Convert Maxwells to Milliwebers (Mx to mWb)

Formula

mWb = Mx ÷ 100000

Derivation from SI units:

• 1 Mx = 1 G·cm² = 10⁻⁸ Wb (exact)
• 1 mWb = 10⁻³ Wb
• 1 Mx = 1 × 10⁻⁸ Wb ÷ 0.001 Wb per mWb = 0.00001 mWb

Both units are defined exactly, so the factor is exact. Maxwell definition: maxwell; Milliweber definition: milliweber.

Worked examples

1. A reading of 1000 Mx converts to 0.01 mWb.
   1000 Mx × 0.00001 = 0.01 mWb
2. A value of 50000 Mx is 0.5 mWb.
   50000 Mx × 0.00001 = 0.5 mWb

Where it's used

Maxwells are used for older transformer and magnet design formulas, while milliwebers appear in transformer core flux per turn. Both measure magnetic flux, so the conversion is a fixed factor.

Maxwell to other magnetic flux 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, "maxwell".
• 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.