Common Conversion Factors by Brandy McNeilin Electrical TablesFebruary 13, 2017 Multiply: By: To Obtain: Acres 43560 Square Feet Acres 1.562 x 10-3 Square Miles Acre-Feet 43560 Cubic Feet Amperes per sq cm 6.452 Amperes per sq in. Amperes per sq in. 0.1550 Amperes per sq cm. Ampere-Turns 1.257 Gilberts Ampere-Turns per cm 2.540 Ampere-Turns per in. Ampere-Turns per in. 0.3937 Ampere-Turns per cm. Atmospheres 76.0 Cm of mercury Atmospheres 29.92 Inches of mercury Atmospheres 33.90 Feet of Water Atmospheres 14.70 Pounds per sq in. British thermal units 252.0 Calories British thermal units 778.2 Foot-Pounds British thermal units 3.960 x 10-4 Horsepower-Hours British thermal units 0.2520 Kilogram-calories British thermal units 107.6 Kilogram-meters British thermal units 2.931 x 10-4 Kilowatt-hours British thermal units 1055 Watt-seconds Btu per hour 2.931 x 10-2 Kilowatts Btu per minute 2.359 x 10-2 Horsepower Btu. per minute 1.759 x 10-2 Kilowatts Bushels 1.244 Cubic Feet Centimeters 0.3937 Inches Circular mils 5.067 x 10-6 Square centimeters Circular mils 0.7854 x 10-6 Square inches Circular mils 0.7854 Square mils Cords 128 Cubic Feet Cubic Centimeters 6.102 x 10-6 Cubic Inches Cubic feet 0.02832 Cubic meters Cubic feet 7.481 Gallons Cubic feet 28.32 Liters Cubic Inches 16.39 Cubic centimeters Cubic meters 35.31 Cubic feet Cubic meters 1.308 Cubic yards Cubic yards 0.7646 Cubic meters Degrees [angle] 0.01745 Radians Dynes 2.248 x 10-6 Pounds Ergs 1 Dyne-centimeters Ergs 7.37 x 10-6 Foot-pounds Ergs 10-7 Joules Farads 106 Microfarads Fathoms 6 Feet Feet 30.48 Centimeters Feet of Water .08826 Inches of mercury Feet of Water 304.8 Kg per square meter Feet of Water 62.43 Pounds per square ft. Feet of Water 0.4335 Pounds per square in. Foot-pounds 1.285 x 10-2 British thermal units Foot-pounds 5.050 x 10-7 Horsepower-hours Foot-pounds 1.356 Joules Foot-pounds 0.1383 Kilogram-meters Foot-pounds 3.766 x 10-7 Kilowatt-hours Gallons 0.1337 Cubic Feet Gallons 231 Cubic Inches Gallons 3.785 x 10-3 Cubic Meters Gallons 3.785 Liters Gallons per minute 2.228 x 10-3 Cubic Feet per second Gausses 6.452 Lines per square in. Gilberts 0.7958 Ampere-turns Henries 103 Millihenries Horsepower 42.41 Btu per min Horsepower 2544 Btu per hour Horsepower 550 Foot-pounds per sec Horsepower 33000 Foot-pounds per min Horsepower 1.014 Horsepower (metric) Horsepower 10.70 Kg calories per min Horsepower 0.7457 Kilowatts Horsepower (boiler) 33520 Btu per hour Horsepower – hours 2544 British thermal units Horsepower – hours 1.98 x 106 Foot-pounds Horsepower – hours 2.737 x 105 Kilogram-meters Horsepower – hours 0.7457 Kilowatt-hours Inches 2.540 Centimeters Inches of mercury 1.133 Feet of water Inches of mercury 70.73 Pounds per square ft. Inches of mercury 0.4912 Pounds per square in. Inches of water 25.40 Kg per square meter Inches of water 0.5781 Ounces per square in. Inches of water 5.204 Pounds per square ft. Joules 9.478 x 10-4 British thermal units Joules 0.2388 Calories Joules 107 Ergs Joules 0.7376 Foot-Pounds Joules 2.778 x 10-7 Kilowatt-hours Joules 0.1020 Kilogram-meters Joules 1 Watt-seconds Kilograms 2.205 Pounds Kilogram-calories 3.968 British thermal units Kilogram meters 7.233 Foot-pounds Kg per square meter 3.281 x 10-3 Feet of water Kg per square meter 0.2048 Pounds per square ft. Kg per square meter 1.422 x 10-3 Pounds per square in. Kilolines 103 Maxwells Kilometers 3.281 Feet Kilometers 0.6214 Miles Kilowatts 56.87 Btu per min Kilowatts 737.6 Foot-pounds per second Kilowatts 1.341 Horsepower Kilowatts-hours 3.415 British thermal units Kilowatts-hours 2.655 x 106 Foot-pounds Knots 1.152 Miles Liters 0.03531 Cubic Feet Liters 61.02 Cubic Inches Liters 0.2642 Gallons Log Ne or in N 0.4343 Log10N Log N 2.303 Loge N or in N Lumens per square ft. 1 Footcandles Maxwells 10-3 Kilolines Megalines 106 Maxwells Megaohms 106 Ohms Meters 3.281 Feet Meters 39.37 Inches Meter-kilograms 7.233 Pound-feet Microfarads 10-6 Farads Microhms 10-6 Ohms Microhms per cm cube 0.3937 Microhms per in cube Microhms per cm cube 6.015 Ohms per mil foot Miles 5280 Feet Miles 1.609 Kilometers Miner’s Inches 1.5 Cubic feet per min. Ohms 10-6 Megohms Ohms 106 Microhms Ohms per mil foot 0.1662 Microhms per cm cube Ohms per mil foot 0.06524 Microhms per in. cube Poundals 0.03108 Pounds Pounds 32.17 Poundals Pound-feet 0.1383 Meter-kilograms Pounds of water 0.01602 Cubic Feet Pounds of water 0.1198 Gallons Pounds per cubic foot 16.02 Kg per cubic meter Pounds per cubic foot 5.787 x 10-4 Pounds per cubic in. Pounds per cubic inch 27.68 Grams per cubic cm. Pounds per cubic inch 2.768 x 10-4 Kg per cubic meter Pounds per cubic inch 1.728 Pounds per cubic ft. Pounds per square foot 0.01602 Feet of Water Pounds per square foot 4.882 Kg per square meter Pounds per square foot 6.944 x 10-3 Pounds per sq. in. Pounds per square inch 2.307 Feet of Water Pounds per square inch 2.036 Inches of Mercury Pounds per square inch 703.1 Kg per square meter Radians 57.30 Degrees Square centimeters 1.973 x 105 Circular mils Square Feet 2.296 x 10-5 Acres Square Feet 0.09290 Square meters Square inches 1.273 x 106 Circular mils Square inches 6.452 Square centimeters Square Kilometers 0.3861 Square miles Square meters 10.76 Square feet Square miles 640 Acres Square miles 2.590 Square kilometers Square Millimeters 1.973 x 103 Circular mils Square mils 1.273 Circular mils Tons (long) 2240 Pounds Tons (metric) 2205 Pounds Tons (short) 2000 Pounds Watts 0.05686 Btu per minute Watts 107 Ergs per sec Watts 44.26 Foot-pounds per in Watts 1.341 x 10-3 Horsepower Watts 14.34 Calories per min Watts-hours 3.412 British thermal units Watts-hours 2655 Footpounds Watts-hours 1.341 x 10-3 Horsepower-hours Watts-hours 0.8605 Kilogram-calories Watts-hours 376.1 Kilogram-meters Webers 108 Maxwells