| SI* (Modern Metric) Conversion Factors |
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|---|---|---|---|---|
Symbol |
When You Know |
Multiply By |
To Find |
Symbol |
| LENGTH |
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| 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 |
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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 |
g |
grams |
0.035 |
ounces |
oz |
kg |
kilograms |
2.202 |
pounds |
lb |
Mg |
megagrams (or "metric ton") |
1.103 |
short tons (2000 lb) |
T |
| TEMPERATURE (exact) |
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°F |
Fahrenheit temperature |
5(F-32)/9 or |
Celcius temperature |
°C |
°C |
Celcius temperature |
1.8C + 32 |
Fahrenheit temperature |
°F |
| ILLUMINATION |
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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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