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Conversion Factors for SI and non-SI Units

To convert Column 1 into Column 2, multiply by   Column 1 SI Unit   Column 2 non-SI Unit   To convert Column 2 into Column 1, multiply by
Length
0.621   kilometer, km (103 m)   mile, mi   1.609
1.094   meter, m   yard, yd   0.914
3.28   meter, m   foot, ft   0.304
1.0   micrometer, µm (10-6 m)   micron, µ   1.0
3.94 x 10-2   millimeter, mm (10-3 m)   inch, in   25.4
10   nanometer, nm (10-9 m)   Angstrom, Å   0.1
Area
2.47   hectare, ha   acre   0.405
247   square kilometer, km2 (103 m)2   acre   4.05 x 10-3
0.386   square kilometer, km2 (103 m)2   square mile, mi2   2.590
2.47 x 10-4   square meter, m2   acre   4.05 x 103
10.76   square meter, m2   square foot, ft2   9.29 x 10-2
1.55 x 10-3   square millimeter, mm2 (10-3 m)2   square inch, in2   645
Volume
9.73 x 10-3   cubic meter, m3   acre-inch   102.8
35.3   cubic meter, m3   cubic foot, ft3   2.83 x 10-2
6.10 x 104   cubic meter, m3   cubic inch, in3   1.64 x 10-5
2.84 x 10-2   liter, L (10-3 m3)   bushel, bu   35.24
1.057   liter, L (10-3 m3)   quart (liquid), qt   0.946
3.53 x 10-2   liter, L (10-3 m3)   cubic foot, ft3   28.3
0.265   liter, L (10-3 m3)   gallon   3.78
33.78   liter, L (10-3 m3)   ounce (fluid), oz   2.96 x 10-2
2.11   liter, L (10-3 m3)   pint (fluid), pt   0.473
Mass
2.20 x 10-3   gram, g (10-3 kg)   pound, lb   454
3.52 x 10-2   gram, g (10-3 kg)   ounce (avdp), oz   28.4
2.205   kilogram, kg   pound, lb   0.454
0.01   kilogram, kg   quintal (metric), q   100
1.10 x 10-3   kilogram, kg   ton (2000 lb), ton   907
1.102   megagram, Mg (tonne)   ton (U.S.), ton   0.907
1.102   tonne, t   ton (U.S.), ton   0.907
Yield and Rate
0.893   kilogram per hectare, kg ha-1   pound per acre, lb acre-1   1.12
7.77 x 10-2   kilogram per cubic meter, kg m-3   pound per bushel, bu-1   12.87
1.49 x 10-2   kilogram per hectare, kg ha-1   bushel per acre, 60 lb   67.19
1.59 x 10-2   kilogram per hectare, kg ha-1   bushel per acre, 56 lb   62.71
1.86 x 10-2   kilogram per hectare, kg ha-1   bushel per acre, 48 lb   53.75
0.107   liter per hectare, L ha-1   gallon per acre   9.35
893   tonnes per hectare, t ha-1   pound per acre, lb acre-1   1.12 x 10-3
893   megagram per hectare, Mg ha-1   pound per acre, lb acre-1   1.12 x 10-3
0.446   megagram per hectare, Mg ha-1   ton (2000 lb) per acre, ton acre-1   2.24
2.24   meter per second, m s-1   mile per hour   0.447
Specific Surface
10   square meter per kilogram, m2 kg-1   square centimeter per gram, cm2 g-1   0.1
1000   square meter per kilogram, m2 kg-1   square millimeter per gram, mm2 g-1   0.001
Density
1.00   megagram per cubic meter, Mg m-3   gram per cubic centimeter, g cm-3   1.00
Pressure
9.90   megapascal, MPa (106 Pa)   atmosphere   0.101
10   megapascal, MPa (106 Pa)   bar   0.1
2.09 x 10-2   pascal, Pa   pound per square foot, lb ft-2   47.9
1.45 x 10-4   pascal, Pa   pound per square inch, lb in-2   6.90 x 103
Temperature
1.00 (K - 273)   Kelvin, K   Celsius, °C   1.00 (°C + 273)
(9/5 °C) + 32   Celsius, °C   Fahrenheit, °F   5/9 (°F - 32)
Energy, Work, Quantity of Heat
9.52 x 10-4   joule, J   British thermal unit, Btu   1.05 x 103
0.239   joule, J   calorie, cal   4.19
107   joule, J   erg   10-7
0.735   joule, J   foot-pound   1.36
2.387 x 10-5   joule per square meter, J m-2   calorie per square centimeter (langley)   4.19 x 104
105   newton, N   dyne   10-5
1.43 x 10-3   watt per square meter, W m-2   calorie per square centimeter minute (irradiance), cal cm-2 min-1   698
Transpiration and Photosynthesis
3.60 x 10-2   milligram per square meter second, mg m-2 s-1   gram per square decimeter hour, g dm-2 h-1   27.8
5.56 x 10-3   milligram (H2O) per square meter second, mg m-2 s-1   micromole (H2O) per square centimeter second, µmol cm-2 s-1   180
10-4   milligram per square meter second, mg m-2 s-1   milligram per square centimeter second, mg cm-2 s-1   104
35.97   milligram per square meter second, mg m-2 s-1   milligram per square decimeter hour, mg dm-2 h-1   2.78 x 10-2
Plane Angle
57.3   radian, rad   degrees (angle), °   1.75 x 10-2
Electrical Conductivity, Electricity, and Magnetism
10   siemen per meter, S m-1   millimho per centimeter, mmho cm-1   0.1
104   tesla, T   gauss, G   10-4
Water Measurement
9.73 x 10-3   cubic meter, m3   acre-inches, acre-in   102.8
9.81 x 10-3   cubic meter per hour, m3 h-1   cubic feet per second, ft3 s-1   101.9
4.40   cubic meter per hour, m3 h-1   U.S. gallons per minute, gal min-1   0.227
8.11   hectare-meters, ha-m   acre-feet, acre-ft   0.123
97.28   hectare-meters, ha-m   acre-inches, acre-in   1.03 x 10-2
8.1 x 10-2   hectare-centimeters, ha-cm   acre-feet, acre-ft   12.33
Concentrations
1   centimole per kilogram, cmol kg-1   milliequivalents per 100 grams, meq 100 g-1   1
0.1   gram per kilogram, g kg-1   percent, %   10
1   milligram per kilogram, mg kg-1   parts per million, ppm   1
Radioactivity
2.7 x 10-11   becquerel, Bq   curie, Ci   3.7 x 1010
2.7 x 10-2   becquerel per kilogram, Bq kg-1   picocurie per gram, pCi g-1   37
100   gray, Gy (absorbed dose)   rad, rd   0.01
100   sievert, Sv (equivalent dose)   rem (roentgen equivalent man)   0.01
Plant Nutrient Conversion
    Elemental   Oxide    
2.29   P   P2O5   0.437
1.20   K   K2O   0.830
1.39   Ca   CaO   0.715
1.66   Mg   MgO   0.602

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