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About Magnetic Flux Conversion
Magnetic flux measures the total magnetic field passing through a surface—the "amount" of magnetic field lines penetrating an area. While flux density (tesla) describes field strength at a point, flux (weber) captures the integrated total through an entire surface. Think of it like water flow: flux density is velocity, flux is total volume flow rate. For a uniform field perpendicular to a surface: Φ = B × A. For angled or non-uniform fields, integration is required: Φ = ∫B·dA.
The SI unit is the weber (Wb), equal to volt-seconds (V·s) or tesla-square meters (T·m²). This volt-second relationship comes directly from Faraday's law: changing magnetic flux through a coil induces voltage, EMF = -dΦ/dt. A 1 Wb/s change induces 1 V. This principle underlies all generators, transformers, and electric motors. Magnetic flux also determines inductance: an inductor stores energy in its magnetic flux, and flux linkage (NΦ) relates to current and inductance by NΦ = LI.
Our converter handles all standard magnetic flux units used in physics, electrical engineering, and power systems.
Common Magnetic Flux Conversions
| From | To | Multiply By |
|---|---|---|
| Wb | maxwell (Mx) | 10⁸ |
| maxwell | Wb | 10⁻⁸ |
| Wb | V·s | 1 (equivalent) |
| Wb | T·m² | 1 (equivalent) |
| Wb | mWb | 1,000 |
| mWb | Wb | 0.001 |
| Wb | μWb | 10⁶ |
| kiloline | Wb | 10⁻⁵ |
Magnetic Flux Unit Reference
Weber (Wb) – The SI unit of magnetic flux, named after German physicist Wilhelm Weber (1804-1891). By definition: 1 Wb = 1 V·s = 1 T·m² = 1 kg·m²/(A·s²). A 1-weber change in flux through a single-turn coil induces 1 volt for 1 second. Typical values: transformer core at rated operation might have 0.1-1 Wb of peak flux; large power transformers can have 10+ Wb. The weber is a relatively large unit for everyday applications.
Maxwell (Mx) – The CGS unit of magnetic flux, equal to 10⁻⁸ Wb (one hundred-millionth of a weber). Named after James Clerk Maxwell. 1 Wb = 10⁸ Mx = 100 million maxwells. The maxwell was more convenient for early magnetic measurements when webers would have been unwieldy small fractions. Still encountered in older literature and some specialized applications.
Volt-second (V·s) – Alternative expression for the weber, emphasizing the relationship to Faraday's law. From EMF = -dΦ/dt, flux equals the time integral of voltage: Φ = ∫V dt. This notation is useful in power electronics and magnetic amplifier analysis where flux is controlled by applied volt-seconds.
Milliweber (mWb) – 10⁻³ Wb = 10⁵ maxwells. The practical unit for most magnetic circuit calculations. Typical inductor cores operate with milliwebers of flux. Convenient because most practical flux values fall in the 0.1-100 mWb range.
Microweber (μWb) – 10⁻⁶ Wb = 100 maxwells. Used for small magnetic circuits like read/write heads, small sensors, and MEMS devices. Also called the "unit pole" in some older references.
Line (magnetic line) – An informal term equal to one maxwell, derived from the concept of "lines of force" in magnetic field visualization. 1 line = 1 Mx = 10⁻⁸ Wb. The kiloline (1000 lines = 10⁻⁵ Wb) occasionally appears in older American engineering literature.