The Magnetic Field Calculator determines the strength of the magnetic field produced by a straight current-carrying wire at a specific distance using the formula B=μ0I2πrB = \frac{μ₀ I}{2πr}B=2πrμ0​I​, where BBB is the magnetic field in tesla, μ0μ₀μ0​ is the permeability of free space, III is the current in amperes, and rrr is the distance in meters from the wire. This calculator instantly provides accurate results, helping students, physicists, and engineers analyze magnetic fields around conductors, study electromagnetism, and understand how current generates magnetic effects in electrical circuits.