Mathematically it is represented as B = Φ/A where B is magnetic flux density in teslas (T), Φ is magnetic flux in webers (Wb), and A is area in square meters (m2). The SI unit for magnetic flux density is the tesla which is equivalent to webers per square meter.
In SI units, B is measured in teslas (symbol: T)
and correspondingly ΦB(magnetic flux) is measured in webers (symbol: Wb)
so that a flux density of 1 Wb/m2 is 1 tesla.
The SI unit of magnetic flux is the weber (Wb) (in derived units: volt seconds), and the CGS unit is the maxwell. Magnetic flux is usually measured with a fluxmeter, which contains measuring coils and electronics, that evaluates the change of voltage in the measuring coils to calculate the magnetic flux.