Solenoid Magnetic Field Calculator

Calculate the magnetic field strength (B) inside a solenoid.

Input Parameters

Current (I) (A)

Total Turns (N)

Solenoid Length (l) (m)

Relative Permeability (μr)

Calculation Results

Enter parameters to calculate

About this calculator

Quick Reference

BMagnetic Flux Density

ICurrent through wire

NTotal number of turns

lLength of the solenoid

Overview

A solenoid is a coil of wire that creates a uniform magnetic field in its interior when an electric current passes through it.

💡

Pro Tips

The magnetic field inside a long solenoid is almost uniform.
Field strength increases with more turns, higher current, or a magnetic core.
The formula B = μ0 * μr * (N / l) * I assumes the length is much greater than the diameter.
μ0 (vacuum permeability) ≈ 1.2566 x 10^-6 T·m/A.

Fun Facts

Formula: B = μ0 * μr * (N / l) * I