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Technical Report Documentation Page

SI* (MODERN METRIC) CONVERSION FACTORS

APPROXIMATE CONVERSIONS TO SI UNITS

SymbolWhen You KnowMultiply ByTo FindSymbol
LENGTH
In inches 25.4 millimetersmm
Ftfeet 0.305 meters m
Yd yards 0.914 metersm
Mi miles 1.61 kilometerskm
AREA
in2 square inches 645.2 square millimeters mm2
ft2 square feet0.093 square meters m2
yd2 square yards 0.836 square meters m2
Ac acres 0.405 hectares ha
mi2 square miles 2.59 square kilometers km2
VOLUME
fl oz fluid ounces 29.57 milliliters ml
Gal gallons 3.785 liters l
ft33 cubic feet 0.028 cubic meters m3
yd3 cubic yards 0.765 cubic meters m3
MASS
Oz ounces 28.35 grams g
Lb pounds 0.454 kilograms kg
T short tons (2000 lbs) 0.907 megagrams Mg
TEMPERATURE (exact)
F Fahrenheit 5(F-32)/9 Celsius C
  temperature or (F-32)/1.8 temperature  
ILLUMINATION
Fc foot-candles 10.76 lux lx
Fl foot-Lamberts 3.426 candela/m2 cd/m2
FORCE and PRESSURE or STRESS
Lbf pound-force 4.45 newtons N
Psi pound-force per square inch 6.89 kilopascals kPa

APPROXIMATE CONVERSIONS FROM SI UNITS

SymbolWhen You KnowMultiply ByTo FindSymbol
LENGTH
mmmillimeters0.039inchesin
mmeters3.28feet ft
mmeters1.09Yardsyd
kmkilometers0.621milesmi
AREA
mm2 square millimeters 0.0016 square inchesin2
m2 square meters10.764square feet ft2
m2 square meters 1.195 square yards yd2
ha hectares2.47acresac
km2 square kilometers0.386 square milesmi2
VOLUME
mlmilliliters 0.034 fluid ounces fl oz
lliters 0.264 gallons gal
m3 cubic meters 35.71cubic feet ft3
m3cubic meters 1.307 cubic yards yd3
MASS
g grams 0.035ouncesoz
kg kilograms2.202 poundslb
Mgmegagrams1.103short tons (2000 lbs) T
TEMPERATURE (exact)
C Celsius1.8 C + 32 Fahrenheit F
  temperature   temperature  
ILLUMINATION
lxlux 0.0929 foot-candles fc
cd/m2 candela/m20.2919 foot-Lamberts fl
FORCE and PRESSURE or STRESS
Nnewtons0.225pound-forcelbf
kPa kilopascals0.145pound-force per square inchpsi

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

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