Helmholtz Coil Calculator

Calculate the magnetic field at the center of a Helmholtz coil pair, or determine the current needed to cancel an ambient field.

Input
Field at Center
B
0.0001499T
B
0.1499mT
B
149.86μT
B
1.4986G
Abridged Optics — Helmholtz Coil Calculator v1.0B = (4/5)^(3/2) × μ₀NI/R. Valid at the midpoint between two coils separated by distance R.

All information, equations, and calculations have been compiled and verified to the best of our ability. For mission-critical applications, we recommend independent verification of all values. If you find an error, please let us know.