Technical Guidance Reference: SI Unit Conversion List
■ Basic SI Units ● Quantity as a reference of SI Quantity
● Basic unit provided with unique name and symbol (extracted) Quantity Material Symbol Frequency Hertz Hz Force Newton N Pressure and stress Pascal Pa Energy, work, and heat quantity Joule J Power and efficiency Watt W Voltage Bolt V Electrical resistance Ohm Ω
Material
Symbol
Length
Metre
m
Mass Time
Kilogram Second Ampere
kg
s
Current
A K
Temperature
Kelvin
Quantity of substance Luminous intensity
Mol
mol
Candela
cd
■ SI Prefixes ● Prefix showing integral powers of 10 combined with SI units Coefficient Material Symbol Coefficient Material Symbol Coefficient Material Symbol 10 24 Yotta Y 10 3 Kilo k 10 -9 Nano n 10 21 Zeta Z 10 2 Hecto h 10 -12 Pico p 10 18 Exa E 10 1 Deca da 10 -15 Femto f 10 15 Peta P 10 -1 Deci d 10 -18 Atto a 10 12 Tera T 10 -2 Centi c 10 -21 Zepto z 10 9 Giga G 10 -3 Milli m 10 -24 Yocto y 10 6 Mega M 10 -6 Micro μ
N
■ Principal SI Unit Conversion List (
portions are SI units)
● Force
● Stress
N
kgf
Pa(N/m 2 )
MPa(N/mm 2 )
kgf/mm 2
kgf/cm 2
kgf/m 2
1.01972 × 10 -1
1 × 10 -6
1.01972 × 10 -7 1.01972 × 10 -1
1.01972 × 10 -5 1.01972 × 10
1.01972 × 10 -1 1.01972 × 10 5
1
1
1 × 10 6
9.80665
1
1
9.80665 × 10 6 9.80665 × 10 4
1 × 10 2
1 × 10 6 1 × 10 4
9.80665
1
9.80665 × 10 -2 9.80665 × 10 -6
1 × 10 -2 1 × 10 -6
1
1 × 10 - 4
9.80665
1 1Pa = 1N/m 2 , 1MPa = 1N/mm 2
● Pressure
Pa(N/m 2 )
kPa
MPa
GPa
bar
kgf/cm 2
mmHg or Torr 7.50062 × 10 -3
1 × 10 -3
1 × 10 -6 1 × 10 -3
1 × 10 -9 1 × 10 -6 1 × 10 -3
1 × 10 -5 1 × 10 -2 1 × 10 1 × 10 4
1.01972 × 10 -5 1.01972 × 10 -2 1.01972 × 10 1.01972 × 10 4
1
1 × 10 3 1 × 10 6 1 × 10 9 1 × 10 5
1
7.50062
1 × 10 3 1 × 10 6 1 × 10 2
7.50062 × 10 3 7.50062 × 10 6 7.50062 × 10 2 7.35559 × 10 2
1
1 × 10 3 1 × 10 -1
1
1 × 10 -4
1
1.01972
9.80665 × 10 4 1.33322 × 10 2
9.80665 × 10 1.33322 × 10 -1
9.80665 × 10 -2 1.33322 × 10 -4
9.80665 × 10 -5 1.33322 × 10 -7
9.80665 × 10 -1 1.33322 × 10 -3
1
1.35951 × 10 -3
1 1Pa = 1N/m 2
● Work / Energy / Heat Quantity J kW·h
kgf·m
kcal
2.77778 × 10 -7
1.01972 × 10 -1 3.67098 × 10 5
2.38889 × 10 -4 8.60000 × 10 2 2.34270 × 10 -3
1
3.60000 × 10 6
1
2.72407 × 10 -6 1.16279 × 10 -3
9.80665
1
4.18605 × 10 3
4.26858 × 10 2
1 1J=1W/s,1J=1N/m
● Power (efficiency and motive energy) / Thermal flow W kgf·m/s PS
kcal/h
1.01972 × 10 -1 1.01972 × 10 2
1.35962 × 10 -3
8.60000 × 10 -1 8.60000 × 10 2
1
1 × 10 3
1.35962
1.33333 × 10 -2
9.80665
1
8.43371
7.355 × 10 2
7.5 × 10
6.32529 × 10 2
1
1.18572 × 10 -1
1.58095 × 10 -3
1.16279
1 1W = 1J/s, PS: Horsepower
● Specific Heat
● Thermal Conductivity
● Spindle Speed
1kcal (kg/°C) cal/ (g/°C)
J/(kg·K)
W/(m/K)
kcal/(h·m·°C)
min -1
rpm
2.38889 × 10 -4
8.60000 × 10 -1
1
1 1min -1 =1rpm
1
1
N69
4.18605 × 10 3
1
1.16279
1
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