Calculate the inductance of a single-layer helical coil using Wheeler's formula.
Last updated: March 2026 | By ForgeCalc Engineering
A helical coil, or solenoid, is a wire wound into a helical shape. When an electric current passes through it, it creates a magnetic field. Inductance is the property of the coil that opposes changes in current.
Single-layer helical coils are fundamental components in radio frequency (RF) circuits, power supplies, and various electronic sensors. Their inductance depends on the physical dimensions and the number of turns.
Wheeler's formula is accurate to within 1% for coils where the length is greater than 0.8 times the radius (l > 0.8r).
For simple inductance calculations, wire thickness is often ignored, but it affects the 'Q factor' and parasitic capacitance of the coil.
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