Commonly Used Conversion Factors
| 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 |
| Multiply: |
By: |
To Obtain: |
| 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 |
| Multiply: |
By: |
To Obtain: |
| 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 |
| Multiply: |
By: |
To Obtain: |
| 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 |
| Multiply: |
By: |
To Obtain: |
| 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 |
| Multiply: |
By: |
To Obtain: |
| 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 |
| Multiply: |
By: |
To Obtain: |
| 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 |
| Multiply: |
By: |
To Obtain: |
| 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 |
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