Related Resources: Engineering Conversions Equivalent
Electric and Magnetic Quantities Units and Conversions
Engineering Conversions and Equivalents
Electric and Magnetic Quantities Units and Conversions
Where:
Length = L
Mass = M
Time = T
Current = Q/T
Charge = Q
Electric and Magnetic Quantities
Conversion of mksq Units to Gaussian Units
*c = vel. of light (free space) in cm/sec ≈ 3 × 10^{10} Use of table:
1 coulomb = 101 (3 × 10^{10}) statcoulomb = 3 × 10^{9} statcoulomb
QUANTITY

SYMBOL

SI UNIT

SI
EQUATION 
CGS
UNIT 
CGS
EQUATION 
CONVERSION
FACTOR 
Magnetic
induction 
B

tesla (T)

B=µ o (H+M)

gauss (G)

B = H+4πM

1 T = 10 4 G

Magnetic
field strength 
H

ampere/ meter
(A/m) 
H = N×I/lc
( lc  magnetic path, m) 
oersted (Oe)

H = 0.4πN×I/lc
(lc  magnetic path, cm) 
1 A/m =
4π×10 3 Oe 
Magnetic flux

Φ

weber (Wb)

Φ = B×Ac
(Ac  area, m 2 ) 
maxwell (M)

Φ = B×Ac
(Ac area, cm 2 ) 
1 Wb = 10 8 M

Magnetization

M

ampere/ meter (A/m)

M=m/V
(m total magnetic moment, V volume, m 3 ) 
emu/cm 3

M=m/V
(m total magnetic moment, V volume, cm 3 ) 
1 A/m = 10 3
emu / cm 3 
Magnetic
permeability of vacuum 
µ o

newton/ ampere 2

µ o = 4π×10 7

1



4π×10 7

Inductance

L

henry

L=μ o μN 2 Ac/lc
(Ac area, m 2 , lc  magnetic path, m) 
henry

L=0.4πμN 2 Ac/lc×10 8
(Acarea, cm 2 , lc  magnetic path, cm) 
1

Emf (voltage)

V

volt

V=N×dΦ/dt

volt

V=  10 8 N×dΦ/dt

1

Note: in the above equations: N turns, I  current (in amps)
