Engineering Constants & Conversions To Convert Units Multiply By To Get Units Feet ft 30.48 Centimeters cm Feet ft 0.3048 Meters m Feet/minute fpm 0.508 Centimeters/sec. cm/s Feet/minute fpm 0.00508 Meters/sec. m/s Gallon, Imperial   1.201 Gallons, U.S. gal Gallon, U.S. gal 231 Cubic inches in3 Gallon, U.S. gal 0.1337 Cubic feet ft3 Gallon, U.S. gal 8.337 Pounds of water lb Gallon, U.S. gal 0.8327 Gallon, Imperial   Gallon, U.S. gal 3.785 Liters l Gallon, U.S. gal 0.003785 Cubic Gallons/minute gpm 0.2271 Cubic meters/hr Gallons/minute gpm 0.06309 Liters/sec. l/s Grams g 0.035274 Ounces oz Grams g 0.002205 Pounds lb Grams/cu centimeter g/cm3 1,000 Kilograms/cu. Meter Kg/m3 Grams/cu. Centimeter g/cm3 62.43 Pounds/cubic. Ft Lb/ft3 Grams/cu. Centimeter g/cm3 0.03613 Pounds/cubic inch Lb/in3 Horsepower hp 0.7457 Kilowatts kW Horsepower hp 2,545 British thermal Horsepower hp 33,000 Foot-lbs/min ft-lb/min Horsepower, boiler bhp 9.803 Kilowatts Horsepower, boiler bhp 3,352 British Inches in. 2.54 Centimeters cm Inches in. 25.4 Millimeters mm Inches Mercury In. Hg 0.03342 Atmospheres atm Inches Mercury In. Hg 0.03937 Torr   Joules J 0.000948 British thermal unit btu Joules J 0.2388 Calories cal Joules J 0.0002778 Watt/hrs Wh Joules/second J/s 1 Watts W Kilocalories/hour kcal/h 3.969 British thermal unit/hr. btuh Kilograms kg 2.205 Pounds Lb. Kilo./cubic meter Kg/m3 0.001 Grms/cu centimtere g/cm3 Kilo./cubic meter Kg/m3 0.0624 Pounds/cu. Foot Lb/ft3 Kilograms/sq cm Kg/cm2 14.22 Pounds/square inch psi Kilojoule kJ 0.2778 Watt/hrs Wh Kilometers/hour km/h 0.6315 Miles/hr mph Kilopascal kPa 0.145 Pounds/square inch psi Kilowatt/hours kWh 3,412 British ther. Units/hr. btuh Kilowatt kW 3,412 British ther. Units btu <<<Back Next>>>