Convert flux density, magnetic field strength and maximum energy product between magnetic units
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Convert between the units commonly used in magnet datasheets, teslameter readings and RFQs. Enter a value and every equivalent will update automatically.
Select the measurement type, enter a value and choose its original unit. The equivalent values update automatically, and any result can be selected to copy it.
Choose flux density, field strength, energy product or field-to-flux conversion in air.
Type the value from your datasheet, instrument reading or technical specification.
The related units appear immediately. Select a result if you want to copy it.
These are some of the conversions most frequently encountered in permanent magnet datasheets and specifications.
| Measurement | Conversion |
|---|---|
| Flux density | 1 T = 1,000 mT |
| Tesla to Gauss | 1 T = 10,000 G |
| Tesla to kilogauss | 1 T = 10 kG |
| Tesla to Weber per square metre | 1 T = 1 Wb/m² |
| Field strength | 1 kOe ≈ 79.577 kA/m |
| Energy product | 1 MGOe ≈ 7.958 kJ/m³ |
| Field to flux in air | 1 Oe corresponds to 1 G |
The relationship between Oersted and Gauss shown above applies only in air or vacuum. It should not be used to calculate flux density inside a magnet, steel component or another magnetic material.
Flux density describes the concentration of magnetic flux through a given area. It is normally expressed in Tesla, millitesla, Gauss or kilogauss.
On a permanent magnet datasheet, remanence—or Br—is a flux-density value. It indicates the residual magnetic flux density after the external magnetising field has been removed.
Magnetic field strength describes the magnetising or demagnetising field. It is commonly expressed in amperes per metre, kiloamperes per metre, Oersted or kilo-Oersted.
Coercivity values such as HcB and HcJ are normally stated using these units and indicate a material’s resistance to demagnetisation.
Maximum energy product represents the maximum magnetic energy that can be stored in a magnet material. It is usually expressed in MGOe or kJ/m³.
Neodymium grade numbers broadly relate to maximum energy product in MGOe, but the grade number should not be treated as an exact performance value. Always check the specified BHmax range on the material datasheet.
If you have a drawing, dimensions, material requirement or target performance, send us your specification. We can advise on suitable magnet materials, grades, coatings, temperature requirements and manufacturability.
Tesla and Gauss are both units of magnetic flux density. One Tesla equals 10,000 Gauss, while one millitesla equals 10 Gauss.
Yes. One Tesla is equivalent to one Weber per square metre.
Multiply the value in kOe by approximately 79.577. For example, 10 kOe is approximately 795.77 kA/m.
Multiply the MGOe value by approximately 7.958. A maximum energy product of 42 MGOe is therefore approximately 334.2 kJ/m³.
Not necessarily. The grade number broadly corresponds to the material’s maximum energy product, but datasheets normally specify an acceptable BHmax range. The grade name also does not define temperature resistance, coercivity or every other performance characteristic.
No. A direct conversion using B = μ₀H is appropriate only for air or vacuum. Inside magnets, steel and other materials, permeability and magnetic behaviour must also be considered.
No. Pull force depends on factors including magnet dimensions, material, air gap and the surrounding magnetic circuit. Use the GUK Magnetic Force Calculator for an initial estimate.
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