Bohr magneton with Units

The Bohr Magneton is 9.274009994 x 10^-24 J·T^-1

In atomic physics, the Bohr magneton (symbol μ_B), (also known as the Bohr-Procopiu magneton or electronic Bohr magneton. ) is a physical constant and the natural unit for expressing an electron magnetic dipole moment.Bohr magneton is used to indicate the magnetic moment of the electron structure in an atom, equal to 9.27 × 10 ⁻²⁴  erg/gauss.

The Bohr magneton is classified under The Electron and atomic physics constants and  is defined in SI units by:

 μ_B =e·h/2m_e

and in Gaussian CGS Units By:

μB =(e·h)/2m_e c

where:

• e is the elementary charge,
• h is the reduced Planck constant
• m_e is the electron rest mass 
• c is the speed of light

The magnitude of an electron's spin magnetic moment is approximately one Bohr magneton.

Reference: 

• Wikipedia: en.wikipedia.org/wiki/Bohr_magneton