Engineering Constants & Conversions To Convert Units Multiply By To Get Units Atmospheres Atm 1.0133 Bar   Atmospheres atm 29.92 Inches Mercury in. Hg Bar   0.9869 Atmospheres Atm Bar   14.504 Pounds/square inch psi British thermal unit Btu 1,055 Joules J British thermal unit Btu 0.0002931 Kilowatts kW British thermal unit Btu 0.2931 Watts Wh British thermal unit Btu 0.252 Kilocalories kcal British thermal unit/hr. Btuh 0.2931 Joules/second J/s British thermal unit/hr. Btuh 0.2931 Watt/hours Wh British thermal unit/hr. Btuh 0.0002931 Kilowatt/hours kWh British thermal unit/ inch/hour/sqft/°F Btu/in/h/ ft2/°F 0.1442 Watts/meter/°C W/m/°C British thermal unit/hr. Btuh 0.252 Kilocalories/hour kcal/h Calories cal 4.187 Joules J Centimeter cm 0.03281 Feet ft Centimeter cm 0.3937 Inches in. Centimeters/second cm/s 1.969 Feet/minute fpm Cubic centimeter Cm3 0.061 Cubic inches In3 Cubic feet Ft3 62.43 Pounds of water lb Cubic feet Ft3 28.32 Cubic centimeters cm3 Cubic feet Ft3 0.02832 Cubic meters m3 Cubic feet Ft3 7.481 Gallons, U.S. gal Cubic feet Ft3 28.32 Liters l Cubic feet/minute cfm 1.699 Cubic meters/hour m3/h Cubic feet/minute term 0.000472 Cubic meters/sec. m3/s Cubic feet/minute cfm 0.4719 Liters/second l/s Cubic inch in3 16.39 Cubic centimeters cm3 Cubic meter m3 35.32 Cubic feet ft3 Cubic meter m3 264.2 Gallons, U.S. gal Cubic meter m3 1,000 Liters l Cubic meters/hr m3/h 0.5885 Cubic feet/min. cfm Cubic meters/hr m3/h 4.403 Gallons/min. gpm Cubic meters/sec. m3/s 2,119 Cubic feet/min. cfm <<<Back Next>>>