April 19, 2024

CONVERSION FACTORS (US AND METRIC)
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The following table of conversion factors includes all the units
used in the maintenance of an engine and for all the practices
described in the Standard Practices Manual. After making the
conversion calculation, the answer should be rounded off to the
nearest decimal unit to the accuracy required by the appropriate
instructions.

LENGTH
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1 mil (mil) = 0.001 in. or (25,4 microns)
1 inch (in.) = 25,4 millimeters (mm)
1 foot (ft) = 0,3048 m or (30,48006 cm)
1 yard (yd) = 0,9144 meter (m)
1 meter (m) = 39.37 inches (1.0936 yards)
1 centimeter (cm) = 0.3937 inch
1 millimeter (mm) = 0.03937 inch
1 micron ( ) = 0,001 mm or 3.937 x 10-5 in.

AREA
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1 square inch (in2) = 645,16 square millimeters (mm2)
(6,4516 square centimeters (cm2)
1 square foot (ft2) = 0.0929 square meter (m2)
1 square meter (m2) = 1.196 square yards (yd2) (10.764 square feet)
1 square centimeter (cm2) = 0.1550 square inch

VOLUME
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1 cubic inch (in3) = 16,387 cubic centimeters (cc)
1 cubic foot (ft3) = 0,028 cubic meter (m3) (28,316 liters)
1 cubic centimeter (cc) = 0.06102 cubic inch
1 cubic meter (m3) = 35.314 cubic feet (1.308 cu yd)
1 fluid ounce (fl oz) = 29,57 cubic centimeters (cm3)
1 quart (qt) = 0,946 liter (946,333 cm3)
1 US gallon (US gal) = 3,785 liters
1 liter (1) = 1.0567 quart (0,001 cubic meter)(0.264 US gallon)

WEIGHT
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1 ounce (oz) = 28,35 grams (g)
1 pound (lb) = 0,4536 kilogram (kg)(453,5924 grams)
1 gram (g) = 0.035 ounce
1 kilogram (kg) = 2.2046 pounds

PRESSURE
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1 pound/square inch (psi) = 6,90 kilopascal (kPa)
1 kilopascal (kPa) = 0.145 pound/square inch (psi)
1 torr = 1 mm Hg
1 bar = 14,5 pound/square inch (psi)

CONCENTRATION
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1 ounce per US gallon = 7,5 grams/liter
1 fluid ounce/us gallon = 7,8 ml/liter
1 pound/US gallon = 0,1190 kg/l, or grams/cc
(119,8 grams/liter)
1 g/l = 0.1335 oz/US gallon
1 ml/l = 0.128 fl oz/US gallon

TORQUE
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1 pound-foot (lb ft) = 12 (lb in.)
1 pound-inch (lb in.) = 0,113 Newton meter (N.m)
1 N.m = 8.85 pound-inch (lb in.)

TEMPERATURE
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Fahrenheit (`F) = 9/5`C + 32
Celsius (`C) = 5/9 (`F – 32)
Kelvin (K) = `C + 273,15
Kelvin (K) = 5/9 (`F + 459.67)
Rankin (`R) = `F + 459.688

SPECIFIC HEAT CAPACITY
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1 Btu/lb = 0,55 cal/g
1 cal/g = 1.8 Btu/lb

DISTANCE
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1 mile (US Statute) = 1,609 kilometers (km)
1 mile (Nautical) = 1,853 kilometers
1 kilometer (km) = 0.621 miles (US Statute)

METRIC RELATIONSHIPS
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1 micrometer ( m) = 0,000001 meter (0.001 millimeter)
1 millimeter (mm) = 0,001 meter
1 centimeter (cm) = 0,01 meter
1 decimeter (dm) = 0,1 meter
1 meter (Metric Standard of length)
1 liter = 0,001 cubic meter
1 gram = weight of 0,001 liter of water
1 bar = 105 Pascal (Pa)
1 Pascal (Pa) = 1 N/m2
1 Newton (N) = 0,102 kilogram (kg)
1 kilogram/square millimeter (kg/mm2) = 9,81 Megapascal (MPa)

MAGNETIC FIELD
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1 Ampere/meter (A/m) = 2,54 x 10-2 Ampere inch (A/in.)

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