K&J Magnetics mascot, Joe Magneato

All orders placed & paid online by 1PM ET

(M-F) will be shipped the same day!


Magnet Gap Calculator

Calculate the magnetic field between 2 magnets

Select Configuration:
Two Disc Magnets
Two Disc Magnets with Yoke
Two Disc Magnets with Yoke & Iron Cones


This Gap Calculator estimates the magnetic field strength between two neodymium magnets separated by a small gap.

The magnets are positioned with opposite poles facing one another, so that the magnets are attracting towards one another.

For an in-depth explanation of how this calculator works, check out our Gap Calculator article.

All data is provided in gauss.

All data presented in this calculator is derived from a series of finite element analysis studies for a pair of equal sized disc/cylinder magnets in free space.  While we have verified the accuracy of results with our own experimental measurements, be sure to verify with your own measurements in your particular application.  Nearby magnets or ferromagnetic materials can alter your results.

All dimensions and positions must be in decimal format. Fractional inches will not calculate correctly.

This calculator only considers discs and cylinders that are magnetized along the cylindrical axis. While K&J Magnetics offers diametrically magnetized magnets, this calculator does not apply to them.

This calculator is currently a beta version and is intended only for reference. K&J Magnetics, Inc. will not be held liable for its use. All calculations are approximations and should not be used as the sole source of design data. The factors of your application may change these values considerably. Be sure to test magnets in your configuration.

Please report any troubles, concerns or suggestions about this calculator to: contactus@kjmagnetics.com.