Table of SI units

2020.4.1

Table-A. SI base units

SI prefixes
Non-SI units
accepted for use with the SIua (astronomical unit)t (tonne), Da (dalton),u (unified atomic mass unit)
min (minute), h (hour), d (day)SI units

Namelengthm (metre)mass

kg (kilogram)

timeelectric
thermodynamic temperature
amount of substanceluminous intensitys (second)
A (ampere)
K (kelvin)mol (mole)
cd (candela)

Table-B. Examples of coherent derived units in the SI expressed in terms of base units
Name

Non-SI units
accepted for use with the SI
ha (hectare)l, L (litre)

SI units
2

Non-SI units
accepted in Japanese MeasurementÅ⇒nm（The unit of nm is recommended in the paper）

Non-SI units
accepted in Japanese Measurement

aream (metre)volumem3 (cubic metre)
speed, velocitym/s (metre per second)
acceleration
m/s2 (metre per second squared)
wavenumber
m-1 (reciprocal metre)density, mass density
kg/m3 (kilogram per cubic metre)surface density
kg/m2 (kilogram per square metre)
specific volume
m3/kg (cubic metre per kilogram)current density
A/m2 (ampere per square metre)magnetic field strength
A/m (ampere per metre)amount concentration, concentration
mass fraction%、volume fractionl%, *1)
mol/m3 (mole per cubic metre)mass concentration
mass fraction%、 mass%, *1)
kg/m3 (kilogram per cubic metre)
luminance
cd/m2 (candela per square metre)refractive index
1 (one)relative permeability
1 (one)*1) %(parts per hundred), ‰(parts per thouzand), ppm(parts per million), ppb(parts per billion), ppt(parts per trillion), ppq(parts per quadrollion)

Table-C. Coherent derived units in the SI with special names and special names and symbols
Nameplane angle
solid angle
frequency
force
pressure, stressenergy, work, amount of heat
power, radiant flux
electric charge, amount of electricity
electric potential difference,electromotive force
capacitanceelectric resistanceelectric conductancemagnetic flux
magnetic flux density
inductance
Celsius temperatureluminous flux
illuminanceactivity referred to a radionuclide
absorbed dose, specific energy (imparted),kerma
dose equivalent, ambient dose equivalent,
directional dose equivalent,
personal dose equivalentcatalytic activity

Expressed in terms of
Non-SI units
other SI units
accepted for use with the SIo1(degree), ' (minute), " (second)1

SI unitsrad (radian)sr (steradian)
Hz (hertz)
N (newton)
Pa (pascal)
J (joule)
W (watt)
C (coulomb)

rpm(revolution per minute),
N/m
Nm
J/s

2

V (volt)

W/A

F (farad)Ω (ohm)S (siemens)
Wb (weber)T (tesla)
H (henry)oC (degree Celsius)lm (lumen)lx (lux)
Bq (becquerel)

C/V
V/A
A/VVs
Wb/m2
Wb/A

atm(atmosphere）, Torr(torr)eV (electronvolt)
var(var), VA(volt ampere)

cd sr
lm/m2

Gy (gray)

J/kg

Sv (sievert)

J/kg

kat (katal)

Table-D. Examples of SI coherent derived units whose names
and symbols include SI coherent derived units with special names and symbols
NameSI units

dynamic viscosity
moment of force
surface tension
angular velocity
angular acceleration
heat flux density, irradianceheat capacity, entropy
specific heat capacity, specific entropy
specific energy
thermal conductivity
energy density
electric field strength
electric charge density
surface charge density
electric flux density, electric displacement
permittivity
permeability
molar energy
molar entropy, molar heat capacity
exposure (x- and γ-rays)
absorbed dose rate
radiant intensity
radiance
catalytic activity concentration

Pa s (pascal second)N m (newton metre)N/m (newton per metre)rad/s (radian per second)rad/s2 (radian per second squared)
W/m2 (watt per square metre)
J/K (joule per kelvin)
J/(kg K) (joule per kilogram kelvin)
J/kg (joule per kilogram)
W/(m K) (watt per metre kelvin)
J/m3 (joule per cubic metre)
V/m (volt per metre)
C/m3 (coulomb per cubic metre)
C/m2 (coulomb per square metre)
C/m2 (coulomb per square metre)F/m (farad per metre)H/m (henry per metre)
J/mol (joule per mole J/mol)
J/(mol K) (joule per mole kelvin)
C/kg (coulomb per kilogram)
Gy/s (gray per second)
W/sr (watt per steradian)W/(m2 sr) (watt per square metre steradian)
kat/m3 (katal per cubic metre)

Table-E. Others
Name

Non-SI units
accepted in Japanese Measurement

SI units

kinematic viscosity
logarithmic ratio quantities
potential Hydrogen
For detail, refer to "SI brochure -8th Edition-" at the BIPM website (www.bipm.org).

Non-SI units
accepted for use with the SI

Non-SI units
accepted in Japanese Measurement
P(poise)Non-SI units
accepted for use with the SI

Non-SI units
accepted in Japanese Measurement
St(stokes）
dB(decibel）
pH(ph)

Factor Name Symbol
1024
1021
1018
1015
1012
109
106
103
102
10
1
10-1
10-2
10-3
10-6
10-9
10-12
10-15
10-18
10-21
10-24

yotta
zetta
exa
peta
teragiga
megakilo
hecto
decaZYEPTGM
khda

deci
centi
milli
micro
nano
pico
femto
atto
zepto
yocto

dcm
μnpfazy