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38 SI (MODERN METRIC) CONVERSION FACTORS APPROXIMATE CONVERSIONS TO SI UNITS APPROXIMATE CONVERSIONS FROM SI UNITS When You Multiply When You Multiply Symbol To Find Symbol Symbol To Find Symbol Know By Know By LENGTH 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 AREA AREA square square square in2 645.2 mm2 mm2 0.0016 square inches in2 inches millimeters millimeters ft2 square feet 0.093 square meters m2 m2 square meters 10.764 square feet ft2 2 square 2 2 yd 0.836 square meters m m square meters 1.195 square yards yd2 yards ac acres 0.405 Hectares ha ha hectares 2.47 acres ac 2 square square 2 2 square mi 2.59 km km 0.386 square miles m i2 miles kilometers kilometers VOLUME VOLUME fluid fl oz 29.57 milliliters ml ml m illiliters 0.034 fluid ounces fl oz ounces gal gallons 3.785 liters l l liters 0.264 gallons gal ft3 cubic feet 0.028 cubic meters m3 m3 cubic meters 35.71 cubic feet ft3 yd3 cubic yards 0.765 cubic meters m3 m3 cubic meters 1.307 cubic yards yd3 MASS 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 short tons short tons T 0.907 megagrams Mg Mg megagrams 1.103 T (2000 lbs) (2000 lbs) TEMPERATURE (exact) TEMPERATURE (exact) 1.8 C + °F Fahrenheit 5(F-32)/9 Celsius °C °C Celsius Fahrenheit °F 32 temperature or (F-32)/1.8 Temperature temperature temperature ILLUMINATION 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 FORCE and PRESSURE or STRESS FORCE and PRESSURE or STRESS pound- lbf 4.45 Newtons N N Newtons 0.225 pound-force lbf force pound- force pound-force psi 6.89 Kilopascals kPa kPa kilopascals 0.145 psi per square per square inch inch *SI is the symbol for the International System of Units. Appropriate rounding should be made to comply with section 4 of ASTM E380