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SI* (MODERN METRIC) CONVERSION FACTORS
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APPROXIMATE CONVERSIONS TO SI UNITS | Symbol | When You Know | Multiply By | To Find | Symbol |
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| LENGTH |
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| In | inches | 25.4 | millimeters | mm | | Ft | feet | 0.305 | meters | m | | Yd | yards | 0.914 | meters | m | | Mi | miles | 1.61 | kilometers | km | | AREA |
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| in 2 | square inches | 645.2 | square millimeters | mm 2 | | ft 2 | square feet | 0.093 | square meters | m 2 | | yd 2 | square yards | 0.836 | square meters | m 2 | | Ac | acres | 0.405 | hectares | ha | | mi 2 | square miles | 2.59 | square kilometers | km 2 | | VOLUME |
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| fl oz | fluid ounces | 29.57 | milliliters | ml | | Gal | gallons | 3.785 | liters | l | | ft 3 3 | cubic feet | 0.028 | cubic meters | m 3 | | yd 3 | cubic yards | 0.765 | cubic meters | m 3 | | MASS |
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| Oz | ounces | 28.35 | grams | g | | Lb | pounds | 0.454 | kilograms | kg | | T | short tons (2000 lbs) | 0.907 | megagrams | Mg | | TEMPERATURE (exact) |
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| F | Fahrenheit | 5(F-32)/9 | Celsius | C | | | temperature | or (F-32)/1.8 | temperature | | | ILLUMINATION |
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| Fc | foot-candles | 10.76 | lux | lx | | Fl | foot-Lamberts | 3.426 | candela/m2 | cd/m2 | | FORCE and PRESSURE or STRESS |
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| Lbf | pound-force | 4.45 | newtons | N | | Psi | pound-force per square inch | 6.89 | kilopascals | kPa |
APPROXIMATE CONVERSIONS FROM SI UNITS | Symbol | When You Know | Multiply By | To Find | Symbol |
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| LENGTH |
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| mm | millimeters | 0.039 | inches | in | | m | meters | 3.28 | feet | ft | | m | meters | 1.09 | Yards | yd | | km | kilometers | 0.621 | miles | mi | | AREA |
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| mm 2 | square millimeters | 0.0016 | square inches | in2 | | m 2 | square meters | 10.764 | square feet | ft 2 | | m 2 | square meters | 1.195 | square yards | yd 2 | | ha | hectares | 2.47 | acres | ac | | km 2 | square kilometers | 0.386 | square miles | mi 2 | | VOLUME |
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| ml | milliliters | 0.034 | fluid ounces | fl oz | | l | liters | 0.264 | gallons | gal | | m 3 | cubic meters | 35.71 | cubic feet | ft 3 | | m 3 | cubic meters | 1.307 | cubic yards | yd 3 | | MASS |
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| g | grams | 0.035 | ounces | oz | | kg | kilograms | 2.202 | pounds | lb | | Mg | megagrams | 1.103 | short tons (2000 lbs) | T | | TEMPERATURE (exact) |
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| C | Celsius | 1.8 C + 32 | Fahrenheit | F | | | temperature | | temperature | | | ILLUMINATION |
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| lx | lux | 0.0929 | foot-candles | fc | | cd/m2 | candela/m2 | 0.2919 | foot-Lamberts | fl | | FORCE and PRESSURE or STRESS |
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| N | newtons | 0.225 | pound-force | lbf | | kPa | kilopascals | 0.145 | pound-force per square inch | psi |
* SI is the symbol for the International System of Units. Appropriate rounding should be made to comply with Section 4 of ASTM E380.
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