Convert Millitesla to Milligauss (mT to mG)

Formula

mG = mT × 10000

Derivation from SI units:

• 1 mT = 10⁻³ T
• 1 mG = 10⁻³ G = 10⁻⁷ T = 0.1 µT
• 1 mT = 0.001 T ÷ 1 × 10⁻⁷ T per mG = 10000 mG

Both units are defined exactly, so the factor is exact. Millitesla definition: millitesla; Milligauss definition: milligauss.

Worked examples

1. A reading of 5 mT converts to 50000 mG.
   5 mT × 10000 = 50000 mG
2. A value of 100 mT is 1000000 mG.
   100 mT × 10000 = 1000000 mG

Where it's used

Millitesla are used for fridge and small permanent magnets (about 5–100 mT), while milligauss appear in EMF meters for homes and offices. Both measure magnetic flux density (B field), so the conversion is a fixed factor.

Millitesla to other magnetic flux density units

Frequently asked questions

Sources

• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures .
• Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "gauss".

Last reviewed: 2026-10-15. Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.