The Solenoid Inductance Calculator estimates the self-inductance of a tightly wound solenoid using the long-coil approximation L = μ₀μr·N²·A / l.
How to Use Solenoid Inductance Calculator
- Enter the number of turns N — full winding count.
- Enter the coil length l — the axial length of the winding (not the wire length).
- Enter the radius r or diameter d — pick whichever is easier to measure.
- Enter μr — 1 for air, much higher for ferrite or iron cores.
- Read L — automatically scaled to nH, μH, mH or H.
Formula & Theory — Solenoid Inductance Calculator
A = π · r²
L = μ₀ · μr · N² · A / l
μ₀ = 4π × 10⁻⁷ H/mUse Cases for Solenoid Inductance Calculator
- Filter & matching networks — pick inductor count for a desired L.
- Power electronics — size choke and transformer primaries.
- Sensors — design search coils and inductive proximity sensors.
- Education — explore how geometry, turns and core material shape inductance.