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SI* (MODERN METRIC) CONVERSION FACTORS
APPROXIMATE CONVERSIONS TO SI UNITS
| Symbol | When You Know | Multiply By | To Find | Symbol |
|---|
| LENGTH |
|---|
| 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 |
|---|
| in2 | square inches | 645.2 | square millimeters | mm2 |
| ft2 | square feet | 0.093 | square meters | m2 |
| yd2 | square yards | 0.836 | square meters | m2 |
| Ac | acres | 0.405 | hectares | ha |
| mi2 | square miles | 2.59 | square kilometers | km2 |
| VOLUME |
|---|
| fl oz | fluid ounces | 29.57 | milliliters | ml |
| Gal | gallons | 3.785 | liters | l |
| ft33 | cubic feet | 0.028 | cubic meters | m3 |
| yd3 | cubic yards | 0.765 | cubic meters | m3 |
| MASS |
|---|
| Oz | ounces | 28.35 | grams | g |
| Lb | pounds | 0.454 | kilograms | kg |
| T | short tons (2000 lbs) | 0.907 | megagrams | Mg |
| TEMPERATURE (exact) |
|---|
| F | Fahrenheit | 5(F-32)/9 | Celsius | C |
| | temperature | or (F-32)/1.8 | temperature | |
| ILLUMINATION |
|---|
| Fc | foot-candles | 10.76 | lux | lx |
| Fl | foot-Lamberts | 3.426 | candela/m2 | cd/m2 |
| FORCE and PRESSURE or STRESS |
|---|
| 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 |
|---|
| LENGTH |
|---|
| 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 |
|---|
| mm2 | square millimeters | 0.0016 | square inches | in2 |
| m2 | square meters | 10.764 | square feet | ft2 |
| m2 | square meters | 1.195 | square yards | yd2 |
| ha | hectares | 2.47 | acres | ac |
| km2 | square kilometers | 0.386 | square miles | mi2 |
| VOLUME |
|---|
| ml | milliliters | 0.034 | fluid ounces | fl oz |
| l | liters | 0.264 | gallons | gal |
| m3 | cubic meters | 35.71 | cubic feet | ft3 |
| m3 | cubic meters | 1.307 | cubic yards | yd3 |
| MASS |
|---|
| g | grams | 0.035 | ounces | oz |
| kg | kilograms | 2.202 | pounds | lb |
| Mg | megagrams | 1.103 | short tons (2000 lbs) | T |
| TEMPERATURE (exact) |
|---|
| C | Celsius | 1.8 C + 32 | Fahrenheit | F |
| | temperature | | temperature | |
| ILLUMINATION |
|---|
| lx | lux | 0.0929 | foot-candles | fc |
| cd/m2 | candela/m2 | 0.2919 | foot-Lamberts | fl |
| FORCE and PRESSURE or STRESS |
|---|
| 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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