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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 Btu’s to Joules, cubic feet to cubic meters, horsepower to kilowatts and inches of mercury to inches of water to name a few.
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| 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 |
| 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 10 3 |
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