Sheet metal · Galvanized · MSG plus zinc coating allowance
Galvanized Steel Gauge Chart — Thickness in Inches and Millimetres
https://shopmath.org/gauges/galvanized · data verified August 1, 2026
Galvanized Steel runs from 9 gauge at 0.1532 in (3.891 mm) down to 32 gauge at 0.0135 in (0.342 mm), 24 sizes in all. Galvanized sheet — MSG steel thickness plus a 2.5 oz/ft2 zinc coating allowance.
- Gauges
- 24
- Thickest
- 9 ga
- Thinnest
- 32 ga
- System
- MSG plus zinc coating allowance
Every Galvanized Sheet Gauge and Its Thickness
24 gauges on the MSG plus zinc coating allowance, thickest first. A lower gauge number is thicker sheet, and the steps are geometric rather than even.
| Property | Thickness | Weight | ||
|---|---|---|---|---|
| Gauge | in | mm | lb/ft² | kg/m² |
| 9 ga | 0.1532 | 3.891 | 6.25 | 30.52 |
| 10 ga | 0.1382 | 3.511 | 5.63 | 27.46 |
| 11 ga | 0.1233 | 3.132 | 5.00 | 24.41 |
| 12 ga | 0.1084 | 2.752 | 4.38 | 21.36 |
| 13 ga | 0.0934 | 2.373 | 3.75 | 18.31 |
| 14 ga | 0.0785 | 1.993 | 3.13 | 15.26 |
| 15 ga | 0.0710 | 1.803 | 2.81 | 13.73 |
| 16 ga | 0.0635 | 1.613 | 2.50 | 12.21 |
| 17 ga | 0.0575 | 1.462 | 2.25 | 10.99 |
| 18 ga | 0.0516 | 1.310 | 2.00 | 9.77 |
| 19 ga | 0.0456 | 1.158 | 1.75 | 8.54 |
| 20 ga | 0.0396 | 1.006 | 1.50 | 7.32 |
| 21 ga | 0.0366 | 0.930 | 1.38 | 6.71 |
| 22 ga | 0.0336 | 0.854 | 1.25 | 6.10 |
| 23 ga | 0.0306 | 0.778 | 1.13 | 5.49 |
| 24 ga | 0.0276 | 0.702 | 1.00 | 4.88 |
| 25 ga | 0.0247 | 0.626 | 0.88 | 4.27 |
| 26 ga | 0.0217 | 0.550 | 0.75 | 3.66 |
| 27 ga | 0.0202 | 0.512 | 0.69 | 3.36 |
| 28 ga | 0.0187 | 0.474 | 0.63 | 3.05 |
| 29 ga | 0.0172 | 0.436 | 0.56 | 2.75 |
| 30 ga | 0.0157 | 0.399 | 0.50 | 2.44 |
| 31 ga | 0.0142 | 0.361 | 0.44 | 2.14 |
| 32 ga | 0.0135 | 0.342 | 0.41 | 1.98 |
Thicknesses are nominal, before mill tolerance. Weights are for the base material at the nominal thickness.
Sources and Method for the Galvanized Gauge Chart
- Galvanized Steel thicknessescomputed
15 U.S.C. 206 (Act of Mar. 3, 1893, ch. 221, 27 Stat. 746) — U.S. Standard Gauge for sheet and plate iron and steel; 15 U.S.C. 206 statutory weights; MSG (41.82 lb/ft2 per inch), galvanized zinc allowance, and Brown & Sharpe formula per docs/research/data-sourcing.md §3.7
Verified against Wikipedia Sheet metal, Standard sheet metal gauges table (CC BY-SA 4.0) — 137/137 checks passed at 0.05 mil
Computed from the standard's formulas, then checked against published tables.
- Assumptions
- Thicknesses are nominal; mill tolerance is not part of the gauge definition.
- Gauge numbers here index the MSG plus zinc coating allowance. The same number on another material is a different thickness.
- Dataset scope: EXCLUDED: stainless steel (genuinely ambiguous convention, only one source in hand), zinc, copper, brass, steel tube wall.
- Data last verified
- August 1, 2026
How to Cite This Galvanized Gauge Chart
Citation
ShopMath. "Galvanized Steel Gauge Chart — Thickness in Inches and Millimetres." ShopMath, verified August 1, 2026, https://shopmath.org/gauges/galvanized
BibTeX
@misc{shopmath-gauges-galvanized,
title = {Galvanized Steel Gauge Chart — Thickness in Inches and Millimetres},
author = {{ShopMath}},
year = {2026},
howpublished = {\url{https://shopmath.org/gauges/galvanized}},
note = {Data verified 2026-08-01}
}Permanent URL
https://shopmath.org/gauges/galvanized