Magnetic Flux Converter
Magnetic flux is the total magnetic field passing through a surface, measured in webers (Wb) in the SI system, where one weber equals one volt-second. Magnetic flux is central to electromagnetism, electromagnetic induction, and the design of transformers, motors, and inductors. Different fields use different magnetic flux units: engineers and physicists working with modern SI systems use webers, milliwebers, and microwebers; older literature and some specialized contexts use CGS units like maxwells or lines (both equal to 10^-8 webers). Converting between magnetic flux units is necessary when reading component specifications, designing electromagnetic devices, performing laboratory measurements, and translating between SI and CGS literature. This calculator displays eight magnetic flux units simultaneously: nanowebers, microwebers, milliwebers, webers, kilowebers, megawebers, maxwells, and lines. Type a value into any field and all others update instantly.
Magnetic flux conversion factors
All conversions below use SI and CGS definitions, with all units expressed relative to the weber (Wb).
| Unit | Symbol | Webers (Wb) |
|---|---|---|
| Nanoweber | nWb | 0.000000001 |
| Microweber | μWb | 0.000001 |
| Milliweber | mWb | 0.001 |
| Weber | Wb | 1 |
| Kiloweber | kWb | 1,000 |
| Megaweber | MWb | 1,000,000 |
| Maxwell | Mx | 0.00000001 |
| Line | line | 0.00000001 |
Magnetic flux converter: frequently asked questions
What is magnetic flux?
Magnetic flux is a measure of the total magnetic field passing through a given area. The SI unit is the weber (Wb), defined as one volt-second (1 Wb = 1 V*s). It represents the integral of the magnetic field strength over an area. Magnetic flux is fundamental to electromagnetism and induction.
What is the relationship between webers and tesla?
The tesla (T) is the unit of magnetic flux density (field strength), while the weber (Wb) is the unit of magnetic flux. Magnetic flux equals magnetic field strength multiplied by area: flux (Wb) = magnetic field (T) × area (m²). The weber is a larger-scale measure of the total magnetic effect over an area.
What is a maxwell?
A maxwell (Mx) is a CGS unit of magnetic flux equal to 10^-8 webers. It is also called a line or unit of magnetic flux. Maxwells appear in older literature and some engineering references but are rarely used in modern SI-based work.
What is a line in magnetic flux?
A line is another name for a maxwell, a CGS unit of magnetic flux. One line equals 10^-8 webers. The term reflects a historical visualization of magnetic flux as invisible lines of force passing through space, a concept still used in magnetism education today.
Where is magnetic flux measurement used?
Magnetic flux measurement is used in designing transformers, inductors, and electric machines; testing magnetic materials; electromagnetic device calibration; and research in physics and materials science. Understanding magnetic flux units is essential for anyone working with electromagnetic systems.
Official sources
- SI Brochure (9th edition, 2019): The International System of Units. BIPM.
- NIST Special Publication 330: The International System of Units (SI).
Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. See our methodology.