Convert Gauss to Nanotesla (G to nT)

Formula

nT = G × 100000

Derivation from SI units:

• 1 G = 10⁻⁴ T (exact)
• 1 nT = 10⁻⁹ T (also called a gamma in geophysics)
• 1 G = 0.0001 T ÷ 1 × 10⁻⁹ T per nT = 100000 nT

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

Worked examples

1. A reading of 50 G converts to 5000000 nT.
   50 G × 100000 = 5000000 nT
2. A value of 5000 G is 500000000 nT.
   5000 G × 100000 = 500000000 nT

Where it's used

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

Gauss 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.