UNITS CONVERSION TABLES - International Society of Automation
International Society of Automation
UNITS CONVERSION TABLES
Overview
These conversion tables are provided for your reference.
Units Conversion Tables
Table 1
Multiples and Submultiples of SI Units
Table 2
Length Units
Table 3
Area Units
Table 4
Volume Units
Table 5
Mass Units
Table 6
Density Units
Table 7
Volumetric Liquid Flow Units
Table 8
Volumetric Gas Flow Units
Table 9
Mass Flow Units
Table 10
High Pressure Units
Table 11
Low Pressure Units
Table 12
Speed Units
Table 13
Torque Units
Table 14
Dynamic Viscosity Units
Table 15
Kinematic Viscosity Units
Table 16
Temperature Conversion Formulas
International Society of Automation
International Society of Automation
Table 1: Multiples and Submultiples of SI units
Prefix Symbol
Multiplying Factor
exa peta tera giga mega kilo hecto*
E
1018 1 000 000 000 000 000 000
P
1015
1 000 000 000 000 000
T
1012
G
109
1 000 000 000 000 1 000 000 000
M
106
1 000 000
k
103
1 000
h
102
100
deca*
da 10
deci*
d
10-1
centi
c
10-2
milli
m
10-3
micro
u
10-6
nano
n
10-9
pico
p
10-12
femto
f
10-15
atto
a
10-18
* these prefixes are not normally used
10 0.1 0.01 0.001 0.000 001 0.000 000 001 0.000 000 000 001 0.000 000 000 000 001 0.000 000 000 000 000 001
Table 2: Length Units
Millimeters Centimeters
mm
cm
1
0.1
10
1
1000 1000000
25.4
100 100000
2.54
304.8 914.4 1609344
30.48 91.44 160934.4
Meters Kilometers
m
km
0.001 0.01
0.000001 0.00001
1 1000 0.0254
0.001 1
0.000025
0.3048 0.000305 0.9144 0.000914 1609.344 1.609344
Inches
in
0.03937 0.393701 39.37008 39370.08
1 12 36 63360
Feet
ft
0.003281 0.032808 3.28084 3280.84 0.083333
1 3 5280
Yards
yd
0.001094 0.010936 1.093613 1093.613 0.027778 0.333333
1 1760
Miles
mi
6.21e-07 0.000006 0.000621 0.621371 0.000016 0.000189 0.000568
1
Table 3: Area Units
Millimeter
Centimeter
square
square
mm2
cm2
1 100 1000000 645.16 92903 836127
0.01 1
10000 6.4516 929.0304 8361.274
Meter square
m2
0.000001 0.0001 1
0.000645 0.092903 0.836127
Inch square
in2
0.00155 0.155
1550.003 1
144 1296
Foot square
ft2
0.000011 0.001076 10.76391 0.006944
1 9
Yard square
yd2
0.000001 0.00012 1.19599 0.000772 0.111111
1
International Society of Automation
International Society of Automation
Table 4: Volume Units
Centimeter Meter
cube
cube
cm3
m3
1 1000000
1000 16.4 28317 3785 4545 158970
0.000001 1
0.001 0.000016 0.028317 0.003785 0.004545 0.15897
Liter
ltr
0.001 1000
1 0.016387 28.31685
3.79 4.55 159
Inch cube in3
0.061024 61024 61 1 1728 231 277 9701
Foot cube
ft3
0.000035 35
0.035 0.000579
1 0.13 0.16
6
US gallons US gal
0.000264 264
0.264201 0.004329 7.481333
1 1.20 42
Imperial gallons
Imp. gal
0.00022 220 0.22
0.003605 6.229712 0.832701
1 35
US barrel (oil)
US brl
0.000006 6.29
0.00629 0.000103 0.178127 0.02381 0.028593
1
Table 5: Mass Units
Grams
g
1 1000 1000000 907200 1016000 453.6 28
Kilograms
kg
0.001 1
1000 907.2 1016 0.4536 0.02835
Metric tonnes
tonne
0.000001 0.001 1 0.9072 1.016
0.000454 0.000028
Short ton
shton
0.000001 0.001102 1.102293
1 1.119929
0.0005 0.000031
Long ton
Lton
9.84e-07 0.000984 0.984252 0.892913
1 0.000446 0.000028
Pounds
lb
0.002205 2.204586 2204.586
2000 2239.859
1 0.0625
Ounces
oz
0.035273 35.27337 35273.37
32000 35837.74
16 1
Table 6: Density Units Gram/milliliter Kilogram/meter cube
g/ml
kg/m3
1 0.001 0.01602 27.68
1000 1
16.02 27680
Pound/foot cube lb/ft3
62.42197 0.062422
1 1727.84
Pound/inch cube lb/in3
0.036127 0.000036 0.000579
1
Table 7: Volumetric Liquid Flow Units
Liter/second
Liter/minute
Meter cube/hour
Foot cube/minute
L/sec
L/min
M3/hr
ft3/min
Foot cube/hour
ft3/hr
US gallons/minute
gal/min
1 0.016666 0.277778
0.4719 0.007867 0.06309 0.00184
60 1 16.6667 28.31513 0.472015 3.785551 0.110404
3.6 0.06
1 1.69884 0.02832 0.227124 0.006624
2.119093 0.035317 0.588637
1 0.01667 0.133694 0.003899
127.1197 2.118577 35.31102
60 1 8.019983 0.2339
15.85037 0.264162 4.40288 7.479791 0.124689
1 0.029165
US barrels (oil)/day
US brl/d
543.4783 9.057609 150.9661 256.4674 4.275326 34.28804
1
International Society of Automation
International Society of Automation
Table 8: Volumetric Gas Flow Units
Normal meter cube/hour Standard cubic feet/hour
Nm3/hr
scfh
1 0.02832
1.699
35.31073 1
59.99294
Standard cubic feet/minute
scfm
0.588582 0.016669
1
Table 9: Mass Flow Units
Kilogram/hour
Pound/hour
kg/h
lb/hour
1
2.204586
0.4536 3600 1000
1 7936.508 2204.586
Kilogram/second
kg/s
0.000278 0.000126
1 0.277778
Ton/hour
t/h
0.001 0.000454
3.6 1
Table 10: High Pressure Units
Bar
Pound/square inch
Kilopascal
Megapascal
bar
1 0.06895
0.01 10 0.9807 0.001333 1.013
psi
14.50326 1
0.1450 145.03 14.22335 0.019337 14.69181
kPa
100 6.895
1 1000 98.07 0.13333 101.3
MPa
0.1 0.006895
0.001 1
0.09807 0.000133
0.1013
Kilogram force/
centimeter square kgf/cm2
1.01968
0.070307
0.01020
10.197
1 0.00136 1.032936
Millimeter of mercury
Atmospheres
mm Hg
750.0188 51.71379
7.5002 7500.2 735.5434
1 759.769
atm
0.987167 0.068065
0.00987 9.8717 0.968115 0.001316
1
Table 11: Low Pressure Units
Meter of water mH2O
1
0.304813 0.135937 0.345299 0.025403 0.000102
Foot of water ftH2O
3.280696
1 0.445969 1.13282 0.083339 0.000335
Centimeter of mercury cmHg
7.356339
2.242311 1
2.540135 0.186872 0.00075
Inches of mercury
inHg
2.896043
0.882753 0.39368
1 0.073568 0.000295
Inches of water inH2O
39.36572
11.9992 5.351265 13.59293
1 0.004014
Pascal
Pa 9806 2989 1333 3386 249.1
1
International Society of Automation
International Society of Automation
Table 12: Speed Units Meter/second Meter/minute Kilometer/hour Foot/second Foot/minute Miles/hour
m/s
m/min
km/h
ft/s
ft/min
mi/h
1
59.988
3.599712
3.28084
196.8504 2.237136
0.01667
1
0.060007
0.054692
3.281496 0.037293
0.2778
16.66467
1
0.911417
54.68504 0.621477
0.3048
18.28434
1.097192
1
60
0.681879
0.00508
0.304739
0.018287
0.016667
1
0.011365
0.447
26.81464
1.609071
1.466535
87.99213
1
Table 13: Torque Units
Newton meter
Kilogram force meter
Nm
kgfm
1
0.101972
9.80665 1.35582 0.112985
1 0.138255 0.011521
Foot pound
ftlb
0.737561 7.233003
1 0.083333
Inch pound
inlb
8.850732 86.79603
12 1
Table 14: Dynamic Viscosity Units
Centipoise*
Poise
cp
1 100 1488.16
poise
0.01 1
14.8816
Pound/foot?second
lb/(ft?s)
0.000672 0.067197
1
Table 15: Kinematic Viscosity Units
Centistoke*
Stoke
Foot square/second
cs
St
ft2/s
1
0.01
0.000011
100
1
0.001076
92903
929.03
1
1000000
10000
10.76392
*note: centistokes x specific gravity = centipoise
meter square/second
m2/s
0.000001 0.0001
0.092903 1
Table 16: Temperature Conversion Formulas
Degree Celsius (?C)
(?F - 32) x 5/9
(K - 273.15)
Degree Fahrenheit (?F)
(?C x 9/5) + 32
(1.8 x K) - 459.67
Kelvin (K)
(?C + 273.15)
(?F + 459.67) ? 1.8
November 2007
International Society of Automation
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