Convert Milligauss to Nanotesla (mG to nT)

Formula

nT = mG × 100

Derivation from SI units:

• 1 mG = 10⁻³ G = 10⁻⁷ T = 0.1 µT
• 1 nT = 10⁻⁹ T (also called a gamma in geophysics)
• 1 mG = 1 × 10⁻⁷ T ÷ 1 × 10⁻⁹ T per nT = 100 nT

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

Worked examples

1. A reading of 2 mG converts to 200 nT.
   2 mG × 100 = 200 nT
2. A value of 10 mG is 1000 nT.
   10 mG × 100 = 1000 nT

Where it's used

Milligauss are used for EMF meters for homes and offices, while nanotesla appear in geomagnetic surveys and magnetometers. Both measure magnetic flux density (B field), so the conversion is a fixed factor.

Milligauss to other magnetic flux density units

Frequently asked questions

Sources

• 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".
• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures .

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