Toroidal Inductor Number of Turns Calculator

Calculate Toroidal Inductor Turns

Enter the desired inductance in microhenries (µH).
This is a dimensionless value specific to the core material (e.g., ferrite, powdered iron).
Enter the area of the core's cross-section in square millimeters (mm²).
Enter the average length of the magnetic path within the core in millimeters (mm).

Efficiently determine the precise number of turns required for your toroidal inductor. This calculator simplifies complex inductance calculations, helping engineers and hobbyists design optimal circuits for power supplies, filters, and RF applications. Save time and ensure accuracy in your electrical projects.

Formula:

N = √((L × l) / (μ0 × μr × A))

Where:

  • N = Number of Turns (dimensionless)
  • L = Target Inductance (Henries)
  • l = Mean Magnetic Path Length of Toroid (meters)
  • μ0 = Permeability of Free Space (approximately 4π × 10-7 H/m)
  • μr = Relative Permeability of Core Material (dimensionless)
  • A = Cross-sectional Area of Toroid Core (square meters)

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