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)
l ne\vtotl ;;:::;: 0.2247 pounds
1 kilogram = 2.2046 pounds
l kilogram. = 9.81 new't l metric ton = 1()()0 kilograms
l rnetric ton = 9.8.1 kilonewtons
l metric ton = 2204.6 pounds
1 Btu = 777.76 foot-pound


LENGTH (DISTANCE)
1 millim~ter = 0.03937 inches
l centimeter = 0.3937 inches
l meter = 3.281 fee.t
1 .kilorueter = 0.6215 miles
l meter= L0936 yards
1 Btu = 252 calories


MASS
l kilogram = 2.2046 pounds
I kilogram = 0.0685 slugs
1 Btu = 777.76 foot-pound


POWER
1 watt = l jolde per second
1 watt = 1 newton-meter per s~ond
1 kilowatt = t .341. horsepower
1 Btu = 777.76 foot-pound


PRESSURE
l pascal = l .ne'wton pi$.r square meter
1 kilopascal = 1000 pascal
l kilopascal = 0.145 Ib per square inch
l lb per square lnc.h = 6.8972 kilopasca!
1 lb per square inch = 689't2 pascals
1 Btu = 777.76 foot-pound


SPECIFIC WEIGHT
l newton pt:r cubic meter = (L0063636 p<>unds pet cubic foot
l pound per cubic foot = 14 n¢wions per c~1bic meter


VELOCITY
1 meter per second = 3.28 fe-et per second
I kilometer pt.:r hour = 0.6215 miles pet
1 Btu = 777.76 foot-pound
1 Btu = 252 calories


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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