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Useful Conversion Factors
The
following
factors
are provided to 10
digits
of
accuracy where possible
.
Exact
values
are marked with an asteri
sk
.
For
more
complete
information
on conversion factors
,
refer to
Metric Practice
Guide
£380-74
by
the
American
Society
for
Testing
and
Materi
als
(ASTM
).
Length
1 inch
25.4
millimeters'
1 fool
0.304 8 meter'
1 mile
(statute}t
1.609 344 kilometers'
1 mile fnautica')t
1.852 kilometers'
1 mile nautical)t
1.150 779
448 miles
(slalule)t
Area
1
square inch
6.451 6
square
centimeters'
1
square
foot
0.092 903 04
square meter"
1
acre
43 560
square
feet
1
square
milet
640
acres
Volume
1
cubic inch
16.387 064 cubic centimeters"
1 cubic
foot
0.028316847
cubic meter
1
ounce
fflUid)t
29.57352956cubiccentimeters
1
ounce
fluid)t
0.029 573 530
liler
1
gallon
(fluid)t
3.785 411 784
liters·
Mass
1
ounce (mass)
28.349 523 12
~rams
1
pound
(mass)
0 .453 592 37
ki
ogram'
1
10n
(short)
0 .907 184
74
metric ton"
Energy
1 British thermal unit
1
055.055
853
Joules
1 kilocalorie
(mean)
4
190.02
Joules
1 watt·hour
3
600 Joules'
Force
1
ounce
~force~
0.27801385
Newton
1 pound force
4.448
221
615
Newtons
Power
1 horsepower (electric)
=
746
watts·
Pressure
1 atmosphere
760 mm Hg at
sea
level
1
atmosphere
14.7 pounds per
square
inch
1 atmosphere
101 325 Pascals
Temperature
Fahrenheit
1.8 Celsius
+
32
Celsius
5/9
(Fahrenheil
-
32)
Kelvin
Celsius
+
273.
15
Kelvin
5/9
(Fahrenheil
+
459.67)
Kelvin
5/9
Rankine
t
U.S.
values shown.
*
Exact values.
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