Magnetic moment converter
Convert magnetic moment between SI units and the Bohr and nuclear magnetons that atomic physics counts in.
That's about the same as an electron. That is about 1 Bohr magnetons.
What it means
How magnetic is that?
The Bohr magneton is the natural size for an electron’s magnetism; the nuclear magneton, 1,836 times smaller, is the scale for nuclei.
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Three things worth knowing
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1 µB = 9.274 × 10⁻²⁴ J/T
That is the moment of a single electron’s spin, to within a tenth of a percent. Iron atoms in a magnet carry about 2.2 of them each.
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A current loop by another name
J/T and A·m² are the same unit, because a magnetic moment is either "energy gained per tesla" or "current times area". The two definitions meet exactly.
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Moment is not field
A moment (J/T) belongs to the magnet; a field (tesla) is what it produces somewhere else. The field falls off with distance cubed; the moment never changes.
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Background
About magnetic moment
A magnetic moment says how strongly something responds to a magnetic field and how strongly it makes one. The SI unit is J/T, which is exactly the same as A·m²: a current going round a loop.
Atoms are measured in Bohr magnetons, nuclei in nuclear magnetons, and the factor between them is the mass ratio of the proton to the electron.