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
 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

DENSITY
 1000 kilograms per cubic meter = 1.94 slugs per cubic foot 1 slug per cubic foot = 515.5 kilograms per cubic meter

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

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
 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

ENERGY PER UNIT AREA
 1 langley = 1 calorie per square centimeter

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
 1 pound = 4.448 newtons 1 pound = 0.4536 kilograms 1 ton = 2000 pounds 1 ton = 0.9072 metric tons

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
 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

MASS
 1 kilogram = 2.2046 pounds 1 kilogram = 0.068522 slugs
 1 pound = 0.4536 kilograms 1 slug = 14.5939 kilograms

POWER
 1 watt = 1 joule per second 1 watt = 1 newton-meter per second 1 kilowatt = 1.341 horsepower
 1 horsepower = 550 foot-pound per second 1 horsepower = 0.7457 kilowatts

PRESSURE
 1 pascal = 1 newton per square meter 1 kilopascal = 1000 pascal 1 kilopascal = 0.145045 lbs per square inch
 1 lb per square inch = 6.8944 kilopascals 1 lb per square inch = 6894.4 pascals

SPECIFIC WEIGHT
 1 newton per cubic meter = 0.006366195 pounds per cubic foot 1 pound per cubic foot = 157.08 newtons per cubic meter

VELOCITY
 1 meter per second = 3.2808 feet per second 1 kilometer per hour = 0.62137 miles per hour
 1 foot per second = 0.3048 meters per second 1 mile per hour = 1.60935 kilometers per hour

VISCOSITY (ABSOLUTE)
 1 poise = 0.1 .tH!\Vton"second per square meter = 0.0020878 lb.second square foot l centipoise = 0.01 poise
 1 Btu = 777.76 foot-pound 1 Btu = 252 calories

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
 1 Btu = 777.76 foot-pound 1 Btu = 252 calories

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
 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

COMMON CONSTANTS

GRAVITATIONAL ACCELERATION
 9.8l' t:ttet~rs per square second 98t,centimeters per square second
 1 square inch = 6.4516 square centimeters

DENSITY OF WATER (AT 4°C)
 1000 kilograms per cubic meter I gram per cubic centimeter t ~md 760 mm Hg: kiLoriewtons per cubic meter .2°C and 760 mm Hg: 9.789 k'ilonewtons per cubic meter 32...t7 feet persquare second 1. 94 slugs per cubk foot
 1 square inch = 6.4516 square centimeters

SPECIFIC WEIGHT OF WATER
 9.789 k'ilonewtons per cubic meter 32...t7 feet persquare second 1. 94 slugs per cubk foot L94 (lb·f)-s2'/ft4 62.43 tb·f cubic foot 61.32 lb~f per cubic foot
 1 square inch = 6.4516 square centimeters

STANDARD SEA-LEVEL ATMOSPHERIC PRESSURE
 per square meter eters of Hg meters of H20 l4.7lb per square inch 29.92 in. Hg
 33,9 ft o.f H20

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