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

 

Download a PDF of Fluid Power Design Data Sheet 25 - Interchange Between SI, Metric and U.S. Customary Units.

© 1990 by Womack Machine Supply Co. This company assumes no liability for errors in data nor in safe and/or satisfactory operation of equipment designed from this information.

Web Statistics