Electronics
Inductance Calculator
Size coil inductance by entering the number of turns, core material, coil area, and length. Great for filters and RF experiments.
inductancecoilhenry
Solenoid Inductance
Estimate inductance from turns, coil radius, length, and core material.
Inductance
4.264e-2 H
Millihenry
42.637 mH
Microhenry
42636.691 µH
Solenoid inductance
L = μ₀ μᵣ N² A / l
μ₀ is vacuum permeability (4π × 10⁻⁷ H/m). μᵣ is the relative permeability of the core. A is cross-sectional area (m²) and l is coil length (m).
How to use
- Enter the number of turns and coil dimensions.
- Pick a core material to set the relative permeability or type a custom value.
- Review inductance in henries with millihenry and microhenry conversions.
Example
Input: Turns = 120, Radius = 1.5 cm, Length = 6 cm, Core = Ferrite (μᵣ ≈ 200)
Output: Inductance ≈ 1.35 mH
FAQ & notes
Does wire thickness matter?
Wire diameter only impacts resistance. Inductance depends on turns, area, length, and core permeability.
Can I use this for toroidal cores?
The formula targets solenoid coils. Modify inputs or use toroid-specific equations for best accuracy.