Engineering Statics/Appendices/Conversion Factors

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U.S. Customary Units to SI Units[edit]

To convert from To Multiply by
ft/sec^2 m/s^2 3.048 \times 10^{-1*}
in/sec^2 m/s^2 2.54 \times 10^{-2*}
ft^2 m^2 9.2903 \times 10^{-2}
in^2 m^2 6.4516 \times 10^{-4*}
lbm/in^3 kg/m^3 2.7680 \times 10^{4}
lbm/ft^3 kg/m^3 1.6018 \times 10
kip (1000 lb) N 4.4482 \times 10^{3}
lb N 4.4482
ft m 3.048 \times 10^{-1*}
in m 2.54 \times 10^{-2*}
mi (U.S. statute) m 1.6093 \times 10^{3}
mi (international nautical) m 1.852 \times 10^{3*}
lbm kg 4.5359 \times 10^{-1}
slug (lb-sec^2/ft) kg 1.4594 \times 10
ton (2000 lbm) kg 9.0718 \times 10^{2}
lb-ft N-m 1.3558
lb-in N-m 0.11298
in^4 m^4 41.623 \times 10^{-8}
lb-ft-sec^2 kg-m^2 1.3558
lb-sec kg-m/s 4.4482
lb-ft-sec kg-m^2/s 1.3558
ft-lb/min W 2.2597 \times 10^{-2}
hp (550 ft-lb/sec) W 7.4570 \times 10^{2}
atm (14.7 lb/in^2) N/m^2 or Pa 1.0133 \times 10^{5}
lb/ft^2 N/m^2 or Pa 4.7880 \times 10
lb/in^2 or psi N/m^2 or Pa 6.8948 \times 10^{3}
lb/in N/m 1.7513 \times 10^{2}
ft/sec m/s 3.048 \times 10^{-1*}
knot (nautical mi/hr) m/s 5.1444 \times 10^{-1}
mi/hr m/s 4.4704 \times 10^{-1*}
mi/hr km/h 1.6093
ft^3 m^3 2.8317 \times 10^{-2}
in^3 m^3 1.6387 \times 10^{-5}
BTU J 1.0551 \times 10^{3}
ft-lb J 1.3558
kw-h J 3.60 \times 10^{6*}
* Exact value