SI
(1)
METRIC INFORMATION
BASE UNITS
DESCRIPTION UNIT SYMBOL
length
meter
m
mass
kilogram kg
force
newton
N
liquid liter L
temperature
Celsius °C
pressure
kilopascal kPa
torque newton-meter
N•m
land velocity kilometer per hour km/h
navigation velocity knot kn
PREFIXES
PREFIX SYMBOL MEANING VA LU E
kilo k one thousand 1000
centi
c
one hundredth of 0.01
milli
m
one thousandth of 0.001
micro
µ
one millionth of 0.000 001
CONVERSION FACTORS
TO CONVERT TO
(2)
MULTIPLY BY
in
mm
25.4
in
cm
2.54
in² cm² 6.45
in³ cm³ 16.39
ft
m
0.3
oz g
28.35
lb kg 0.45
lbf N
4.4
lbf•in N•m 0.11
lbf•ft N•m 1.36
lbf•ft lbf•in 12
PSI
kPa 6.89
imp. oz U.S. oz 0.96
imp. oz mL 28.41
imp. gal U.S. gal 1.2
imp. gal L 4.55
U.S. oz
mL 29.57
U.S. gal
L 3.79
U.S. quart L 0.95
knot MPH
1.15
MPH km/h 1.61
Fahrenheit
Celsius
(°F - 32) ÷ 1.8
Celsius
Fahrenheit
(°Cx1.8)+32
hp kW
.75
(1)
The international system of units abbreviates SI in all languages.
(2) To obtain the reverse sequence, divide by the given factor. Example: to convert millimeters
to inches, divide by 25.4.
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