 1 x 10-4 centimeters Miles (nautical) 1.852 kilometers Miles (statute) 80 chains (Gunter's) Miles (statute) 5280 feet Miles (statute) 1609 meters Miles (statute) 1760 yards Miles/hour 44.704 centimeters/second Miles/hour 1.4667 feet/second Miles/hour 0.868 knots Miles/hour/second 1.4667 feet/second/second Milligarms/assay ton 1 ounces (troy)/ton (short) Mils 0.001 inches Mils 25.40 microns Meters/second 3.284 feet/second Meters/second 6 kilometers/hour Miles (nautical) 1.52 miles (U.S.,statute) Miles (statute) 8 furlongs Miles (statute) 1.6093 kilometers Miles (statute) 0.8684 miles (nautical) Miles/hour 1.6093 kilometers/hour Minims (U.S.) 0.0616 cubic centimeters Months (mean calendar) 30.42 days Months (mean calendar) 730.1 hours Months 43805 minutes Months 2.628 x 10 6 seconds Newtons 10 5 dynes Newtons 0.1020 kilograms Newtons 0.225 pounds Noggins (British) 1/32 gallons (British) Ounces (avoirdupois) 16 drams (avoirdupois) Ounces (avoirdupois) 28.35 grams Ounces (avoirdupois) 0.911 ounces (troy) Ounces (avoirdupois) 1/16 pounds (avoirdupois) Ounces (troy) 31.10 grams Ounces (troy) 1.097 ounces (avoirdupois) Ounces (troy) 1/12 pounds (troy) Ounces (U.S., fluid) 29.57 cubic centimeters Ounces (U.S., fluid) 1.80 cubic inches Ounces (U.S., fluid) 8drams (fluid) Ounces (U.S., fluid) 1/128 gallons (U.S.) Paces 30 inches
Palms (British) 3 inches Parts per million (ppm) 0.05842 grains/gallon (U.S.) Pecks 0.25 bushels Pennyweights 24 grains Pennyweights 1.555 grams Pennyweights 0.05 ounces (troy) Perches (Masonry) 24.75 cubic feet Phots 929.0 foot-candles Picas (printer's) 1/6 inches Pieds (French feet) 1.066 feet Pints (U.S.,dry) 33.60 cubic inches Pints (U.S.,dry) 28.87 cubic inches Pints (U.S.,liquid) 16 ounces (U.S.,fluid) Pottles (British) 0.5 gallons (British) Pounces (Paris inches) 1.066 inches (U.S.) Poundals 14.098 grams Poundals 0.031 pounds Pound-feet (torque) 1.3558 x 10 7 dyne-centimeters Pounds (avoirdupois) 7000 grains Pounds (avoirdupois) 453.59 grams Pounds (avoirdupois) 1.215 pounds (troy) Pounds (troy) 373.24 grams Pounds (troy) 0.8829 pounds (avoirdupois) Pounds of carbon to CO 2 14544 Btu Pounds of water evaporated at 212 o F 970.3 Btu Pounds/square foot 4.88 kilograms/square meter Pounds/square inch 0.068 atmospheres Pounds/square inch 70.307 grams/square centimeter Pounds/square inch 703.07 kilograms/square meter Pounds/square inch 51.715 millimeter of mercury at 0 o C Proff (U.S.) 0.5 percent alcohol by volume Quadrants 90 degrees Quarts (U.S., liquid) 0.0334 cubic feet Quarts (U.S., liquid) 32 ounces (U.S., fluid) Quarts (U.S., liquid) 0.833 quarts (British) Quarts (British) 1.2 quarts (U.S.) Quintals (metric) 100 kilograms Quintals (long) 112 pounds Quintals (short) 100 pounds Quires (of paper) 24 or 25 sheets Radians 57.296 degrees Reams 500 sheets Pounds/square inch 2.307 feet of water Pounds/square inch 2.036 inches of mercury Pounds/square inch 6894.757 Pascals Register tons (British) 100 cubic feet
Revolutions 360 degrees Revolutions/minute 0.1047 radians/second Revolutions/minute/minute 0.001745 radians/second/second Rods 16.5 feet Rods 5.03 meters Rods 3.125 x 10-3 miles Rods 5.5 yards Roods (British) 0.25 acres Score 20 units Scruples 1/3 drams (troy) Scruple 20 grains Sections 640 acres Sections 1square miles Slugs 32.17 pounds Spans 9 inches Square centimeters 1.076 x 10-3 square feet Square centimeters 0.155 square inches Square chains (Gunter's) 0.1 acres Square chains (Gunter's) 404.7 square meters Square chains (Ramden's) 0.23 acres Square chains (Ramden's) 10000 square feet Square feet 929 square centimeters Square feet 0.0929 square meters Square inches 6.4516 square centimeters Square inches 7.716 x 10-4 square yards Square kilometers 0.386 square miles Square links (Gunter's) 10-5 acres Square links (Gunter's) 0.0405 square meters Square meters 2.417 x 10-4 acres Square meters 10.764 square feet Square meters 1550 square inches Square meters 3.86 x 10-5 square miles (statute) Square meters 1.196 square yards Square miles 640 acres Square miles 2.788 x 10 7 square feet Square miles 2.590 x 10 6 square meters Square rods 6.251 x 10-3 acres Square rods 272.3 square feet Square chains (Gunter's) 4356 square feet Square feet 2.296 x 10-5 acres Square feet 144 square inches Square inches 6.944 x 10-3 square feet Square yards 1296 square inches Square yards 0.836 square meters Stones (British) 14 pounds Tons (long) 1016 kilograms Tons (long) 2240 pounds
Tons (metric) 1000 kilograms Tons (metric) 2204.6 pounds Tons (short) 907.2 kilograms Tons (short) 2000 pounds Townships (U.S.) 23040 acres Townships (U.S.) 36 square miles Tuns 252 gallons Watts 3.413 Btu/hour Watts 0.01433 calories, kilogram/minute Watts 107 ergs/second Watts 0.7376 foot-pounds/second Watts 0.00134 horsepower(electrical) Watts 0.1020 kilogram-meters/second Yards 3 feet Yards 0.914 meters Years (common) 365 days Years (common) 8760 hours Years (leap) 366 days Years (leap) 8784 hours