Unit Conversion of Common Magnet Properties
This article is written by New Favor Industry Co., Ltd.
New Favor specializes in the manufacturing and application solutions of high-performance rare earth magnets such as Neodymium Iron Boron (NdFeB), dedicated to providing stable and reliable magnetic component support to clients worldwide.
Whether you are in the electronics, energy, or automation industries, our expertise ensures efficient and precise magnetic solutions tailored to your needs.
Magnets are widely used in fields such as electronics, electric motors, wind power generation, and automobiles. When selecting materials and comparing performance, it is essential to correctly understand the units and conversion methods of magnetic properties. Since magnetic materials can be represented using both the International System of Units (SI) and the Gaussian system (CGS), New Favor Industry Co., Ltd. recommend that engineers and procurement personnel understand how the two systems correspond to each other to ensure seamless integration of design and supply chain.
The four main performance indicators commonly used for magnets are remanence (Br), magnetic flux, magnetic coercivity, and maximum energy product. Below is a unit conversion table to facilitate quick and accurate understanding of key data.
Magnetic Properties & Unit Conversion Chart
| Magnetic Property Name | Symbol | SI Unit | Conversion Factor | CGS Unit |
| 剩磁 Remanence | Br | mT（毫特斯拉） | 1 mT = 10 G | G（高斯） |
| 磁通量 Magnetic Flux |
ΦB | Wb（韋伯） | 1 Wb = 10⁸ Mx | Mx（麥克斯韋） |
| 矯頑力/內禀矯頑力 Magnetic Coercivity |
bHc / iHc | kA/m（千安培/米） | 1 kOe = 79.58 kA/m | kOe（千奧斯特） |
| 最大磁能積 Maximum Energy Product |
(BH)max | kJ/m³（千焦耳/立方米） | 1 MGOe ≈ 7.96 kJ/m³ | MGOe（百萬高斯奧斯特） |
Key Terminology and Application Explanations:
1.Remanence (Br, remanence)
Remanence (Br) indicates the magnetic flux density retained by a magnet after the external magnetic field is removed. A higher value means stronger residual magnetism, closely related to the degree of magnetic saturation. The unit is T (tesla, SI system, usually expressed as mT) or G (gauss, CGS system, usually expressed as kG). This is an important indicator for judging the strength and magnetic stability of magnet materials, especially critical in permanent magnet motors and sensors.
2.Magnetic Flux (ΦB, Magnetic Flux)
This represents the total amount of magnetic field passing through a certain area, which is the result of integrating the magnetic field over an area. It is commonly used in electromagnetics and transformer design. The unit is Mx (maxwell, CGS system) or Wb (weber, SI system).
3.Magnetic Coercivity (bHc / iHc, Magnetic Coercivity)
Magnetic Coercivity (bHc / iHc, Magnetic Coercivity)
Magnetic coercivity refers to the intensity of the reverse magnetic field required to eliminate the magnetism of a magnet. bHc is the apparent coercivity, while iHc is the intrinsic coercivity.
bHc corresponds to the field strength needed to reduce the magnetic flux density to zero, while iHc is the reverse field necessary to bring the internal magnetization to zero. The two differ in various application scenarios.
It is commonly used to evaluate a magnet's resistance to demagnetization and is particularly critical for material selection in high-temperature or high-frequency applications.
4.Maximum Energy Product ((BH)max, Maximum Energy Product)
This indicator measures the maximum energy density a magnet can release under working conditions and is a key reference for selecting magnet grades. Common units are MGOe or kJ/m³. High-performance magnets such as NdFeB often highlight their strength with this value.
Why is it necessary to understand both unit systems?
In the global magnet supply chain, Europe, America, and some traditional industries still prefer the CGS (gauss) system, while the global standard trend and Asian manufacturing chains generally use the SI (International System of Units). Understanding unit conversion helps prevent design mistakes and inconsistencies in product performance caused by data misinterpretation.
Accurately mastering the unit conversion of magnetic properties is not only the foundation of engineering design but also an important bridge for global magnet trade and technical exchange. New Favor Industry Co., Ltd. specializes in NdFeB magnets and high-performance permanent magnets. If you have further technical needs or application questions regarding magnetic materials, please contact us for professional support.
