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38 APPROXIMATE CONVERSIONS TO SI UNITS APPROXIMATE CONVERSIONS FROM SI UNITS Symbol When YouKnow Multiply By To Find Symbol Symbol When You Know Multiply By To Find Symbol LENGTH LENGTH in inches 25.4 millimeters millimeters 0.039 inches in ft feet 0.305 meters meters 3.28 feet ft yd yards 0.914 meters meters 1.09 yards d mi miles 1.61 kilometers km km kilometers 0.621 miles y mi AREA AREA in2 square inches 645.2 square millimeters mm 2 mm2 mmmm mm mm square millimeters 0.0016 square inches in 2 ft2 square feet 0.093 square meters m2 m2 square meters 10.764 square feet ft2 yd2 square yards 0.836 square meters m 2 m2 square meters 1.195 square yards d2 ac acres 0.405 Hectares ha ha hectares 2.47 acres ac mi2 square miles 2.59 square kilometers km 2 km2 square kilometers 0.386 square miles i 2 VOLUME VOLUME fl oz fluid ounces 29.57 milliliters mlml illiliters .034 fluid ounces fl oz gal gallons 3.785 liters ll liters m 0 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 y m yd3 MASS MASS oz ounces 28.35 grams gg grams 0.035 ounces oz lb pounds 0.454 kilograms ilograms pounds lb T short tons (2000 lbs) 0.907 megagrams kg Mg kg Mg k 2.202 megagrams 1.103 short tons (2000 lbs) T TEMPERATURE (exact) TEMPERATURE (exact) °F Fahrenheit 5(F-32)/9 Celsius °C °C Celsius 1.8 C + 32 Fahrenheit °F 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 lbf pound-force 4.45 Newtons NN Newtons 0.225 pound-force lbf psi pound- force per square inch 6.89 Kilopascals kPa kPa kilopascals 0.145 pound-forceper 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 SI (MODERN METRIC) CONVERSION FACTORS
