Milligauss (mG) and microtesla (µT)
The two units for power-frequency magnetic fields: 1 µT = 10 mG, so 0.4 µT = 4 mG.
measurement
Last verified 12 August 2026.
- Category
- measurement
Definition
Milligauss belongs to the CGS system and is standard in North American consumer practice; microtesla is the SI unit and is used in European guidelines and scientific literature. The conversion is exact: 1 µT equals 10 mG. Most confusion in ELF discussion is a factor-of-ten unit error, including the frequently misquoted 0.3–0.4 µT epidemiological threshold, which is 3–4 mG.
Sources
- nist-si The International System of Units (SI), NIST Special Publication 330 — National Institute of Standards and Technology. government, link checked 2026-08-12.
- who-elf Electromagnetic fields and public health: exposure to extremely low frequency fields — World Health Organization, 2007. government, link checked 2026-08-12.
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