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The 7 major SI units and the 22 derived Units

The units that explain everything
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Last updated: February 3, 2026
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First submittedFebruary 3, 2026
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7 Major SI Units
Hint
Abreviation
Answer
It is defined by the distance light travels in a vacuum in 1/299,792,458 of a second.
m
Meter
Measure of mass. Since 2019, its definition is based on the fixed numerical value of the Planck constant.
Kg
Kilogram
Measure of time. It is defined by the vibration frequency of a cesium-133 atom.
s
Second
Measure of electric current. It relates to the flow of elementary charges per second.
A
Ampere
Measure of thermodynamic temperature. It is anchored to the Boltzmann constant.
K
Kelvin
Measure of the amount of substance. One of these contains exactly 6.02214076 × 10²³ elementary entities (Avogadro's number).
mol
Mole
Measure of luminous intensity (perceived brightness) in a specific direction.
Cd
Candela
22 Derived Units
Frequency (cycles per second)
Hz
Hertz
Force
N
Newton
Pressure or Stress
Pa
Pascal
Energy, Work, or Heat
J
Joule
Power or Radiant flux
W
Watt
Electrical Charge
C
Coulomb
Electric potential
V
Volt
Capacitance
F
Farad
Electric resistance
Ω
Ohm
Electric conductance
S
Siemen
Magnetic flux
Wb
Weber
Magnetic flux density
T
Tesla
Inductance
H
Henry
Luminous flux
lm
Lumen
Illuminance
lx
Lux
Radioactivity (decays per second)
Bq
Becquerel
Absorbed dose of radiation
Gy
Gray
Equivalent dose of radiation
Sv
Sievert
Catalytic activity
kat
Katal
Water Tempature
°C
Degree Celsius
Plane angle
rad
Radian
Solid angle
sr
Steradian
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