HOLDING FORCE
CALCULATOR.
Pick a Blumags magnet with confidence. Combine our measured pull-force data with your job parameters — plate thickness, air gap, load angle and friction — to estimate real-world holding force and safety factor.
The numbers that decide whether your magnet holds.
PLATE THICKNESS
Thinner steel saturates faster, dropping pull force. We factor in plate thickness so the prediction matches reality, not the spec sheet.
AIR GAP
Paint, rust, marine growth and uneven surfaces leave a gap between magnet and steel. Even a fraction of a millimeter reduces grip dramatically.
LOAD ANGLE & FRICTION
Pulling perpendicular is best-case. Shear loads rely on friction — typically 20–30% of the rated force, depending on the surface.
Magnet Calculator
Enter your job parameters and we'll email you the predicted holding force and safety factor for every Blumags magnet.
Applied load
The maximum load that will be applied on the magnet.
Load angle
0° = lateral, 90° = perpendicular.
Air gap
The distance between magnet and steel surface (paint, marine growth, rust).
Plate thickness
Thinner steel may lead to saturation.
Friction coefficient
Friction helps at angles below 90°.
Send results to
Enter your contact details to receive the calculation by email.
Calculations are based on Blumags measurement data for Flipper, Willy and Moby.
Need the math today?
Send us your plate thickness, load, angle and environment — we'll size the magnet for you.