Office of Planning, Environment, & Realty (HEP)

# Trail Construction and Maintenance Notebook

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## Metric Conversions

To convert from this unit To this unit Multiply by
inch millimeter 25.4*
inch centimeter 2.54*
foot meter 0.3048*
yard meter 0.9144*
mile kilometer 1.6
millimeter inch 0.039
centimeter inch 0.394
centimeter foot 0.0328
meter foot 3.28
meter yard 1.09
kilometer mile 0.62
acre hectare (square hectometer) 0.405
square kilometer square mile 0.386*
hectare (square hectometer) acre 2.47
ounce (avoirdupois) gram 28.35
pound (avoirdupois) kilogram 0.45
ton (2,000 pounds) kilogram 907.18
ton (2,000 pounds) megagram (metric ton) 0.9
gram ounce (avoirdupois) 0.035
kilogram pound (avoirdupois) 2.2
megagram ton (2,000 pounds) 1.102
ounce (U.S. liquid) milliliter 30
cup milliliter 247
cup liter 0.24
gallon liter 3.8
quart liter 0.95
pint liter 0.47
milliliter ounce (U.S. liquid) 0.034
liter gallon 0.264
liter quart 1.057
degrees Fahrenheit degrees Celsius (°F - 32) ÷ 1.8
degrees Celsius degrees Fahrenheit (°C x 1.8) + 32
*The conversion factors with asterisks are exact (the others give approximate conversions).

### Metric Comparisons

• A millimeter, one-thousandth of a meter, is about the thickness of a dime.
• One inch is just 1/64 inch longer than 25 millimeters (1 inch = 25.4 millimeters).
• 150 millimeters is the length of a dollar bill.
• One foot is about 3/16 inch longer than 300 millimeters (12 inches = 304.8 millimeters).
• A meter is a little longer than a yard, about a yard plus the width of this notebook.
• A kilometer is about five-eighths of a mile.

1 kilometer
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1 mile
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Updated: 4/14/2014
HEP Home Planning Environment Real Estate
Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000