Contract Related Forms and Publications
SI* (MODERN METRIC) Conversion Factors
APPROXIMATE CONVERSIONS TO SI UNITS
SYMBOL | WHEN YOU KNOW | MULTIPLY BY | TO FIND | SYMBOL | SYMBOL | WHEN YOU KNOW | MULTIPLY BY | TO FIND | SYMBOL |
LENGTH |
in | inches | 25.4 | millimeters | mm | mm | millimeters | 0.039 | inches | in |
ft | feet | 0.305 | meters | m | m | meters | 3.28 | feet | ft |
yd | yards | 0.914 | meters | m | m | meters | 1.09 | yards | yd |
mi | miles | 1.61 | kilometers | km | km | kilometers | 0.621 | miles | mi |
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SYMBOL | WHEN YOU KNOW | MULTIPLY BY | TO FIND | SYMBOL | SYMBOL | WHEN YOU KNOW | MULTIPLY BY | TO FIND | SYMBOL |
AREA |
in2 | square inches | 645.2 | square millimeters | mm2 | mm2 | square millimeters | 0.0016 | square inches | in2 |
ft2 | square feet | 0.093 | square meters | m2 | m2 | square meters | 10.764 | square feet | ft2 |
yd2 | square yard | 0.836 | square meters | m2 | m2 | square meters | 1.195 | square yards | yd2 |
ac | acres | 0.405 | hectares | ha | ha | hectares | 2.47 | acres | ac |
mi2 | square miles | 2.59 | square kilometers | km2 | km2 | square kilometers | 0.386 | square miles | mi2 |
SYMBOL | WHEN YOU KNOW | MULTIPLY BY | TO FIND | SYMBOL | SYMBOL | WHEN YOU KNOW | MULTIPLY BY | TO FIND | SYMBOL |
VOLUME |
fl oz | fluid ounces | 29.57 | milliliters | mL | mL | milliliters | 0.034 | fluid ounces | fl oz |
gal | gallons | 3.785 | liters | L | L | liters | 0.264 | gallons | gal |
ft3 | cubic feet | 0.028 | cubic meters | m3 | m3 | cubic meters | 35.314 | cubic feet | ft3 |
yd3 | cubic yards | 0.765 | cubic meters | m3 | m3 | cubic meters | 1.307 | cubic yards | yd3 |
SYMBOL | WHEN YOU KNOW | MULTIPLY BY | TO FIND | SYMBOL | SYMBOL | WHEN YOU KNOW | MULTIPLY BY | TO FIND | SYMBOL |
MASS |
oz | ounces | 28.35 | grams | g | g | grams | 0.035 | ounces | oz |
lb | pounds | 0.454 | kilograms | kg | kg | kilograms | 2.202 | pounds | lb |
T | short tons (2000 lb) | 0.907 | megagrams (or "metricton") | Mg (or "t") | Mg (or "t") | megagrams (or "metric ton") | 1.103 | short tons (2000 lb) | T |
SYMBOL | WHEN YOU KNOW | MULTIPLY BY | TO FIND | SYMBOL | SYMBOL | WHEN YOU KNOW | MULTIPLY BY | TO FIND | SYMBOL |
TEMPERATURE (exact degrees) |
°F | Fahrenheit | 5 (F-32)/9 or (f-32)/1.8 | Celsius | °C | °C | Celsius | 1.8C+32 | Fahrenheit | °F |
SYMBOL | WHEN YOU KNOW | MULTIPLY BY | TO FIND | SYMBOL | SYMBOL | WHEN YOU KNOW | MULTIPLY BY | TO FIND | SYMBOL |
ILLUMINATION |
fc | foot-candles | 10.76 | lux | lx | lx | lux | 0.0929 | foot-candles | fc |
fl | foot-Lamberts | 3.426 | candela/m2 | cd/m2 | cd/m2 | candela/m2 | 0.2919 | foot-Lamberts | fl |
SYMBOL | WHEN YOU KNOW | MULTIPLY BY | TO FIND | SYMBOL | SYMBOL | WHEN YOU KNOW | MULTIPLY BY | TO FIND | SYMBOL |
FORCE and PRESSURE or STRESS |
lbf | poundforce | 4.45 | newtons | N | N | newtons | 0.225 | poundforce | lbf |
lbf/in2 | poundforce per square inch | 6.89 | kilopascals | kPa | kPa | kilopascals | 0.145 | poundforce per square inch | lbf/in2 |
NOTE: volumes greater than 1000 L shall be shown in m3
*SI is the symbol for the International System of Units. Appropriate rounding should be made to comply with Section 4 of ASTM E380.
(Revised March 2003)