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 TB 55-1900-201-45/1
Table D-4
English and Metric Conversion Factors
The metric system is used by scientists and engineers because of the ease with which calculations may be made and
compared and because it is the World-wide system of measurements (except in the U.S.). This table provide the factors
for converting English units to metric units and vise versa.
English to Metric
Metric to English
Length
1 inch
=- 25.40 millimeters ()
1 millimeter
= 0.0394 inches
1 inch
= 2.540 centimeters (cm)
1 centimeter
=- 0.3937 inches
1 foot
= 0.305 meters (m)
1 meter
= 3.281 feet
1 yard
= 0.914 meters
1 meter
= 1.094 yards
1 statute mile
= 1.161 kilometers
1 kilometer
= 0.621 statute miles
1 nautical mile
= 1.853 kilometers
1 kilometer
=0.5396 nautical miles
Area
1 sq inch
=64.5 sq milliters ( )
1 sq millimeter
= 0.0155 sq inches
= 6.45 seq centimeters (cm2)
1 sq inch
1 eq centimeter
= 0.155 sq inches
1 sq yard
= 0.836 sq meters (M2)
1 sq meter
= 10.76 sq feet
1 acre
= 0.405 hectares
21 q meter
= 1.196 aq yards
= 2.59 eq kilometers (km2)
1 sq mile
1 hectare
=2.47 acres
1 sq kilometer
=0.386 sq miles
Volume and Capacity
1 cu inch
= 163.9 cu millimeters (m3)
1 cu millimeter
=.0061 cu inches
1 cu inch
= 16.39 cu centimeters (cm3)
1 cu centimeter
= 0.0610 cu inches
I cu foot
= 0.0283 cu meters (m3)
1 cu meter
= 35.3 cu feet
1 cu yard
= 0.765 cu meters
1 cu meter
= 1.308 cu yards
1 US liq ounce
= 29.57 milliliters (ml)
1 millimeter
=0.0338 US liq ounces
1 US liq pint
= 0.473 milliliters
1 Liter
= 2.113 US liq pint
1 US liq quart
= 0.946 milliliters
1 Liter
= 1.057 US liq quarts
3
1 US liq gallon
= 3.785 Liters
1 Liter
= 0.2642 US liq gallons
Weight (Mass)4
1 grain
= 0.0648 grams
1 gram
=15.43 grains
1 ounce
= 28.35 grams
1 gram
= 0.0353 ounces
1 pound
=0.4536 kilograms
1 kilogram
= 2.205 pounds
1 long ton
= 1.016 metric ton
1 metric ton
= 0.94 long ton
1 short ton
= 0.907 metric tons
1 metric ton
= 1.102 short tons
(A metric ton - 1,000 kg)
Linear Velocity
= 3.281 x 103 mm /sec
1 ft/sec
1 _/sec
= 304.8 ft/sec
=3.281 x 102 cm/sec1
1 ft/sec
1 ca/sec
=30.48 ft/sec
1 ft/sec
= 3.281 */sec
1 /s c
=0.3048 ft/sec
1 ft/min
=3.281 n/min
1 m/min
= 0.3048 ft/ln
1 mi/hr
=37.28 km/min
1 km/mn
=-2.682 x 10- mi/hr
1 mi/hr
=0.6214 km/hr
1 k/hr
= 1.609 mi/hr
1 knot
= 0.5396 km/hr
1 km/hr
= 3.088 x 10-2 knots
D-5
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