Appendix: Conversion Factors

Factors for the conversion of U.S. Customary Units to the International System (SI) of Units

TABLE A.1: **Conversion Factors U.S. Customary to SI**
Multiply the U.S. Customary unit		To obtain the correspond SI unit
Name	Symbol	by	Name	Symbol
acre	ac	4047	square meter	m ²
acre	ac	0.4047	hectare	ha*
British thermal unit	Btu	1.055	kilojoule	kJ
British thermal units per cubic foot	Btu/ft ³	37.259	kilojoules per cubic meter	kJ/m ³
British thermal units per kilowatt-hour	Btu/kWh	1.055	kilojoules per kilowatt-hour	kJ/kWh
British thermal units per pound	Btu/lb	2.326	kilojoules per kilogram	kJ/Kg
British thermal units per ton	Btu/ton	0.00116	kilojoules per kilogram	kJ/Kg
degree Celsius	C	plus 273	Kelvin	K
cubic foot	ft ³	0.0283	cubic meter	m ³
cubic foot	ft ³	28.32	liter	L*
cubic feet per minute	ft ³/min	0.0004719	cubic meters per second	m ³/s
cubic feet per minute	ft ³/min	0.4719	liters per second	L*/s
cubic feet per second	ft ³/s	0.0283	cubic meters per second	m ³/s
cubic yard	yd ³	0.7646	cubic meter	m ³
day	d		86.4kilosecond	ks
degree Fahrenheit	F	0.555 ( F ?32)	degree Celsius	C
foot	ft	0.3048	meter	m
feet per minute	ft/min	0.00508	meters per second	m/s
feet per second	ft/s	0.3048	meters per second	m/s
gallon	gal	0.003785	cubic meter	m ³
gallon	gal	3.785	liter	L*
gallons per minute	gal/min	0.0631	liters per second	L*/s
grain	gr	0.0648	gram	g

horsepower

0.746

kilowatt

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