Sheet metal · Steel · Manufacturers' Standard Gauge (MSG)

Sheet Steel Gauge Chart — Thickness in Inches and Millimetres

Name: Sheet Steel sheet gauge thicknesses
Creator: ShopMath

https://shopmath.org/gauges/steel · data verified August 1, 2026

Sheet Steel runs from 3 gauge at 0.2391 in (6.074 mm) down to 36 gauge at 0.0067 in (0.171 mm), 34 sizes in all. Mild, cold-rolled and hot-rolled sheet steel on the Manufacturers' Standard Gauge.

Gauges: 34
Thickest: 3 ga
Thinnest: 36 ga
System: Manufacturers' Standard Gauge (MSG)

Every Steel Sheet Gauge and Its Thickness

34 gauges on the Manufacturers' Standard Gauge (MSG), thickest first. A lower gauge number is thicker sheet, and the steps are geometric rather than even.

Sheet Steel sheet gauge thicknesses
Property	Thickness		Weight
Gauge	in	mm	lb/ft²	kg/m²
3 ga	0.2391	6.074	10.00	48.82
4 ga	0.2242	5.694	9.38	45.77
5 ga	0.2092	5.314	8.75	42.72
6 ga	0.1943	4.935	8.13	39.67
7 ga	0.1793	4.555	7.50	36.62
8 ga	0.1644	4.176	6.88	33.57
9 ga	0.1495	3.796	6.25	30.52
10 ga	0.1345	3.416	5.63	27.46
11 ga	0.1196	3.037	5.00	24.41
12 ga	0.1046	2.657	4.38	21.36
13 ga	0.0897	2.278	3.75	18.31
14 ga	0.0747	1.898	3.13	15.26
15 ga	0.0673	1.708	2.81	13.73
16 ga	0.0598	1.518	2.50	12.21
17 ga	0.0538	1.367	2.25	10.99
18 ga	0.0478	1.215	2.00	9.77
19 ga	0.0418	1.063	1.75	8.54
20 ga	0.0359	0.911	1.50	7.32
21 ga	0.0329	0.835	1.38	6.71
22 ga	0.0299	0.759	1.25	6.10
23 ga	0.0269	0.683	1.13	5.49
24 ga	0.0239	0.607	1.00	4.88
25 ga	0.0209	0.531	0.88	4.27
26 ga	0.0179	0.456	0.75	3.66
27 ga	0.0164	0.418	0.69	3.36
28 ga	0.0149	0.380	0.63	3.05
29 ga	0.0135	0.342	0.56	2.75
30 ga	0.0120	0.304	0.50	2.44
31 ga	0.0105	0.266	0.44	2.14
32 ga	0.0097	0.247	0.41	1.98
33 ga	0.0090	0.228	0.38	1.83
34 ga	0.0082	0.209	0.34	1.68
35 ga	0.0075	0.190	0.31	1.53
36 ga	0.0067	0.171	0.28	1.37

Thicknesses are nominal, before mill tolerance. Weights are for the base material at the nominal thickness.

Sources and Method for the Steel Gauge Chart

Sheet 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 Manufacturers' Standard Gauge (MSG). 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 this data is built and checked →

How to Cite This Steel Gauge Chart

Citation

ShopMath. "Sheet Steel Gauge Chart — Thickness in Inches and Millimetres." ShopMath, verified August 1, 2026, https://shopmath.org/gauges/steel

BibTeX

@misc{shopmath-gauges-steel,
  title        = {Sheet Steel Gauge Chart — Thickness in Inches and Millimetres},
  author       = {{ShopMath}},
  year         = {2026},
  howpublished = {\url{https://shopmath.org/gauges/steel}},
  note         = {Data verified 2026-08-01}
}

Permanent URL

https://shopmath.org/gauges/steel

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