# Engineering Statics/Appendices/Conversion Factors

## U.S. Customary Units to SI Units

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