NEMA Enclosure Calculator

Inputs (inches)

Width (W) Height (H) Depth (D) Material density

Gauge	—
Split Cover	No
Thickness (in)	—
Longest side (in)	—
Four‑sides area (ft²)	—
Estimated weight (lb)	—

Gauge Rules

16 ga if: (i) two sides ≤ 22", or (ii) largest side = 31" and the other two ≤ 25".
14 ga if: (i) two sides ≤ 33", or (ii) largest side = 47" and the other two ≤ 38".
12 ga otherwise.

Split Cover Rules

16 ga: Yes if W > 24 or H > 24 or W×H > 360.
14 ga: Yes if W > 40 or H > 40 or W×H > 1000.
12 ga: Yes if W > 60 or H > 60 or W×H > 1500.