Engineering Resource Hub

Magnetic Shielding Calculator

Estimate how much mu-metal or low-carbon steel it takes to contain a magnetic field to a target level — a single-layer, first-pass sizing tool for early design work.

Field & Enclosure

Field units

Source field at the shield wall

Don't have this number? Estimate it with our Pull Force Calculator.

Target / allowable residual field Enclosure geometry

Enclosure size units

Enclosure diameter Shielding material

Result

Required wall thickness

—

enter field and enclosure values

Required shielding factor—

Attenuation—

Geometry—

Material permeability (μr)—

Single-layer, thin-shell, DC/quasi-static estimate (spherical: SF = 1 + (2/3)·μ_r·t/r; cylindrical, transverse field: SF = 1 + μ_r·t/D). Real enclosures lose performance at seams, apertures, cable ports, and corners, and permeability varies by alloy, anneal, and field level. Treat this as a starting point for early design — safety-rated or high-stakes shielding (MRI suites, implant-adjacent equipment) should be verified by a shielding specialist with FEA modeling.

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Magnetic Shielding Calculator

Field & Enclosure

Result