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# Simple calculation formulas of coil inductance

Formulas and numerical methods of calculation of inductance coils, which uses Coil32, you can look in the help section of the site, namely:

Here are the simple handbook formulas for the calculation of inductances, which Coil32 does not use, but which can be useful for electronics hobbyists and students.

InductanceFormula
Straight conductor
Parallel conductors (current in one direction)
r≪w
Parallel conductors (current in opposite directions)
r≪w
Microstrip line
Coaxial line
Single-layer coil
(l > 0.8 R)  Wheeler's formula
(online calculator)
Multilayer coil
(l ≈ w)  Wheeler's formula
(online calculator)
Flat coil Wheeler's formula
(online calculator)
Conical coil Wheeler's formula
(online calculator)

LH-inductance of equivalent cylindrical coil
LP-inductance of equivalent flat coil

In all equations all dimensions are in meters, inductance in Henry.

0 #1 Justin 2015-10-20 23:28
I need to calculate the inductance of a few coil designs. I would be using copper tubing instead of wire for cooling purposes. Can I use this calculator and use the cross sectional area of the tubing vs. the wire? I also would like to run using square copper tubing but not sure if the calc accounts for this difference in geometry.
0 #2 Coil32 admin 2015-10-21 06:22
You can use this calculator for copper tubing with round cross sectional area. But it isn't suitable for square tubing.

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