Magnetic field converter
Convert magnetic flux density (the B field) between tesla and gauss.
1 Gauss = 0.0001 Tesla
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About these units
Magnetic flux density, often just called the magnetic field, is measured in tesla in the SI and in gauss in the older CGS system: one tesla is exactly 10 000 gauss. Earth's field is about 25 to 65 microtesla; a fridge magnet is around 5 millitesla; MRI scanners use 1.5 to 3 tesla.
EMF meters often read in milligauss. Magnetic field strength (amperes per metre, oersted) is a related but different quantity and is not mixed in here.
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Questions people ask
How many gauss is one tesla?
Exactly 10 000 gauss.
How many microtesla is 1 milligauss?
Exactly 0.1 µT. So 1 µT = 10 mG.
How strong is Earth's magnetic field?
About 25 to 65 µT at the surface (0.25 to 0.65 gauss), weakest near the equator.
Factors checked 19 October 2026.