Free tool
Surface Field & Pull Force Calculator
Enter a magnet's shape, size and grade to estimate its surface gauss and pull force range. No sign-up required.
Shape
Surface field
456–470 mT
≈ 4,561–4,702 Gs
Centre of the pole face · at 20 °C
Pull force
16.3–26.1 N
≈ 1.67–2.66 kg
Pull-off force perpendicular to flat mild steel (upper end = best case) · at 20 °C
Sliding hold on a vertical steel surface is only ~20–30 % of this.
Theoretical estimates for preliminary selection only. Temperature is applied as a reversible Br change; the grade's max working temperature (80 °C) is a catalogue value and must be checked against the magnet's working point (thin magnets demagnetise at lower temperatures). Pull assumes clean, flat mild steel of the thickness entered; plate saturation is a simplified estimate.
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