Appendix C: Conversion Factor

TABLE C.1: Metric Conversion Factors (U.S. Customary Units to SI Units)

Multlply the U.S. customary unit		To obtain the Sl unit
Name	Symbol	By	Symbol	Name
Acceleration
feet per	ft/s ²	0.3048 ^a	m/s ²	meters per
second squared	second squared
inches per	in/s ²	0.0254 ^a	m/s ²	meters per
second squared	second squared
Area
acre	acre	0.4047	ha	hectare
acre	acre	4.0469 10 ^?3	km ²	square kilometer
square foot	ft ²	9.2903 10 ^?2	m ²	square meter
square inch	in ²	6.4516 ^a	cm ²	square centimeter
square mile	mi ²	2.5900	km ²	square kilometer
square yard	yd ²	0.8361	m ²	square meter
Energy
British thermal unit	Btu	1.0551	kJ	kilojoule
foot-pound (force)	ft lb _f	1.3558	J	joule
horsepower-hour	hp h	2.6845	MJ	megajoule
kilowatt-hour	kW h	3600 ^a	kJ	kilojoule
kilowatt-hour	kW h	3.600 10 ^6a	J	joule
watt-hour	W h	3.600 ^a	kJ	kilojoule
watt-second	W s	1.000 ^a	J	joule

Multiply the U.S. customary unit		To obtain the Sl unit
Name	Symbol	By	Symbol	Name
Force
pound force	lb _f	4.4482	N	newton
Flowrate
cubic feet per second	ft ³/s	2.8317 10 ^?2	m ³/s	cubic meters per second
gallons per day	gal/d	4.3813 10 ^?5	L/s	liters per second
gallons per day	gal/d	3.7854 10 ^?3	m ³/d	cubic meters per day
gallons per minute	gal/min	6.3090...

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