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Online calculators

Tesla flat spiral coil:

This calculator uses J.C.Maxwell's coaxial circular filaments approximation, as well as multilayer inductor calculator.

on-line Tesla flat spiral coil calculator
Tesla flat pancake spiral coil calculator
Select units:   AWG →   SWG → 

L – Required inductance
Di   – Coil Inner Diameter
d   – Wire Diameter  
s   – Gap between turns

N – Number of turns
Do   – Coil Outer Diameter
Lth   – Length of wire
Clear all


This calculator also can be suitable for the calculation of spider coil. Tesla flat spiral coil calculator


There is the handbook formula for calculating flat coil  (Harold A. Wheeler):

L (uH) = r^2 * N^2 / (8 * r + 11 * w)

  • L = Inductance µH
  • r = average winding radius in inches
  • w = width of winding (in inches)
  • N = number of turns

 This formula is used in the calculators linking below.

Another calculators:

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