This page calculates expected pull forces based on extensive computer simulation and product testing. We don't know of an easy formula we can share to calculate these results.
All dimensions and distances must be in decimal format. Fractional inches will not calculate correctly.
This calculator only considers discs, cylinders and rings that are magnetized along the cylindrical axis. While K&J Magnetics offers diametrically magnetized discs, 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: firstname.lastname@example.org.