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SI* (Modern Metric) Conversion Factors

APPROXIMATE CONVERSIONS TO SI UNITS
SYMBOL WHEN YOU KNOW MULTIPLY BY TO FIND SYMBOL

LENGTH

in
inches 25.4 millimeters mm
ft
feet 0.305 meters m
yd
yards 0.914 meters m
mi
miles 1.61 kilometers km

AREA

in2
square inches 645.2 square millimeters mm2
ft2
square feet 0.093 square meters m2
yd2
square yard 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
ft3
cubic feet 0.028 cubic meters m3
yd3
cubic yards 0.765 cubic meters m3

NOTE: volumes greater than 1000 L shall be shown in m3

MASS

oz
ounces 28.35 grams g
lb
pounds 0.454 kilograms kg
T
short tons (2000 lb) 0.907 megagrams (or "metric ton") Mg (or "t")
TEMPERATURE (exact degrees)
oF
Fahrenheit

5 (F-32)/9
or (F-32)/1.8

Celsius oC

ILLUMINATION

fc
foot-candles 10.76 lux lx
fl
foot-Lamberts 3.426 candela/m2 cd/m2

FORCE and PRESSURE or STRESS

lbf
poundforce   4.45   newtons N
lbf/in2
poundforce per square inch 6.89 kilopascals kPa

 

APPROXIMATE CONVERSIONS FROM SI UNITS
SYMBOL WHEN YOU KNOW MULTIPLY BY TO FIND SYMBOL

LENGTH

mm
millimeters

0.039

inches in
m
meters

3.28

feet ft
m
meters

1.09

yards yd
km
kilometers

0.621

miles mi

AREA

mm2
square millimeters

0.0016

square inches in2
m2
square meters

10.764

square feet ft2
m2
square meters

1.195

square yards yd2
ha
hectares

2.47

acres ac
km2
square kilometers

0.386

square miles mi2

VOLUME

mL
milliliters

0.034

fluid ounces fl oz
L
liters

0.264

gallons gal
m3
cubic meters

35.314

cubic feet ft3
m3
cubic meters

1.307

cubic yards yd3

MASS

g
grams

0.035

ounces oz
kg
kilograms

2.202

pounds lb
Mg (or "t")
megagrams (or "metric ton")

1.103

short tons (2000 lb) T

TEMPERATURE (exact degrees)

oC
Celsius 1.8C+32 Fahrenheit oF

ILLUMINATION

lx
lux

0.0929

foot-candles fc
cd/m2
candela/m2

0.2919

foot-Lamberts fl

FORCE and PRESSURE or STRESS

N
newtons 0.225 poundforce lbf
kPa
kilopascals

0.145

poundforce per square inch lbf/in2

*SI is the symbol for the International System of Units. Appropriate rounding should be made to comply with Section 4 of ASTM E380. (Revised March 2003)

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