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Metal Thickness Gauge Chart
Standard metal thickness gauge conversions for steel and aluminum sheet metal
Steel Sheet Metal Gauge
| Gauge | Decimal (in) | Metric (mm) | Weight (oz/ft²) |
|---|---|---|---|
| 30 | 0.0120 | 0.305 | 0.500 |
| 29 | 0.0135 | 0.343 | 0.563 |
| 28 | 0.0149 | 0.378 | 0.625 |
| 27 | 0.0164 | 0.417 | 0.688 |
| 26 | 0.0179 | 0.455 | 0.750 |
| 25 | 0.0209 | 0.531 | 0.875 |
| 24 | 0.0239 | 0.607 | 1.000 |
| 23 | 0.0269 | 0.683 | 1.125 |
| 22 | 0.0299 | 0.759 | 1.250 |
| 21 | 0.0329 | 0.836 | 1.375 |
| 20 | 0.0359 | 0.912 | 1.500 |
| 19 | 0.0418 | 1.062 | 1.750 |
| 18 | 0.0478 | 1.214 | 2.000 |
| 17 | 0.0538 | 1.367 | 2.250 |
| 16 | 0.0598 | 1.519 | 2.500 |
| 15 | 0.0673 | 1.709 | 2.813 |
| 14 | 0.0747 | 1.897 | 3.125 |
| 13 | 0.0897 | 2.278 | 3.750 |
| 12 | 0.1046 | 2.657 | 4.375 |
| 11 | 0.1196 | 3.038 | 5.000 |
| 10 | 0.1345 | 3.416 | 5.625 |
| 9 | 0.1495 | 3.797 | 6.250 |
| 8 | 0.1644 | 4.176 | 6.875 |
| 7 | 0.1793 | 4.554 | 7.500 |
| 6 | 0.1943 | 4.935 | 8.125 |
| 5 | 0.2092 | 5.314 | 8.750 |
| 4 | 0.2242 | 5.695 | 9.375 |
| 3 | 0.2391 | 6.073 | 10.000 |
Aluminum Sheet Metal Gauge
| Gauge | Decimal (in) | Metric (mm) | Weight (oz/ft²) |
|---|---|---|---|
| 30 | 0.0100 | 0.254 | 0.139 |
| 28 | 0.0126 | 0.320 | 0.174 |
| 26 | 0.0159 | 0.404 | 0.219 |
| 24 | 0.0201 | 0.511 | 0.278 |
| 22 | 0.0253 | 0.643 | 0.350 |
| 20 | 0.0320 | 0.813 | 0.442 |
| 18 | 0.0403 | 1.024 | 0.557 |
| 16 | 0.0508 | 1.290 | 0.702 |
| 14 | 0.0641 | 1.628 | 0.886 |
| 12 | 0.0808 | 2.053 | 1.117 |
| 10 | 0.1019 | 2.588 | 1.408 |
| 8 | 0.1285 | 3.264 | 1.776 |
| 6 | 0.1620 | 4.115 | 2.240 |
| 4 | 0.2043 | 5.189 | 2.824 |
| 2 | 0.2576 | 6.543 | 3.560 |
| 0 | 0.3249 | 8.252 | 4.491 |
Understanding Metal Gauge
Key Points:
- • Higher gauge numbers = thinner material
- • Lower gauge numbers = thicker material
- • Steel and aluminum have different gauge standards
- • Weight is measured in ounces per square foot
Common Applications:
- • 20-24 gauge: Light fabrication, ductwork
- • 16-18 gauge: General sheet metal work
- • 12-14 gauge: Structural applications
- • 8-10 gauge: Heavy-duty fabrication