Conversion Factors

For readers who wish to convert measurements from the metric system of units to the inch-pound system, the conversion factors are listed below.

Multiply By To obtain
millimeter 0.039 inch
centimeter 0.394 inch
meter 3.281 foot
kilometer 0.621 mile
square kilometer 0.386 square mile
liter 0.264 gallon
cubic meter 1.308 cubic yard

A simple rule of thumb for approximate conversions: 1 inch equals about 25 millimeters, or about 2.5 centimeters; 1 yard equals about 1 meter; 1 quart equals about 1 liter.

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Maintained by J.M. Watson updated 9.11.97