One-layer inductance coil calculator

If you need to make home-brew inductance coil for the matching circuit, for an amplifier, for magic crystal radio etc, you have some question:

• how many turns are in the coil?
• what is the diameter and length of the winding?
• which wire to use?

You have to choose the winding design empirically, guided by the following general tips. Most of online calculators enable to find inductance of the coil knowing its winding dimensions and number of turns.  This calculator help for you to estimate the number of turns of your home-brew one-layer R.F. inductor or choke on the design stage. The calculator uses Bob Weaver's equation with round wire corrections. The Coil32 for Android and the cross-platform Coil64 makes it possible to calculate the self-capacitance and Q-factor of the single-layer coil.

Calculate number of turns

ENTER THE INPUT DATA:

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Select units:

mm/cmmil/inch

AWG → 000000000012345678910111213141516171819202122232425262728293031323334353637383940

SWG → 7/06/05/04/03/02/001234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950

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L	= mHμHnH	– Required inductance
D		– Diameter of coil-former
d		– Diameter of wire without insulation
k		– Diameter of wire with insulation	Automatic

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Calculate

RESULT:

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N	=	– number of turns
l		– Length of winding

Clear all

 Coil64 also estimates Q-factor and self-capacity of the single-layer RF coil.

Below you can see the references to best online calculators by my opinion, that enable to find inductance of the ready-made inductor.

References:

1. Single-layer Coil Inductance calculator by IN3OTD
2. RF Inductance Calculator by ON4AA
3. Round Coil Inductance Calculator by R.Weaver