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CGS Unit System

The CGS system is based on the fundamental units of length, mass, and time, using centimetre (cm), gram (g), and second (s).
In electromagnetism, CGS includes the ESU, EMU, and Gaussian subsystems, where derived units (such as statcoulomb, abampere, gauss, and oersted) are defined with different constants. This page focuses on the three fundamental CGS units and their SI equivalents as a reference.
CGS Unit Quantity SI Equivalent
centimetre (cm) length 0.01 metre (m)
gram (g) mass 0.001 kilogram (kg)
barye (Ba) pressure 0.1 pascal (Pa)
biot (Bi) (= abampere, abA) electric current 10 amperes (A)
calorie (cal) heat / energy 4.184 joules (J)
darcy permeability 9.869233×10−13 square metres (m2)
debye (D) electric dipole moment 3.33564×10−30 coulomb·metre (C·m)
dyne (dyn) force 10−5 newton (N)
emu magnetic dipole moment 10−3 A·m2
erg work, energy 10−7 joule (J)
franklin (Fr) (= statcoulomb) electric charge 3.33564×10−10 coulomb (C)
gal (Gal) acceleration 0.01 m·s−2
gauss (G) magnetic flux density 10−4 tesla (T)
gilbert (Gi) magnetomotive force 0.7957747 ampere-turn (At)
kayser (K) wavenumber 100 m−1
lambert (Lb) luminance ≈ 3183.0989 cd·m−2
langley surface heat flux 41.84 kJ·m−2
line magnetic flux 10−8 weber (Wb) (= maxwell)
maxwell (Mx) magnetic flux 10−8 weber (Wb)
oersted (Oe) magnetic field strength 79.5774715 A·m−1
phot (ph) illuminance 104 lux (lx)