Magnetic Flux Density Converter

About the magnetic flux density converter

Magnetic flux density (B), often loosely called “magnetic field,” is the flux per unit area and determines the force on moving charges and currents. The SI unit is the tesla (T); CGS uses the gauss (G), with 1 T = 10,000 G. Earth’s field is about 25–65 μT (0.25–0.65 G), a fridge magnet is around 5 mT, MRI machines run at 1.5–7 T, and the strongest research magnets exceed 45 T.

Frequently asked questions

• How many gauss are in a tesla? +

  Exactly 10,000. So 1 mT = 10 G and 1 μT = 0.01 G.

• What is the strength of Earth’s magnetic field? +

  It varies with latitude but is typically 25–65 μT (0.25–0.65 G).

• What is the gamma in geophysics? +

  A magnetics-survey unit equal to 1 nT (10⁻⁹ T or 10⁻⁵ G).