UNIT CONVERSIONS
AREA
1 square centimeter = 0.155 square inch
1 square meter = 10.764 square feet
1 hectare = 2.471 acres
1 hectare = 10,000 square meters
1 square kilometer = 0.3861 square miles
1 hectare = 0.003861 square miles
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1 square inch = 6.4516 square centimeters
1 square foot = 0.0929` square meters
1 acre = 0.4047 hectares
1 acre = 43,560 square feet
1 square mile = 2.59 square kilometers
1 square mile = 259 hectares
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DENSITY
1000 kilograms per cubic meter = 1.94 slugs per cubic foot
1 slug per cubic foot = 515.5 kilograms per cubic meter
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DISCHARGE (FLOW RATE)
1 cubic meter per second = 35.315 cubic foot per second
1 cubic foot per second = 0.028317 cubic meters per second
1000 gallons per minute (1000 gpm) = 2.228 cubic feet per second
1 million gallons per day = 0.04381 cubic meters per second
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ENERGY (WORK OR QUANTITY OF HEAT)
1 joule = 1 newton-meter
1 joule = 0.7375 foot-pound
1 calorie = 4.184 joules
1 kilowatt-hour = 3,414 Btu
1 kilowatt-hour = 3,600,000 joules
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1 Btu = 777.76 foot-pound
1 foot-pound = 1.3558 joules
1 Btu = 1,054.5 joules
1 Btu = 0.0002929 kilowatt-hour
1 Btu = 252 calories
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ENERGY PER UNIT AREA
1 langley = 1 calorie per square centimeter
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FORCE (WEIGHT)
1 newton = 0.22482 pounds
1 kilogram = 2.2046 pounds
1 kilogram = 9.806 newtons
1 metric ton = 1000 kilograms
1 metric ton = 9.806 kilonewtons
1 metric ton = 2204.6 pounds
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1 pound = 4.448 newtons
1 pound = 0.4536 kilograms
1 ton = 2000 pounds
1 ton = 0.9072 metric tons
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LENGTH (DISTANCE)
1 millimeter = 0.03937 inches
1 centimeter = 0.3937 inches
1 meter = 3.2808 feet
1 kilometer = 0.62137 miles
1 meter= 1.0936 yards
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1 inch = 25.4 millimeters
1 inch = 2.54 centimeters
1 foot = 0.3048 meters
1 mile = 1.609344 kilometers
1 yard = 0.9144 meters
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MASS
1 kilogram = 2.2046 pounds
1 kilogram = 0.068522 slugs
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1 pound = 0.4536 kilograms
1 slug = 14.5939 kilograms
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POWER
1 watt = 1 joule per second
1 watt = 1 newton-meter per second
1 kilowatt = 1.341 horsepower
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1 horsepower = 550 foot-pound per second
1 horsepower = 0.7457 kilowatts
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PRESSURE
1 pascal = 1 newton per square meter
1 kilopascal = 1000 pascal
1 kilopascal = 0.145045 lbs per square inch
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1 lb per square inch = 6.8944 kilopascals
1 lb per square inch = 6894.4 pascals
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SPECIFIC WEIGHT
1 newton per cubic meter = 0.006366195 pounds per cubic foot
1 pound per cubic foot = 157.08 newtons per cubic meter
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VELOCITY
1 meter per second = 3.2808 feet per second
1 kilometer per hour = 0.62137 miles per hour
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1 foot per second = 0.3048 meters per second
1 mile per hour = 1.60935 kilometers per hour
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VISCOSITY (ABSOLUTE)
1 poise = 0.1 .tH!\Vton"second per square
meter
= 0.0020878 lb.second square
foot
l centipoise = 0.01 poise
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1 Btu = 777.76 foot-pound
1 Btu = 252 calories
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VISCOSITY (KINEMATIC)
I stoke = 1 square centimeter per second
l centistoke = O.Ol stoke
1 centistoke ±::::: 0.000001 stzuare meter per
second
l centistoke = 0.000010764 square feet per
second
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1 Btu = 777.76 foot-pound
1 Btu = 252 calories
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VOLUME
1 liter = 0.1642 U . . gallons
l liter = 0.03531:5 cubic feet
t liter = 0.001 cubic meter
l cubic meter = 35,315 cubic feet
1 cubic meter= 1.308 cubic yards
1 cubic meter = 264.%7 U.S. gallons
l cubic hectometer = l million cubic rneters
1 cu hie hectometer = 81.0. 7! acre· feet
10,000 cubic meters == 4.0873 (ft3 f:sl·day
! foot per second = 0.3048 met~rs pet
serond
1 mile per hour :::=: 1.609 kilometers per
hour
l HHeeond per square foot = 478.97 poise
l lb·second per square foot = 47897
centipoise
1 square foot per second = 929.03 stoke
1 square foot per second = 92,903
centistol-:e
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1 U.S. gaJlon = 3. 78541itcrs
1 cubic foot = 28.317 liters
l U.S. gallon = 0.13368 cubic feet
l cu bic foot = 0.028311 cubic meters
l cubic yard = 0. 7646 cubic meters
1 m.illirm U.S. gallons = 3185.4 <:ubi.c
meters
1 million cubic .feet= 28,317 cubk meters
l acre·foot = l2JJ.S cubic meters
l (ffls)·day = 2446.6 cubic meters
l (ftl/ s).day ; 1.983 acre·feet
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