# Interchange Between SI, Metric and U.S. Customary Units

## FLUID POWER - Design Data Sheet 25

International Standard (SI) units are shown in the first column of each chart. Values with exponents can be handled directly on a pocket calculator which has exponent key.

For manual calculations, remember that the + or - sign in front of an exponent tells whether to move the decimal to the right (for a + sign), or to the left (for a - sign), and how far to move it. Examples: 2.540 × 10-5 = .0000254, and 3.048 × 102 = 304.8, etc.

Equivalent values of all units are shown on the same line. The easiest way to use the chart is to look down the column of the unit to be converted and find the line on which the "1" appears. Then move to the left or right to the column of the desired new unit. That figure is a multiplier.

Example: Look down the "Inch" column to the "1" line. The chart shows 1 inch = 1.578 × 10-5 mile. Therefore, 627 inches would be: 627 × [1.578 × 10-5] miles, etc.

 LENGTH (Linear Measurement) Meter Centimeter Millimeter Kilometer Mile Inch Foot 1 100 1,000 1 × 10-3 6.214 × 10-4 39.370 3.281 0.01 1 10 1 × 10-5 6.214 × 10-6 3.937 × 10-1 3.281 × 10-2 1 × 10-3 0.10 1 1 × 10-6 6.214 × 10-7 3.937 × 10-2 3.281 × 10-3 1 × 103 1 × 105 1 × 106 1 6.214 × 10-1 3.937 × 104 3.281 × 103 1.609 × 103 1.609 × 105 1.609 × 106 1.609 1 6.336 × 104 5,280 2.540 × 10-2 2.540 25.40 2.540 × 10-5 1.578 × 10-5 1 8.333 × 10-2 3.048 × 10-1 30.479 3.048 × 102 3.048 × 10-4 1.894 × 10-4 12 1

 AREA (Square Measurement) Square Meter Square Centimeter Square Millimeter Square Kilometer Square Inch Square Foot Square Mile 1 1 × 104 1 × 106 1 × 10-6 1.550 × 103 10.764 3.861 × 10-7 1 × 10-4 1 100 1 × 10-10 1.550 × 10-1 1.076 × 10-3 3.681 × 10-11 1 × 10-6 1 × 10-2 1 1 × 10-12 1.550 × 10-3 1.076 × 10-5 3.681 × 10-13 1 × 106 1 × 10-10 1 × 1012 1 1.550 × 109 1.076 × 107 3.861 × 10-1 6.452 × 10-4 6.452 6.452 × 102 6.452 × 10-10 1 6.944 × 10-3 2.491 × 10-10 9.290 × 10-2 9.290 × 102 9.290 × 104 9.290 × 10-8 144 1 3.587 × 10-8 2.590 × 106 2.590 × 1010 2.590 × 1012 2.590 4.014 × 109 2.788 × 107 1

 VOLUME (Cubic) Cubic Meter Cubic Decimeter (Liter) Cubic Centimeter Imperial Gallon U.S. Gallon Cubic Inch Cubic Foot 1 1 x 103 1 x 106 2.20 x 102 2.642 x 102 6.102 x 104 35.314 1 × 10-3 1 1 x 103 2.20 x 10-1 2.642 x 10-1 61.204 3.531 x 10-2 1 × 10-6 1 x 10-3 1 2.20 x 10-4 2.642 x 10-4 6.102 x 10-2 3.531 x 10-5 4.546 × 10-3 4.546 4.546 x 103 1 1.200 2.774 x 102 1.605 x 10-1 3.785 × 10-3 3.785 3.785 x 103 8.327 x 10-1 1 2.310 x 102 1.337 x 10-1 1.639 × 10-5 1.639 x 10-2 16.387 3.605 x 10-3 4.329 x 10-3 1 5.787 x 10-4 2.832 × 10-2 28.317 2.832 x 104 6.229 7.481 1.728 x 103 1

 FORCE (Including Force Due to Weight) Newton (Joules/Meter) Dyne Kilopond Metric Ton Long Ton U.S. Ton Pound 1 1 × 105 1.020 × 10-1 1.020 × 10-4 1.004 × 10-4 1.124 × 10-4 2.248 × 10-1 1 × 10-5 1 1.020 × 10-6 1.020 × 10-9 1.004 × 10-9 1.124 × 10-9 2.248 × 10-6 9.807 9.807 × 105 1 1 × 10-3 9.842 × 10-4 1.102 × 10-3 2.205 9.807 × 103 9.807 × 108 1,000 1 9.842 × 10-1 1.102 2.205 × 103 9.964 × 103 9.964 × 108 1.016 × 103 1.016 1 1.120 2.240 × 103 8.896 × 103 8.896 × 108 9.072 × 102 9.072 × 10-1 8.929 × 10-1 1 2,000 4.448 4.448 × 105 4.536 × 10-1 4.536 × 10-4 4.464 × 10-4 5 × 10-4 1

 MASS (Not Weight) Kilogram Gram Metric Ton Newton Joules/Meter Pound Slug U.S. Ton 1 1,000 1 × 10-3 9.807 2.205 6.853 × 10-2 1.102 × 10-3 1 × 10-3 1 1 × 10-6 9.087 × 10-3 2.205 × 10-3 6.853 × 10-5 1.102 × 10-6 1 × 103 1 × 106 1 9.087 × 103 2.205 × 103 68.530 1.102 1.020 × 10-1 1.020 × 102 1.020 × 10-4 1 2.248 × 10-1 6.988 × 10-3 1.124 × 10-4 4.536 × 10-1 4.536 × 102 4.536 × 10-4 4.448 1 3.108 × 10-2 5 × 10-4 14.594 1.459 × 104 1.459 × 10-2 1.431 × 102 32.170 1 1.609 × 10-2 9.072 × 102 9.072 × 105 9.072 × 10-1 8.896 × 103 2,000 62.170 1

 VELOCITY Meters per Second Decimeters per Minute Kilometers per Hour Miles per Hour Feet per Minute Feet per Second Inches per Minute 1 600 3.6 2.237 1.968 × 102 3.281 2.362 × 103 1.667 × 10-3 1 6 × 10-3 3.728 × 10-3 3.281 × 10-1 5.468 × 10-3 3.937 2.778 × 10-1 16.667 1 6.214 × 10-1 54.680 9.113 × 10-1 6.562 × 102 4.470 × 10-1 167 1.609 1 88 1.467 1.056 × 103 5.080 × 10-3 3.048 1.829 × 10-2 1.136 × 10-2 1 1.667 × 10-2 12 3.048 × 10-1 1.829 × 102 1.097 6.818 × 10-1 60 1 7.2 × 102 4.233 × 10-4 2.540 × 10-1 1.524 × 10-3 9.470 × 10-4 8.333 × 10-2 1.389 × 10-3 1

 UNIT PRESSURE (Either Fluid or Mechanical) Bar Newtons per M2 (Pascal) Kilopond per M2 Kilopond per Cm2 Atmosphere Pounds per Ft2 Pounds per Inch2 1 × 10-5 1 1.020 × 10-1 1.020 × 10-5 9.869 × 10-6 2.088 × 10-2 1.45 × 10-4 1 1 × 105 1.020 × 104 1.020 9.869 × 10-1 2.088 × 103 14.5 9.807 × 10-5 9.807 1 1 × 10-4 8.678 × 10-5 2.048 × 10-1 1.422 × 10-3 9.807 × 10-1 9.807 × 104 1 × 104 1 9.678 × 10-1 2.048 × 103 14.220 1.013 1.013 × 105 1.033 × 104 1.033 1 2.116 × 103 14.693 4.789 × 10-4 47.893 4.884 4.884 × 10-4 4.726 × 10-4 1 6.944 × 10-3 6.897 × 10-2 6.897 × 103 7.033 × 102 7.033 × 10-2 6.806 × 10-2 1.440 × 102 1

 POWER Kilowatt Watt, Joules/Sec. and N-M/Sec U.S. and U.K Horsepower Foot-Pounds per Minute Foot-Pounds per Second BTU per Hour BTU per Minute 1 1,000 1.340 4.425 × 104 7.376 × 102 3.412 × 103 56.862 1 × 10-3 1 1.340 × 10-3 44.254 7.376 × 10-1 3.412 5.686 × 10-2 7.641 × 10-1 746 1 3.300 × 104 5.500 × 102 2.545 × 103 42.44 2.260 × 10-5 2.260 × 10-2 3.029 × 10-5 1 1.667 × 10-2 7.710 × 10-2 1.285 × 10-3 1.356 × 10-3 1.356 1.817 × 10-3 60 1 4.626 7.710 × 10-2 2.931 × 10-4 2.931 × 10-1 3.928 × 10-4 12.971 2.162 × 10-1 1 1.667 × 10-2 1.759 × 10-2 17.586 2.357 × 10-2 7.783 × 102 12.971 60 1

 ENERGY OR WORK Kilowatt- Hour Watt-Second Joule, or N-m Dyne-Centimeter or Erg Horsepower- Hour Foot- Pound Inch- Pound BTU 1 3.6 × 106 3.6 × 1013 1.341 2.655 × 106 3.187 × 107 3.412 × 103 2.778 × 10-7 1 1 × 107 3.725 × 10-7 7.376 × 10-1 8.851 9.477 × 10-4 2.778 × 10-14 1 × 10-7 1 3.725 × 10-14 7.376 × 10-8 8.851 × 10-7 9.477 × 10-11 7.457 × 10-1 2.685 × 106 2.685 × 1013 1 1.980 × 106 2.376 × 107 2.544 × 103 3.766 × 10-7 1.356 1.356 × 107 5.051 × 10-7 1 12 1.285 × 10-3 3.138 × 10-8 1.130 × 10-1 1.130 × 106 4.209 × 10-8 8.333 × 10-2 1 1.071 × 10-4 2.931 × 10-4 1.055 × 103 1.055 × 1010 3.931 × 10-4 7.783 × 102 9.339 × 103 1

 ENERGY OR WORK Newton- Meters Kilopond- Meters Foot-Pounds Inch-Pounds 1 1.020 × 10-1 7.376 × 10-1 8.851 9.807 1 7.233 86.60 1.356 1.382 × 10-1 1 12 1.130 × 10-1 1.152 × 10-2 8.333 × 10-2 1

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