Engineering Statics/Appendices/Conversion Factors

U.S. Customary Units to SI Units 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