---
type: "sheet-metal-gauge"
gauge_number: "15"
material: "us-standard"
material_name: "U.S. Standard Gauge"
gauge_system: "USG"
thickness_in: 0.0703
thickness_mm: 1.7859
weight_lb_per_sqft: 2.8125
weight_kg_per_sqm: 13.73
standard: "15 U.S.C. 206; Manufacturers' Standard Gauge; Brown & Sharpe / AWG"
verified: "August 1, 2026"
url: https://shopmath.org/gauges/us-standard/15
---

# 15 Gauge U.S. Standard Gauge — Sheet Metal Thickness in Inches and Millimetres

15 gauge us standard is 0.0703 in (1.786 mm) thick. That figure is on the USG — gauge is a material-specific numbering scheme, not a unit, so the same number is a different thickness in another material.

- **Gauge**: 15
- **Material**: U.S. Standard Gauge
- **Gauge system**: USG
- **Thickness**: 0.0703 in (1.786 mm)
- **Weight**: 2.813 lb/ft² (13.73 kg/m²)

## 15 Gauge U.S. Standard Gauge Thickness

| Property | Value |
| --- | --- |
| Thickness (in) | 0.0703 |
| Thickness (mm) | 1.786 |
| Weight (lb/ft²) | 2.813 |
| Weight (kg/m²) | 13.73 |
| Gauge system | USG |

## 15 Gauge Across Materials

The same gauge number in every material this reference covers. They differ because each material carries its own gauge system, not because one chart is wrong.

| Material | Gauge system | Thickness (in) | Thickness (mm) | lb/ft² | kg/m² |
| --- | --- | --- | --- | --- | --- |
| [Sheet Aluminium](https://shopmath.org/gauges/aluminum/15.md) | B&S | 0.0571 | 1.450 |  |  |
| [Galvanized Steel](https://shopmath.org/gauges/galvanized/15.md) | galvanized-MSG | 0.0710 | 1.803 | 2.813 | 13.73 |
| [Sheet Steel](https://shopmath.org/gauges/steel/15.md) | MSG | 0.0673 | 1.708 | 2.813 | 13.73 |
| U.S. Standard Gauge (this page) | USG | 0.0703 | 1.786 | 2.813 | 13.73 |

## Sources and Method for 15 Gauge U.S. Standard Gauge

### U.S. Standard Gauge gauge thicknesses

- **Source**: 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
- **Method**: computed
- **Verified against**: Wikipedia Sheet metal, Standard sheet metal gauges table (CC BY-SA 4.0) — 137/137 checks passed at 0.05 mil

### Assumptions

- Gauge is a numbering scheme, not a unit. A thickness is only meaningful with its material and gauge system stated.
- Sheet is supplied to a mill tolerance around these nominal thicknesses; measure the stock when the fit matters.
- 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

## Common Questions About 15 Gauge U.S. Standard Gauge

### How thick is 15 gauge us standard?

15 gauge us standard is 0.0703 in (1.786 mm) thick, on the USG.

### What is 15 gauge in mm?

15 gauge us standard is 1.786 mm. Gauge is not a unit — the same number means a different thickness in a different material, so the material has to be stated with it.

### Is 15 gauge the same thickness in every material?

No. 15 gauge is 0.0703 in in u.s. standard gauge, but 0.0571 in in sheet aluminium, 0.0710 in in galvanized steel, 0.0673 in in sheet steel. Each material uses its own gauge system: B&S; galvanized-MSG; MSG; USG.

### How much does 15 gauge us standard weigh per square foot?

2.813 lb per square foot (13.73 kg per square metre).

## Related pages

- Thicker (lower gauge number): [14 gauge u.s. standard gauge](https://shopmath.org/gauges/us-standard/14.md) — 0.0781 in
- Thinner (higher gauge number): [16 gauge u.s. standard gauge](https://shopmath.org/gauges/us-standard/16.md) — 0.0625 in
- All u.s. standard gauge gauges: [U.S. Standard Gauge gauge chart](https://shopmath.org/gauges/us-standard.md)
- All materials and gauges: [Sheet metal gauge reference](https://shopmath.org/gauges.md)
- Full cross-material chart: [Sheet metal gauge chart](https://shopmath.org/charts/sheet-metal-gauge.md)

---

*Source: [ShopMath](https://shopmath.org/gauges/us-standard/15) — data verified August 1, 2026. Reference data; verify against the governing standard before manufacture.*