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Toroidal Choke & Inductor Designer

Estimate winding turns and choking impedance for common toroidal cores. Presets use nominal AL values.

Core / Mix

Custom AL (nH/turn²)

Target Inductance (µH)

Nominal AL: nH/turn²

Exact Turns:

Rounded Turns:

Actual Inductance:

HF Choking Impedance

Impedance is estimated from the rounded turn count using Z = 2πfL. Real-world chokes vary with winding style, spacing, and self-resonance.