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SI* (Modern Metric) Conversion Factors

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

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

in2

square inches

645.2

square millimeters

mm2

ft2

square feet

0.093

square meters

m2

yd2

square yards

0.836

square meters

m2

ac

acres

0.405

hectares

ha

mi2

square miles

2.59

square kimlometers

km2

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

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

mL

milliliters

0.034

fluid ounces

fl oz

L

liters

0.264

gallons

gal

m3

cubic meters

35.71

cubic feet

ft3

m3

cubic meters

1.307

cubic yards

yd3

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")

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)

°F

Fahrenheit temperature

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

Celcius temperature

°C

°C

Celcius temperature

1.8C + 32

Fahrenheit temperature

°F

ILLUMINATION

fc

foot-candles

10.76

lux

lx

fl

foot-Lamberts

3.426

candela/m2

cd/m2

lx

lux

0.0929

foot-candles

fc

cd/m2

candela/m2

0.2919

foot-Lamberts

fl

FORCE and PRESSURE or STRESS

lbf

poundforce

4.45

newtons

N

lbf/in2

poundforce per square inch

6.89

kilopascals

kPa

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.

 

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