Conversion Table from SI (International Units) System
Comparison of SI, CGS, and Engineering Units
Unit System
SI
Prefixes Used in SI System
Units
Length
Mass
Time
Temperature Acceleration
Multiples
Force
Stress
Pressure
Energy
m kgs K, °Cm/s N Pa Pa
2
CGS System
cm
Engineering
Unit System
m
g
s
°C
kgf · s2/ms
Gal
Power
J W
dyndyn/cm2dyn/cm2erg erg/s
°Cm/s2
kgfkgf/m2kgf/m2
kgf · m
kgf · m/s
Prefix
Symbols
Multiples
Prefix
Symbols
1018
1015
1012
Exa
Peta
Tera
E
P
T
10—1
10—2
10—3
Deci
Centi
Milli
d
c
m
109
106
103
Giga
Mega
Kilo
G
M
k
10—6
10—9
10—12
Micro
Nano
Pico
µ
n
p
102
10
Hecto
Deca
h
da
10—15
10—18
Femto
Ato
f
a
Conversion Factors from SI Units
Conversion Factors from SI Units (Continued)
Names of Units
Symbols Names of Units
Symbols
Conversion
Factors
from SI Units
Angle
Radian
rad
Degree
Minute
Second
°
´
˝
180/π
10 800/π
648 000/π
Length
Meter
m
Micron
Angstrom
µ
Å
106
1010
Area
Square meter
m2
Are
Hectare
a
ha
10—2
10—4
Volume
Cubic meter
m3
Liter
Deciliter
l, L
dl, dL
103
104
Time
Second
s
Minute
Hour
Day
min
h
d
1/60
1/3 600
1/86 400
Frequency
Hertz
Hz
Cycle
s—1
1
Speed of Rotation
Revolution per second
s—1
Revolution per miunte
min–1
60
Speed
Meter per second
m/s
Kilometer per hour
Knot
km/h
kn
3 600/1 000
3 600/1 852
Parameter
SI Units
Units other than SI
2
2
Acceleration
Meter per second per second
m/s
Gal
g
Gal
G
10
1/9.806 65
Mass
Kilogram
kg
Ton
t
10—3
Force
Newton
N
Kilogram-force
Ton-force
Dyne
kgf
tf
dyn
1/9.806 65
1/ (9.806 65×103)
105
Torque or Moment
Newton · meter
N·m
Kilogram-force meter
kgf · m
1/9.806 65
Stress
Pascal
Pa
(N/m2)
Kilogram-force per square centimeter
Kilogram-force per square millimeter
kgf/cm2
kgf/mm2
1/ (9.806 65×104)
1/ (9.806 65×106)
Pressure
Pascal
(Newton per square meter)
Pa
(N/m2)
Kilogram-force per square centimeter
Water Column
Mercury Column
Torr
Bar
Atmosphere
kgf/cm2
mH2O
mmHg
Torr
bar
atm
1/9.806 65
1/(9.806 65×103)
760/(1.013 25×105)
760/(1.013 25×105)
10—5
1/(1.013 25×105)
Names of Units
Symbols Names of Units
Units
Conversion
Factors
from SI Units
Energy
Joule
(Newton · meter)
J
(N · m)
Erg
Calorie (International)
Kilogram-force meter
Kilowatt hour
French horse power hour
erg
calIT
kgf · m
kW · h
PS · h
107
1/4.186 8
1/9.806 65
1/(3.6×106)
≈ 3.776 72×10—7
Work
Watt
( Joule per second)
W
( J/s)
Kilogram-force meter per second
Kilocalorie per hour
French horse power
kgf · m/s
kcal/h
PS
1/9.806 65
1/1.163
≈ 1/735.498 8
Viscosity,
Viscosity Index
Pascal second
Pa · s
Poise
P
10
Kinematic Viscosity, Square meter per second
Kinematic Viscosity Index
m2/s
Stokes
Centistokes
St
cSt
104
106
Temperature
K, °C
Degree
°C
[See note (1)]
Electric Current,
Ampere
Magnetomotive Force
A
Ampere
A
1
Voltage,
Volt
Electromotive Force
V
(Watts per ampere)
(W/A)
1
Parameter
SI Units
Kelvin, Degree celsius
Units other than SI
Magnetic Field
Strength
Ampere per meter
A/m
Oersted
Oe
4π/103
Magnetic Flux
Density
Tesla
T
Gauss
Gamma
Gs
γ
104
109
Electrical Resistance
Ohm
Ω
(Volts per ampere)
(V/A)
1
Note:
(1) The conversion from TK into θ °C is θ = T—273.15 but for a temperature difference, it is ∆T = ∆θ.
However, ∆T and ∆θ represent temperature differences measured using the Kelvin and Celsius scales respectively.
Remarks:
The names and symbols in ( ) are equivalent to those directly above them or on their left.
Example of conversion 1N=1/9.806 65kgf