Magnetism converters
Magnetic Flux Converter
Convert magnetic flux units: weber, milliweber, maxwell and volt-second.
Result
1.00000e-8 Wb
1 Mx = 1.00000e-8 Wb
All units for this value
| Unit | Symbol | Value |
|---|---|---|
| Weber | Wb | 1.00000e-8 |
| Milliweber | mWb | 0.00001 |
| Microweber | µWb | 0.01 |
| Kiloweber | kWb | 1.00000e-11 |
| Volt second | V·s | 1.00000e-8 |
| Tesla square meter | T·m² | 1.00000e-8 |
| Maxwell | Mx | 1 |
| Kilomaxwell | kMx | 0.001 |
| Gauss square centimeter | G·cm² | 1 |
| Unit pole | unit pole | 0.0795775 |
About this calculator
Magnetic flux measures the total amount of magnetic field passing through a given surface, a key quantity behind transformer design, generator output, and Faraday's law of induction. This converter switches between the SI weber, the CGS maxwell, and equivalent forms like volt-second and tesla-square-meter.
How it works in plain English
The converter uses the weber as its common base unit, since one weber is defined as the flux that, decreasing steadily to zero in one second, induces one volt in a single-turn loop, making volt-second an exactly equivalent unit. Tesla-square-meter is likewise identical to the weber, because tesla itself is defined as weber per square meter, so multiplying flux density by area returns the weber directly.
The maxwell comes from the CGS system and equals exactly one hundred-millionth of a weber, or 1e-8 Wb, a factor that stems from the CGS system's smaller centimeter-based unit of area combined with its gauss-based flux density unit. Gauss-square-centimeter is defined identically to the maxwell, since gauss is the CGS flux density unit and multiplying it by an area in square centimeters gives the same numeric result.
Pick your from and to units, enter a value, and the converted magnetic flux appears immediately, along with a table listing that same quantity across every supported unit. A precision control sets the number of decimal places displayed, and a swap button reverses the two chosen units in one click.
The formula
- value_in_target = value_in_source × (source factor to weber) ÷ (target factor to weber)
- 1 maxwell (Mx) = 1e-8 weber
- 1 gauss·cm² = 1 maxwell = 1e-8 weber
- 1 volt-second = 1 tesla·m² = 1 weber
Worked example
Suppose a small transformer core datasheet reports a peak flux of 250,000 maxwells, a unit still used in some legacy magnetic-core specifications, and an engineer needs that value in webers for a modern SI-based calculation. Multiplying by the maxwell factor: 250,000 × 1e-8 = 0.0025 weber.
Entering 250,000 into the maxwell field with weber selected as the target shows 0.0025 Wb right away. Multiplying that 0.0025 weber result back by 1e8 returns the original 250,000 maxwells, a useful check that the conversion direction was correct. The full unit table also reports this same flux as 2.5 milliweber and 2500 microweber, all calculated from that single entered figure without any manual scientific-notation conversion, and scrolling through that same all-units table also shows the equivalent reading in gauss-square-centimeters for comparison against the maxwell figure.
Typical magnetic flux values
| Example | Approximate magnetic flux |
|---|---|
| Small signal transformer core | ≈1-10 microweber |
| Power transformer core (mains) | ≈0.001-0.01 weber |
| Large electric motor pole flux | ≈0.01-0.1 weber |
| Small bar magnet through a coil | ≈1-100 microweber |
| 1 maxwell | 1e-8 weber |
Standard unit definitions and general electromagnetics references
Frequently asked questions
What does magnetic flux actually measure?
It measures the total amount of magnetic field lines passing through a chosen surface, combining both the strength of the field and the area it passes through. A strong field through a small area and a weaker field through a larger area can produce the same total flux.
Why is volt-second an equivalent unit for magnetic flux?
Faraday's law states that the voltage induced in a loop equals the rate of change of magnetic flux through it, so integrating an induced voltage over time recovers the change in flux. Because of that relationship, volt-second and weber describe exactly the same physical quantity and can be used interchangeably.
Why is the maxwell such a small unit compared to the weber?
The maxwell belongs to the CGS system, which is built around the centimeter rather than the meter, making CGS units of area and consequently of flux much smaller than their SI counterparts. This is why one weber equals one hundred million maxwells rather than some more familiar round number.
How does magnetic flux relate to magnetic flux density?
Magnetic flux density, measured in tesla or gauss, describes the field strength per unit area at a point, while magnetic flux is that density multiplied by the area it passes through, giving a total rather than a per-area figure. Increasing either the field density or the area increases the total flux.
Can I convert an old maxwell-based specification straight to modern SI units?
Yes. Enter the maxwell value into the from field, choose weber, milliweber, or microweber as the target, and the converter applies the exact 1e-8 factor automatically. There is no need to manually track the powers of ten involved in the CGS-to-SI conversion.
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