Magnetic Field Converter
Enter a magnetic flux density in any common unit and see it in all the others instantly: tesla (T), millitesla (mT), microtesla (µT), nanotesla (nT, the gamma used in geophysics), kilogauss (kG), gauss (G) and milligauss (mG). The value is converted to tesla internally, and since the gauss is exactly 1e-4 T the CGS conversions are exact too. Handy for MRI and magnet specs (tesla and kilogauss), Earth's magnetic field and compass work (microtesla and gauss), magnetometer and geophysical survey data (nanotesla/gamma) and EMF measurements (milligauss). Everything is computed locally in your browser.
T (tesla)
1
mT
1,000
µT
1,000,000
nT (γ)
1,000,000,000
kG
10
G (gauss)
10,000
mG
10,000,000
How to use
- Type a magnetic flux density value.
- Pick the unit you entered it in.
- Read the value in every other unit and copy whichever you need.
Frequently asked questions
- How do I convert tesla to gauss?
- Multiply by 10,000, because one gauss is exactly 1e-4 tesla. So a 1.5 T MRI scanner is 15,000 G (15 kG), and a 0.5 T magnet is 5,000 G. Going the other way, divide gauss by 10,000.
- How strong are everyday magnetic fields?
- Roughly: Earth's field 25–65 µT (0.25–0.65 G), a fridge magnet about 5 mT (50 G), a strong neodymium magnet at its surface 0.5–1.4 T, and a clinical MRI 1.5–3 T. Household EMF readings are usually quoted in milligauss, where 1 µT = 10 mG.
- What is a gamma (γ)?
- In geophysics and magnetometry the gamma is a unit of flux density equal to one nanotesla, which is 1e-5 gauss. It is shown on the nT row here rather than as a separate line, since the two are the same value. Survey maps of crustal anomalies are usually drawn in nT.
- Is magnetic flux density the same as magnetic field strength?
- Not quite. This tool converts flux density B, measured in tesla or gauss. Field strength H is a different quantity measured in amperes per metre (or oersted in CGS), and relating the two needs the permeability of the material. In air they are often used loosely as if interchangeable, but the units are not.
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