Magnetic Flux converter

The weber is the SI base unit of magnetic flux used throughout this table, and two other entries are really the same quantity under a different name: a volt second (V·s) and a tesla square meter (T·m²) both equal exactly one weber, since flux is what you get when you integrate voltage over time or multiply a uniform flux density by the area it passes through. The maxwell is the CGS equivalent, and because that older system scales magnetic quantities very differently from SI, one weber works out to a round 100,000,000 maxwell. This overlap of names for the same physical quantity is intentional: engineers pick whichever label matches the equation they're already working with, rather than treating weber, volt-second, and tesla square meter as three different things to convert between.

Working outward from the weber, the usual metric prefixes apply directly: a milliweber is a thousandth of a weber and a microweber is a millionth, while on the maxwell side a kilomaxwell groups a thousand maxwell together — useful because a single maxwell describes such a small flux that raw instrument readings are rarely given in it directly.

For the weber-to-maxwell pair, the rule is Mx = Wb × 100,000,000, and reversing it means multiplying by 1e-8 (equivalent to dividing by 100 million).

A generator coil producing 2.5 Wb of flux is carrying 250,000,000 Mx by that formula. At the other end of the scale, a small flux of 300 microweber (0.0003 Wb) works out to 30,000 Mx — still a large-looking maxwell figure for a tiny real-world flux, which is part of why the CGS unit feels awkward next to modern SI numbers. Converting back, a reading of 5,000,000 Mx returns to exactly 0.05 Wb, confirming the two formulas are exact inverses of each other — a useful check whenever you're verifying a conversion tool against a hand calculation.

Magnetic flux shows up wherever a changing magnetic field drives a voltage: transformer and motor designers size laminated cores around a maximum flux in webers before the iron saturates, physics courses work Faraday's-law problems in webers per second, and older instrument scales and geophysical survey archives still report results in maxwell, so converting between the two is routine when matching legacy data to current designs.

A common mix-up is reaching for flux density (teslas) when the question is really about total flux (webers) — flux density describes field strength at a point, while flux is that density multiplied by an area, so the two only match numerically when the area happens to be exactly one square meter. The CGS unit pole is another trap: it isn't a flux value at all but a pole strength that radiates 4π maxwell through any sphere surrounding it, which is why its factor involves π instead of a round number.

The milliweber-to-weber quick pair reflects the fact that lab-scale flux measurements — from a small search coil or a magnetic flow sensor — often sit in the milliweber range rather than whole webers; converting 750 mWb to weber is simply 0.75 Wb, a reminder that the base unit itself is often inconveniently large for bench-top apparatus. Flux meters and fluxgate calibration equipment typically display readings in milliweber or microweber for exactly this reason, only moving up to whole webers when reporting totals for large industrial machinery such as power transformers or generator stators.