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| Use this table to convert from units commonly used in Canada and the U.S.A. to the internationally
recognized SI Units. |
| Unit | Multiply by | SI Unit |
| Length |
| inch | 2.54 | centimetres(cm)(10-2m) |
| foot | 0.304 | metre, m |
| mile | 1.609 | kilometre, km(103 m) |
| micron, | 1.0 | micrometre, m(10-6m) |
| Angstrom unit | 0.1 | nanometre, nm(10-9m) |
| Area |
| acre | 4840 | yards2 |
| acre | 0.4047 | hectare, ha(104m2) |
| section (640 ac) | 2.59 | km,2 |
| township (36 sections) | 9324 | ha |
| square foot | 9.29*10-2 | square metre, m2 |
| square inch | 645 | square millimetre, mm2 |
| square mile | 2.59 | square kilometre, km2 |
| Volume |
| bushel | 35.24 | litre, L |
| cubic foot | 2.83*10-2 | cubic metre, m3 |
| cubic inch | 1.64*10-5 | cubic metre, m3 |
| gallon (Can.) | 4.73 | litre, L |
| gallon (U.S.) | 3.78 | litre, L |
| quart (Can) | 1.18 | litre, L |
| pint (Can) | 0.591 | litre, L |
| acre-foot | 12.33 | hectare-centimetre, ha-cm |
| acre-inch | 1.03*10-2 | hectare-metres, ha-m |
| ounce (fluid) | 2.96*10-2 | litre, L | |
| Mass |
| ounce (avdp) | 28.4 | gram |
| pound | 0.454 | kilogram, kg(103g) |
| hundred weight (cwt) 100 pounds | 45.3549 | kg |
| ton (2000 lb) | 0.907 | megagram, Mg(106g) |
| tonne (metric) | 1000 | kilogram, kg |
| Radioactivity |
| curie, Ci | 3.7*1010 | becquerel, Bq |
| picocurie per gram | 37 | becquerel per kilogram, Bq kg-1 |
| Yield |
| bushel per acre (60 lb) | 67.19 | kilogram per ha, kg ha-1 |
| bushel per acre (56 lb) | 62.71 | kilogram per ha, kg ha-1 |
| bushel per acre (48 lb) | 53.75 | kilogram per ha, kg ha-1 |
| gallon per acre (Can) | 11.69 | litre per hectare, L ha-1 |
| ton (2000 lb) per acre | 2.24 | megagram per hectare, Mg ha-1 |
| Bushel Equivalents |
| Wheat | 36.744 | tonne |
| Oats | 64.842 | tonne |
| Barley | 45.930 | tonne |
| Rye | 39.368 | tonne |
| Flaxseed | 39.368 | tonne |
| Canola/Mustard | 44.092 | tonne |
| Peas | 36.744 | tonne |
| Rate |
| miles per hour | 0.447 | metre per second, m s-1 |
| gallon per minute (Can.) | 0.284 | cubic metre per hour, m3 h-1 |
| gallon per minute (U.S.) | 0.227 | cubic metre per hour, m3 h-1 |
| cubic feet per second | 101.9 | cubic metre per hour, m3 h-1 |
| Pressure |
| atmosphere | 0.101 | megapascal, MPa(106 Pa) |
| bar | 0.1 | megapascal, MPa |
| pound per square foot | 47.9 | pascal, Pa |
| pound per square inch | 6.9*103 | pascal, Pa |
| Temperature |
| degrees Fahrenheit (¡F-32) | 0.556 | degrees, ¡C |
| degrees Celsius (¡C+273) | 1 | Kelvin, K |
| Energy |
| British Thermal Unit | 1.05*103 | joule, J |
| calorie | 4.19 | joule, J |
| dyne | 10-5 | newton, N |
| erg | 10-7 | joule, J |
| foot-pound | 1.36 | joule, J |
| Concentrations |
| percent (%) | 10 | gram per kilogram g kg-1 |
| part per million | 1 | milligram per kilogram, mg kg-1 |
| milliequivalents per 100 grams | 1 | centimole per kilogram, cmol kg-1 |
| Special Chemical Equivalents |
| 2 meq K+ per 100 g | | 2 mmol (K+).kg-1 soil |
| 2 meq Ca++ per 100 g | | 2 mmol (1/2Ca++).kg-1 soil |
| 2 meqAl+++ per 100 g | | 2 mmol (1/3Al+++).kg-1 soil |
| CEC of 12 meq per 100g soil | | CEC of 120 mmols (+).kg-1 soil |
| 0.2 M HCl | | 0.2 mol.L-1 |
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