Engineering Statics/Appendices/Conversion Factors

U.S. Customary Units to SI Units

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