Convert Nanotesla to Gauss (nT to G)

Formula

G = nT ÷ 100000

Derivation from SI units:

• 1 nT = 10⁻⁹ T (also called a gamma in geophysics)
• 1 G = 10⁻⁴ T (exact)
• 1 nT = 1 × 10⁻⁹ T ÷ 0.0001 T per G = 0.00001 G

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

Worked examples

1. A reading of 50 nT converts to 0.0005 G.
   50 nT × 0.00001 = 0.0005 G
2. A value of 1000 nT is 0.01 G.
   1000 nT × 0.00001 = 0.01 G

Where it's used

Nanotesla are used for geomagnetic surveys and magnetometers, while gauss appear in permanent magnet surface fields (for example 3000–5000 G for neodymium). Both measure magnetic flux density (B field), so the conversion is a fixed factor.

Nanotesla 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.