Magnetic Dipole Moment of a Coil

Calculate the magnetic moment of a current loop or coil and its on-axis field at a distance, free online.

Number of turns

Current (A)

Coil radius (cm)

Distance along the axis (cm)

About this calculator

A coil of N turns, current I and loop area A has dipole moment m = N·I·A (A·m²). Far on its axis (distance z ≫ radius) the field is B = μ₀·m ÷ (2π z³).