Engineering Statics/Appendices/Conversion Factors

U.S. Customary Units to SI UnitsEdit

To convert from To Multiply by
ft/sec^2 m/s^2  
in/sec^2 m/s^2  
ft^2 m^2  
in^2 m^2  
lbm/in^3 kg/m^3  
lbm/ft^3 kg/m^3  
kip (1000 lb) N  
lb N  
ft m  
in m  
mi (U.S. statute) m  
mi (international nautical) m  
lbm kg  
slug (lb-sec^2/ft) kg  
ton (2000 lbm) kg  
lb-ft N-m  
lb-in N-m  
in^4 m^4  
lb-ft-sec^2 kg-m^2  
lb-sec kg-m/s  
lb-ft-sec kg-m^2/s  
ft-lb/min W  
hp (550 ft-lb/sec) W  
atm (14.7 lb/in^2) N/m^2 or Pa  
lb/ft^2 N/m^2 or Pa  
lb/in^2 or psi N/m^2 or Pa  
lb/in N/m  
ft/sec m/s  
knot (nautical mi/hr) m/s  
mi/hr m/s  
mi/hr km/h  
ft^3 m^3  
in^3 m^3  
BTU J  
ft-lb J  
kw-h J  
* Exact value