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# Approximate Conversions from Metric to U.S. Customary Measures

## Share

The numerical value of the units in the When You Know column are multiplied by the approximate unit conversion factor found in the Multiply By column to obtain a numerical value for the units listed in the To Find Column. For example:

When You Know Multiply By To Find
20 m 1.09 approximately 21.8 yd

### Length

Symbol When You Know Multiply By To Find Symbol
mm millimeter 0.04 inch in
cm centimeter 0.39 inch in
m meter 3.28 foot ft
m meter 1.09 yard yd
km kilometer 0.62 mile mi

### Area

Symbol When You Know Multiply By To Find Symbol
cm² square centimeters 0.16 square inch in²
square meter 1.20 square yard yd²
km² square kilometer 0.39 square mile mi²
ha hectare
(10,000 m2)
2.47 acre

### Mass (weight)

Symbol When You Know Multiply By To Find Symbol
g gram 0.04 ounce oz
kg kilogram 2.20 pound lb
metric ton
(1,000 kg)
1.10 short ton

### Volume

Symbol When You Know Multiply By To Find Symbol
mL milliliter 0.03 fluid ounce fl oz
mL milliliter 0.06 cubic inch in³
L liter 2.11 pint, liquid pt
L liter 1.06 quart, liquid qt
L liter 0.26 gallon gal
cubic meter 35.31 cubic foot ft³
cubic meter 1.31 cubic yard yd³

### Temperature (exact)

Symbol When You Know Calculation To Find Symbol
°C degree Celsius multiply 1.8, then add 32 degree Fahrenheit °F
K Kelvin subtract 273.15 degree Celsius °C

U.S. Customary to Metric Conversions

Note: These approximate 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 [at] nist.gov

## Contacts

• Metric Program
Created January 13, 2010, Updated January 26, 2021