The unit of reluctance is the Ampere-Turn per Weber (AT/Wb) or equivalently, the reciprocal Henry (H^-1).

Reluctance, in the context of magnetic circuits, is analogous to resistance in electrical circuits. It represents the opposition to the establishment of a magnetic flux in a magnetic circuit. The relationship is defined by:

Reluctance (ℜ) = Magnetomotive Force (MMF) / Magnetic Flux (Φ)

• Magnetomotive Force (MMF) is measured in Ampere-Turns (AT).
• Magnetic Flux (Φ) is measured in Webers (Wb).

Therefore, the unit of Reluctance (ℜ) is AT/Wb or H^-1.