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OCR for page 37
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
