Convert Millitesla to Gauss (mT to G)

Formula

G = mT × 10

Derivation from SI units:

• 1 mT = 10⁻³ T
• 1 G = 10⁻⁴ T (exact)
• 1 mT = 0.001 T ÷ 0.0001 T per G = 10 G

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

Worked examples

1. A 50 mT fridge magnet surface field is 500 G.
   50 mT × 10 = 500 G
2. The Earth’s field, 0.05 mT, is 0.5 G.
   0.05 mT × 10 = 0.5 G

Where it's used

Hall-probe and teslameter readings in millitesla are converted to gauss for magnet datasheets and older test reports. Multiply by 10.

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.