Magnetic Flux Density Converter — Tesla, Gauss, mT
Convert between 6 units of magnetic flux density — tesla (T), millitesla (mT), microtesla (μT), nanotesla (nT), gauss (G), and milligauss (mG). Earth's surface field is 25–65 μT; fridge magnets are ~5 mT; clinical MRI machines use 1.5–3 T; the strongest continuous lab field is 45.5 T. 1 tesla = 10,000 gauss. Used in MRI, electric motors, particle accelerators and data storage.
About the Magnetic Flux Density Converter
Magnetic flux density (also called the B-field) measures the strength of a magnetic field at a point in space, indicating how much force it exerts on moving charges. The SI unit is the tesla (T). Earth's magnetic field is about 25–65 microteslas; fridge magnets are around 5 milliteslas; MRI machines use 1.5–7 tesla; and the strongest continuous magnetic fields produced in labs exceed 45 tesla. The older CGS unit, the gauss (G), is 10⁻⁴ tesla.
- ›Earth's surface magnetic field ranges from 25 μT (near equator) to 65 μT (near poles)
- ›Clinical MRI machines operate at 1.5 T or 3 T; research machines reach 10.5 T for humans
- ›A neodymium permanent magnet produces about 1–1.4 T at its surface
- ›The strongest continuous magnetic field ever produced was 45.5 T (NHMFL, Tallahassee, 2019)