Solenoid Inductance Calculator
Free calculate self-inductance of a solenoid coil. determine inductance using l = μ₀n²a/l for air-core solenoids.
Input Parameters
1 for air-core, higher for ferromagnetic cores
Results
Enter parameters to calculate inductance
Solenoid Inductance Formula
Formula
L = μ₀μᵣN²A / l
Where:
- • L = inductance (H)
- • μ₀ = 4π×10⁻⁷ H/m
- • μᵣ = relative permeability
- • N = number of turns
- • A = cross-sectional area (m²)
- • l = length (m)
Notes
- • Assumes uniform field
- • Valid for long solenoids (l >> r)
- • μᵣ = 1 for air-core
- • Higher μᵣ increases inductance