Single-Layer Air-Core Coil Calculator
Approximate inductance (L) of a single-layer coil. Approximation is close for coils
whose length is equal to or greater than 0.4 times diameter at frequencies
below about 30 MHz. Note also that coils with length greater than about 5 times
diameter are often physically impractical (and a waste of wire). Turns must be
evenly spaced.
L(µH) = (d2n2)/(18d + 40λ)
Where n is number of turns,
d is the diameter of the coil in inches and
λ is the length of the coil in inches
(inches = cm x .3937).
back
close
more calculators
maxmcarter.com