SI Metric Conversions

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Metric conversions

SI* (MODERN METRIC) CONVERSION FACTORS
APPROXIMATE CONVERSIONS TO SI UNITS					APPROXIMATE CONVERSIONS FROM SI UNITS

Symbol	When You Know	Multiply By	To Find	Symbol	Symbol	When You Know	Multiply By	To Find	Symbol

LENGTH					LENGTH
in	inches	25.4	millimeters	mm	mm	millimeters	0.039	inches	in
ft	feet	0.305	meters	m	m	meters	3.28	feet	ft
yd	yards	0.914	meters	m	m	meters	1.09	yards	yd
mi	miles	1.61	kilometers	km	km	kilometers	0.621	miles	mi
AREA					AREA
in²	square inches	645.2	square millimeters	mm²	mm²	square millimeters	0.0016	square inches	in²
ft²	square feet	0.093	square meters	m²	m²	square meters	10.764	square feet	ft²
yd²	square yards	0.836	square meters	m²	m²	square meters	1.195	square yards	ac
ac	acres	0.405	hectares	ha	ha	hectares	2.47	acres	mi²
mi²	square miles	2.59	square kilometers	km²	km²	square kilometers	0.386	square miles
VOLUME					VOLUME
fl oz	fluid ounces	29.57	milliliters	ml	ml	milliliters	0.034	fluid ounces	fl oz
gal	gallons	3.785	liters	l	l	liters	0.264	gallons	gal
ft³	cubic feet	0.028	cubic meters	m³	m³	cubic meters	35.71	cubic feet	ft³
yd³	cubic yards	0.765	cubic meters	m³	m³	cubic meters	1.307	cubic yard	yd³
NOTE: Volumes greater than 1000 l shall be shown in m³
MASS					MASS
oz	ounces	28.35	grams	g	g	grams	0.035	ounces	oz
lb	pounds	0.454	kilograms	kg	kg	kilograms	2.202	pounds	lb
T	short tons (2000 lb)	0.907	megagrams	Mg	Mg	megagrams	1.103	short tons (2000 lb)	T
TEMPERATURE (exact)					TEMPERATURE (exact)
°F	Fahrenheit temperature	5(F-32)/9 or (F-32)/1.8	Celcius temperature	°C	°C	Celcius temperature	1.8C +32	Fahrenheit temperature	°F
ILLUMINATION					ILLUMINATION
fc	foot-candles	10.76	lux	l	lx	lux	0.0929	foot-candles	fc
fl	foot-Lamberts	3.426	candela/m²	cd/m²	cd/m²	candela/m²	0.2919	foot-Lamberts	fl
FORCE and PRESSURE or STRESS					FORCE and PRESSURE or STRESS
lbg	poundforce	4.45	newtons	N	N	newtons	0.225	poundforce	lbf
psi	poundforce per square inch	6.89	kilopascals	kPa	kPa	kilopascals	0.145	poundforce per square inch	psi

(Revised August 1992)

*SI is the symbol for the International System of Units. Approximate rounding should be made to comply with Section 4 of ASTM E380.

The use of SI units is encouraged with Part VI. Future editions of Part VI will use only SI units. The conversions will be based primarily on AASHTO guides. Specific conversion of standards will be subjected to the FEDERAL REGISTER rulemaking process.

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