๐งฒ Magnetic Flux Density Converter
Convert between tesla (T), gauss (G), and related units of magnetic flux density in real time. One tesla is defined as exactly 10,000 gauss.
How to use
- Enter a value in the unit you want to convert from.
- The converted values in the other units update in real time.
How the calculation works
This tool converts between units of magnetic flux density (the strength of a magnetic field). The value you enter is first converted to the SI unit, the tesla (T), then to each of the other units. The tesla is the SI unit; the gauss (G) belongs to the older CGS system. They are related exactly by 1 T = 10,000 G (1 G = 0.1 mT = 100 ยตT). The prefixes mean milli (m) รท 1000, micro (ยต) รท 1 million, and kilo (k) ร 1000. Magnet strength is quoted in both teslas and gauss depending on the country and industry. For example, the surface field of a neodymium magnet is often given as "about 0.3โ0.5 T (3,000โ5,000 G)".
Worked example
1 T = 10,000 G = 1,000 mT 1 G = 0.1 mT = 100 ยตT Typical values Earth's magnetic field (around Japan): about 45โ50 ยตT (about 0.45โ0.5 G) Fridge magnet: about 5 mT (about 50 G) Hospital MRI scanner: 1.5 T or 3 T (15,000โ30,000 G)
Things to be aware of
- Magnetic flux density (B, in T or G) and magnetic field strength (H, in A/m or oersteds) are different quantities. In a vacuum or air, 1 G corresponds to 1 Oe, but inside magnetic materials there is no simple conversion.
- A magnet's surface field varies a lot with where (centre or edge) and how far away it is measured.
- People with pacemakers or other medical devices should keep away from strong magnets.
FAQ
Whatโs the relationship between tesla and gauss?
One tesla (T) is defined as exactly 10,000 gauss (G). Tesla is the SI unit; gauss is the CGS unit.
How strong is Earthโs magnetic field?
Earthโs surface magnetic field varies by location but is roughly 25โ65 microtesla (0.25โ0.65 gauss).
How strong is an MRI machineโs magnetic field?
Typical medical MRI machines use fields of about 1.5โ3 tesla โ tens of thousands of times stronger than Earthโs magnetic field.