What Is the Gauss Rating for a Strong Magnet?


The gauss is a measure of the strength of magnetic fields, relating force, length and electric current. It is used to conveniently measure weak fields, such as a small permanent magnets. Because it's a small unit, strong magnets will result in large measurements in gauss.


  • The gauss is a unit of magnetic field strength named after mathematician Carl F. Gauss. It's useful for dealing with relatively weak magnetic forces. The Earth's magnetic field measures a few gauss.

Magnet Strength

  • The stronger the magnet, the denser its magnetic field. Its field produces forces in other magnets and in metals.

Permanent Magnets

  • Currently, the strongest permanent magnets are those made with rare-earth metals such as neodymium. Their magnetic strength can be more than 14,000 gauss. This figure can also be stated as 14 Kilogauss (KGs).


  • Magnets used in Magnetic Resonance Imaging (MRI) machines are electromagnets that are supercooled with liquid helium. They are the strongest magnets in regular use, running 20,000 to 70,000 gauss.


  • Special magnets are used in scientific research to test the limits of magnet construction techniques and materials. The strongest experimental magnets run about 45 tesla, or 450,000 gauss.

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