--- type: "gauge-material" material: "aluminum" name: "Sheet Aluminium" gauge_system: "B&S" gauge_count: 33 thickest_gauge: "3" thinnest_gauge: "35" range_in: "0.0056–0.2294" standard: "15 U.S.C. 206; Manufacturers' Standard Gauge; Brown & Sharpe / AWG" verified: "August 1, 2026" url: https://shopmath.org/gauges/aluminum --- # Sheet Aluminium Gauge Chart — All 33 Gauges in Inches and Millimetres Sheet Aluminium is gauged on the B&S, running from 3 ga at 0.2294 in (5.827 mm) down to 35 ga at 0.0056 in (0.143 mm). A higher gauge number is thinner metal, and the same number means a different thickness in another material — the system is what makes the number mean anything. - **Material**: Sheet Aluminium - **Gauge system**: B&S - **Gauges**: 33 - **Thickest**: 3 ga — 0.2294 in - **Thinnest**: 35 ga — 0.0056 in - **Standard**: 15 U.S.C. 206; Manufacturers' Standard Gauge; Brown & Sharpe / AWG ## Every Sheet Aluminium Gauge | Gauge | Thickness (in) | Thickness (mm) | | --- | --- | --- | | [3 ga](https://shopmath.org/gauges/aluminum/3.md) | 0.2294 | 5.827 | | [4 ga](https://shopmath.org/gauges/aluminum/4.md) | 0.2043 | 5.189 | | [5 ga](https://shopmath.org/gauges/aluminum/5.md) | 0.1819 | 4.621 | | [6 ga](https://shopmath.org/gauges/aluminum/6.md) | 0.1620 | 4.115 | | [7 ga](https://shopmath.org/gauges/aluminum/7.md) | 0.1443 | 3.665 | | [8 ga](https://shopmath.org/gauges/aluminum/8.md) | 0.1285 | 3.264 | | [9 ga](https://shopmath.org/gauges/aluminum/9.md) | 0.1144 | 2.906 | | [10 ga](https://shopmath.org/gauges/aluminum/10.md) | 0.1019 | 2.588 | | [11 ga](https://shopmath.org/gauges/aluminum/11.md) | 0.0907 | 2.305 | | [12 ga](https://shopmath.org/gauges/aluminum/12.md) | 0.0808 | 2.053 | | [13 ga](https://shopmath.org/gauges/aluminum/13.md) | 0.0720 | 1.828 | | [14 ga](https://shopmath.org/gauges/aluminum/14.md) | 0.0641 | 1.628 | | [15 ga](https://shopmath.org/gauges/aluminum/15.md) | 0.0571 | 1.450 | | [16 ga](https://shopmath.org/gauges/aluminum/16.md) | 0.0508 | 1.291 | | [17 ga](https://shopmath.org/gauges/aluminum/17.md) | 0.0453 | 1.149 | | [18 ga](https://shopmath.org/gauges/aluminum/18.md) | 0.0403 | 1.024 | | [19 ga](https://shopmath.org/gauges/aluminum/19.md) | 0.0359 | 0.912 | | [20 ga](https://shopmath.org/gauges/aluminum/20.md) | 0.0320 | 0.812 | | [21 ga](https://shopmath.org/gauges/aluminum/21.md) | 0.0285 | 0.723 | | [22 ga](https://shopmath.org/gauges/aluminum/22.md) | 0.0253 | 0.644 | | [23 ga](https://shopmath.org/gauges/aluminum/23.md) | 0.0226 | 0.573 | | [24 ga](https://shopmath.org/gauges/aluminum/24.md) | 0.0201 | 0.511 | | [25 ga](https://shopmath.org/gauges/aluminum/25.md) | 0.0179 | 0.455 | | [26 ga](https://shopmath.org/gauges/aluminum/26.md) | 0.0159 | 0.405 | | [27 ga](https://shopmath.org/gauges/aluminum/27.md) | 0.0142 | 0.361 | | [28 ga](https://shopmath.org/gauges/aluminum/28.md) | 0.0126 | 0.321 | | [29 ga](https://shopmath.org/gauges/aluminum/29.md) | 0.0113 | 0.286 | | [30 ga](https://shopmath.org/gauges/aluminum/30.md) | 0.0100 | 0.255 | | [31 ga](https://shopmath.org/gauges/aluminum/31.md) | 0.0089 | 0.227 | | [32 ga](https://shopmath.org/gauges/aluminum/32.md) | 0.0080 | 0.202 | | [33 ga](https://shopmath.org/gauges/aluminum/33.md) | 0.0071 | 0.180 | | [34 ga](https://shopmath.org/gauges/aluminum/34.md) | 0.0063 | 0.160 | | [35 ga](https://shopmath.org/gauges/aluminum/35.md) | 0.0056 | 0.143 | _Sheet is supplied to a mill tolerance around these nominal thicknesses; measure the stock when the fit matters._ ## Sources and Method for the Sheet Aluminium Gauge Chart ### Sheet Aluminium 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 ### Formulas **Brown & Sharpe geometric series** ```text t(n) = 0.325 × (0.890525)^n inches ``` ### Assumptions - Gauge is a numbering scheme, not a unit. A thickness is only meaningful with its material and gauge system stated. - 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 ## Related pages - All materials: [Sheet metal gauge reference](https://shopmath.org/gauges.md) - Every material side by side: [Sheet metal gauge chart](https://shopmath.org/charts/sheet-metal-gauge.md) --- *Source: [ShopMath](https://shopmath.org/gauges/aluminum) — data verified August 1, 2026. Reference data; verify against the governing standard before manufacture.*