About Neodymium Magnets

1 inch is 25.4 mm. Use our chart to convert fractional magnet sizes to decimals and millimeters, and see how each shape is measured.

Standard plated magnets shouldn't touch food. Use magnets sealed in stainless steel or behind a solid barrier of wood, plastic or epoxy.

Keep magnets at least 6 inches from pacemakers and ICDs, and 12 inches for large magnets. See how far each magnet size's field reaches.

Magnetic pull fades very quickly with distance. Bigger magnets reach farther: double the size and you roughly double the reach.

N52 pulls about 25% harder than N42 at the same size. Pick N52 when space is tight and N42 when a slightly thicker magnet fits.