Flux Density Calculator

Calculate magnetic flux density, flux, area, attractive force, core Bmax, or solenoid current from voltage, turns, and permeability.

Choose a tab, enter values, then click Calculate.

Core / Coil Bmax

Flux ÷ Area

Force / Current

AC terms

Voltage, V rms

Frequency

Number of turns, N

Core cross-sectional area, Ac

Optional DC bias

DC calculation method

DC current through winding, Idc

Winding inductance, L

Core AL value

B = Φ / A

Flux density, B

Magnetic flux, Φ

Area, A

Calculation type

Ideal pole-face force, F = B²A / (2µ0)

Flux density, B

Pole face area, A

Attractive force, F

Ideal estimate for a uniform field over the listed area.

Long solenoid, B = µ0µrNI / length

Flux density, B

Current, I

Number of turns, N

Magnetic path or coil length

Relative permeability, µr

Flux Density Formula

The following formula is used to calculate a flux density.

FD = Φ / A

Where FD is the flux density
Φ is the total flux
A is the total area

To calculate flux density, divide the total flux by the total area.

Flux Density Definition

A flux density is defined as the total flux per unit of the area generated from a magnetic field.

Flux Density Example

How to calculate flux density?

First, determine the total flux.
Calculate the total flux generated from the magnetic field.
Next, determine the total area.
Measure the total area the flux is acting on.
Finally, calculate the flux density.
Divide the flux by the area to find the flux density.

FAQ

What is flux density?

Flux density is the total flux per unit area that is being generated by a magnetic field.