Main magnetic units conversion is,

 

Magnetic Unit
Magnetic flux density (Br): 1mT // 10Gauss // 0.1
Magnetic flux intensity (Hc): 1kA/m // 4πOe // 0.079577
Magnetic energy product (BHmax): 1kJ/㎥ // 4π×10-2 MGOe // 7.9577

 

Magnetic Unit
Magnetic flux density (Br): 1G // 0.1mT // 10
Magnetic flux intensity (Hc): 1Oe // 1/(4π)kA/m // 12.566
Magnetic energy product (BHmax): 1MGOe // 100/(4π)kJ/㎥ // 0.12566