APPROXIMATE CONVERSIONS TO SI UNITS APPROXIMATE CONVERSIONS FROM SI UNITS
Symbol When You Know Multiply By To Find Symbol When You Know Multiply By To Find Symbol
LENGTH LENGTH
in inches 25.4 millimeters mm millimeters 0.039 inches in
ft feet 0.305 meters m meters 3.28 feet ft
yd yards 0.914 meters m meters 1.09 yards yd
mi miles 1.61 kilometers km kilometers 0.621 miles mi
AREA AREA
in2 square inches 645.2 square millimeters mm2 square millimeters 0.0016 square inches in2
ft2 square feet 0.093 square meters m2 square meters 10.764 square feet ft2
yd2 square yards 0.836 square meters m2 square meters 1.195 square yards ac
ac acres 0.405 hectares ha hectares 2.47 acres mi2
mi2 square miles 2.59 square kilometers km2 square kilometers 0.386 square miles  
VOLUME VOLUME
fl oz fluid ounces 29.57 milliliters ml milliliters 0.034 fluid ounces fl oz
gal gallons 3.785 liters l liters 0.264 gallons gal
ft3 cubic feet 0.028 cubic meters m3 cubic meters 35.71 cubic feet ft3
yd3 cubic yards 0.765 cubic meters m3 cubic meters 1.307 cubic yard yd3
NOTE: Volumes greater than 1000 l shall be shown in m3  
MASS MASS
oz ounces 28.35 grams g grams 0.035 ounces oz
lb pounds 0.454 kilograms kg kilograms 2.202 pounds lb
T short tons (2000 lb) 0.907 megagrams Mg megagrams 1.103 short tons (2000 lb) T
TEMPERATURE(exact) TEMPERATURE(exact)
°F Fahrenheit temperature 5(F-32)/9 or (F-32)/1.8 Celcius temperature °C Celcius temperature 1.8C +32 Fahrenheit temperature °F
ILLUMINATION ILLUMINATION
fc foot-candles 10.76 lux l lux 0.0929 foot-candles fc
fl foot-Lamberts 3.426 candela/m2 cd/m2 candela/m2 0.2919 foot-Lamberts fl
FORCE and PRESSURE or STRESS FORCE and PRESSURE or STRESS
lbg poundforce 4.45 newtons N newtons 0.225 poundforce lbf
psi poundforce per square inch 6.89 kilopascals kPa kilopascals 0.145 poundforce per square inch psi


*SI is the symbol for the International System of Units. Approximate rounding should be made to comply with Section 4 of ASTM E380.

Use of SI units is encouraged with Part VI. Future editions of Part VI will use only SI units. The conversions will be based primarily on AASHTO guides. Specific conversion of standards will be subjected to the FEDERAL REGISTER rulemaking process.

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