Page 14 - Handbook of Civil Engineering Calculations, Second Edition

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TABLE 1. Commonly Used USCS and SI Units*

SI Conversion factor—multiply USCS unit by
USCS unit SI unit symbol this factor to obtain the SI unit
square feet square meters m 2 0.0929

cubic feet cubic meters m 3 0.2831
pounds per square inch kilopascal kPa 6.894
pound force newton N 4.448
foot pound torque newton-meter Nm 1.356

kip-feet kilo-newton kNm 1.355
gallons per minute liters per second L/s 0.06309
kips per square inch megapascal MPa 6.89
inch millimeter mm 25.4
feet millimeter mm 304.8

meter m 0.3048
square inch square millimeter mm 2 0.0006452
cubic inch cubic millimeter mm 3 0.00001638

inch 4 millimeter 4 mm 4 0.000000416
pound per cubic foot kilogram per cubic kg/m 3 16.0
meter
pound per foot kilogram per meter kg/m 1.49
pound per foot force Newton per meter N/m 14.59

pound per inch force Newton per meter N/m 175.1
pound per foot density kilogram per meter kg/m 1.488
pound per inch density kilogram per meter kg/m 17.86
pound per square inch load kilogram per square kg/m 2 703.0
concentration meter
pound per square foot load kilogram per square kg/m 2 4.88
concentration meter
pound per square foot Pascal Pa 47.88
pressure

inch-pound torque Newton-meter N-m 0.1129
chain meter m 20.117
fathom meter m 1.8288
3
cubic foot per second cubic meter per m /s 0.02831
second
4
foot (area moment of meter 4 m 4 0.0086309
inertia)
mile meter m 0.0000254
(continued)