Magnetic Reluctance
Calculate the reluctance of a magnetic path from its length, area and relative permeability, free online.
About this calculator
Reluctance โ = l รท (ฮผโ ฮผแตฃ A), the magnetic analogue of electrical resistance, measured in ampere-turns per weber. Air gaps have a very high reluctance compared with iron, so even a tiny gap dominates a magnetic circuit.