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Common Conversion Factors

Approximate Conversions from Metric to U.S. Customary Measures


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 Multiply By To Find Symbol
°C degree Celsius 1.8, add 32 degree Fahrenheit °F

K

Kelvin

subtract 273.15

degree Celsius

°C


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@nist.gov

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