Design and analyze inductors with our free online inductor calculators. Whether you are calculating coil inductance from physical dimensions, determining the number of turns needed for a specific henry value, or sizing a choke for a switching power supply, these tools deliver precise results instantly. Enter your core material, wire gauge, bobbin dimensions, and desired inductance to receive turns count, wire length, and DC resistance estimates. Each calculator includes air-core, toroidal, and ferrite core options with permeability data, saturation limits, and temperature coefficient adjustments for real-world accuracy. Power supply designers, RF engineers, and audio enthusiasts use these tools to optimize filter performance, minimize core losses, and prevent saturation in buck and boost converters. From simple air-core RF coils to high-current power inductors, our calculators cover every inductor design need. No signup required—access from any device and wind the perfect coil with confidence.

Inductor Calculators: Free Coil, Choke & Filter Design Tools