SI* (Modern Metric) Conversion Factors

in

inches

25.4

millimeters

mm

ft

feet

0.305

meters

m

yd

yards

0.914

mi

miles

1.61

kilometers

km

0.039

3.28

1.09

0.621

in^{2}

square inches

645.2

square millimeters

mm^{2}

ft^{2}

square feet

0.093

square meters

m^{2}

yd^{2}

square yards

0.836

ac

acres

0.405

hectares

ha

mi^{2}

square miles

2.59

square kimlometers

km^{2}

0.0016

10.764

1.195

2.47

square kilometers

0.386

fl oz

fluid ounces

29.57

milliliters

mL

gal

gallons

3.785

liters

L

ft^{3}

cubic feet

0.028

cubic meters

m^{3}

yd^{3}

cubic yards

0.765

0.034

0.264

35.71

1.307

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")

0.035

2.202

1.103

°F

Fahrenheit temperature

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

Celcius temperature

°C

1.8C + 32

fc

foot-candles

10.76

lux

lx

fl

foot-Lamberts

3.426

candela/m^{2}

cd/m^{2}

0.0929

0.2919

lbf

poundforce

4.45

newtons

N

lbf/in^{2}

poundforce per square inch

6.89

kilopascals

kPa

0.225

0.145

*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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