Common Conversion Factors
Approximate Conversions from Metric to U.S. Customary Measures
Length
| Symbol |
When You Know |
Multiply By |
To Find |
Symbol |
| mm |
millimeters |
0.04 |
inches |
in |
| cm |
centimeters |
0.4 |
inches |
in |
| m |
meters |
3.3 |
feet |
ft |
| m |
meters |
1.1 |
yards |
yd |
| km |
kilometers |
0.6 |
miles |
mi |
Area
| Symbol |
When You Know |
Multiply By |
To Find |
Symbol |
| cm² |
square centimeters |
0.16 |
square inches |
in² |
| m² |
square meters |
1.2 |
square yards |
yd² |
| km² |
sqaure kilometers |
0.4 |
square miles |
mi² |
| ha |
hectares
(10,000 m2) |
2.5 |
acres |
|
Mass (weight)
| Symbol |
When You Know |
Multiply By |
To Find |
Symbol |
| g |
grams |
0.035 |
ounces |
oz |
| kg |
kilograms |
2.2 |
pounds |
lb |
| |
metric ton
(1,000 kg) |
1.1 |
short tons |
|
Volume
| Symbol |
When You Know |
Multiply By |
To Find |
Symbol |
| mL |
milliliters |
0.03 |
fluid ounces |
fl oz |
| mL |
milliliters |
0.06 |
cubic inches |
in³ |
| L |
liters |
2.1 |
pints |
pt |
| L |
liters |
1.06 |
quarts |
qt |
| L |
liters |
0.26 |
gallons |
gal |
| m³ |
cubic meters |
35 |
cubic feet |
ft³ |
| m³ |
cubic meters |
1.3 |
cubic yards |
yd³ |
Temperature (exact)
| Symbol |
When You Know |
Multiply By |
To Find |
Symbol |
| °C |
degrees Celsius |
9/5, add 32 |
degrees Fahrenheit |
°F |
|
K
|
Kelvin
|
subtract 273.15
|
degrees Celsius
|
°C
|
Note: These conversion factors are published as NIST SP 365, which is a laminated metric conversion card. Copies of this publication can be requested by contacting theSI@nist.gov
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