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Useful Conversion Factors

This table will give the engineer a quick way to convert numerous measurements and conditions to corresponding values in other systems such as Btuto Joules, cubic feet to cubic meters, horsepower to kilowatts and inches of mercury to inches of water to name a few.

Useful Conversion Factors
To Convert Into Multiply By
Atmospheres Kilopascal (Kp) 101.1
Btu Joules 1,054
Btu Kilowatt-Hrs 2.928 X 10-4
Btu/Hr Horsepower 3.929 X 10-4
Btu/Hr Watts 0.293
Btu/Hr-Sq Ft Watts/So Meter 3.15
Btu/Lb Kilojoules/Kilogram 2.33
Centigrade Fahrenheit (°C X 9/5) 32
Cost, $/Lb $/Kilogram 2.205
Cost, $/Ton (Refrig) $/Kilowatt 0.284
Cubic Feet Cu Meters 0.02832
Cubic Feet Liters 28.32
Cubic Feet/Min, Cfm L1ters/Sec 0.4720
Cubic Feet/Min (Cfm) Cubic Meter/Hr 1.6992
Cubic Inches Milliliters 16.4
Cubic Meters Cu Feet 35.31
Cubic Meters Liters 1,000
Cubic Meters/Hr Cubic Feet/Min (Cfm) .5885
Fahrenheit Centigrade (°F - 32) X 5/9
Feet Meters 0.3048
Feet/Min, Fpm Meters/Sec 5.08 X 10-3
Feet Min, Fpm Miles/Hr 0.01136
Gallons Cu Feet 0.1337
Gallons Liters 3.785
Gallons/Hr Milliliters/Sec 1.05
Gallons/Min L1ters/Sec 0.06308
Grains (1/7000 Lb) Grams 0.06480
Grains/Lb Grams/Kilogram 0.143
Grams Grains 15.43
Grams Pounds 2.204 X 10-3
Horsepower Btu/Hr 2,547
Horsepower Kilowatts 0.7457
Inches Milimeters 25.40
Inches Of Mercury Inches Of Water 13.596
Inches Of Mercury Kilopascal (Kp) 3.38
Inches Of Water (At 4° C) Inches Of Mercury 0.07355
Inches Of Water (At 4° C) Pounds/So In 0.03613
Inches Of Water (At 4° C) Pascal (P) 249.
Joules Btu 9.48 X 10-4
Joules Watt-Hrs 2.778 X 10-4
Useful Conversion Factors
To Convert Into Multiply By
Kilograms Pounds 2.205
Kilograms/Cu Meter Pounds/Ct Ft 0.06243
Kilometers Feet 3,281.
Kilometers Miles 0.6214
Kilometers/Hr Miles/Hr 0.6214
Kilowatts Btu/Hr 3,414.
Liters Cu Feet 0.03531
Liters Gallons (U. S. L10) 0.2642
L1ters/Sec Gallons/Min 15.852
Meters Feet 3,281
Meters/Sec Feet/Min 196.8
Meters/Sec Kilometers/Hr 3.6
Meters/Sec Miles/Hr 2.237
MILES (Statute) METERS 1,609.
Miles/Hr Feet/Min 88.
Miles/Hr Kilometers/Hr 1.609
Milimeters Inches 0.03937
Newton Pounds (Force) 0.225
Newton/So Meter Pascal (Pa) 1.0
Pascal (Pal Inches Of Mercury 2.959 X 10-4
Pascal (Pa) Inches Of Water 4.016 X 10-3
Pascal (Pal Pounds/So In 1.451 X 10-4
POUNDS (Force) NEWTONS 4,448
POUNDS (Mass) GRAINS 7,000.
POUNDS (Mass) KILOGRAMS 0.4536
Pounds Of Water Cu Feet 0.01603
Pounds Of Water Gallons 0.1199
Pounds Of Water Pint .9584
Pounds Of Water Liters .0316
Pounds/Ct Ft Kgs/Cu Meter 16.02
Pounds So In Inches Of Mercury 2.036
Pounds/So In Kilopascal (Kpal 6.89
Pounds/So In Inches Of Water 27.68
Tons, Refrigeration Btu/Hr 12,000.
Tons, Refrigeration Kilowatts 3.52
Watts Btu/Hr 3.414
Watts Horsepower (Elec.) 1.341 X 10-3
Watt-Hours Btu 3.414
Watt-Hours Joules 3.60 X 103

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