# Sheet Steel Gauge

When working with sheet metal, the term "gauge or gage" is often used, and is used to indicate the thickness of a metal sheet.

Gauge (Ga) is a unit of length for diameters originating in North America and belongs to the Browne & Sharpe measurement system. Originally used in the fields of medicine and jewelry, the larger the number, the smaller the diameter, and now it is also used to indicate thickness.

Ga is different from inches; there is no conversion formula. Even if the non-ferrous metal sheet and the steel sheet have the same Ga, the thickness is actually different.

You can find the conversion from Ga to Milimeters for sheet metal in the table below.

 Gauge Number Standard Steel Galvanized Steel Stainless Steel Aluminum, Brass, Copper 3 6.073 5.827 4 5.095 5.954 5.189 5 5.314 5.555 4.62 6 4.935 5.159 4.115 7 4.554 4.763 3.665 8 4.176 4.191 3.264 9 3.797 3.891 3.967 2.906 10 3.416 3.51 3.571 2.588 11 3.038 3.132 3.175 2.304 12 2.657 2.753 2.779 2.052 13 2.278 2.372 2.38 1.829 14 1.897 1.994 1.984 1.628 15 1.709 1.803 1.786 1.45 16 1.519 1.613 1.588 1.29 17 1.367 1.461 1.427 1.151 18 1.214 1.311 1.27 1.024 19 1.062 1.158 1.11 0.912 20 0.912 1.006 0.953 0.813 21 0.836 0.93 0.874 0.724 22 0.759 0.853 0.792 0.643 23 0.683 0.777 0.714 0.574 24 0.607 0.701 0.635 0.536 25 0.531 0.627 0.556 0.455 26 0.455 0.551 0.475 0.404 27 0.417 0.513 0.437 0.361 28 0.378 0.475 0.396 0.32 29 0.343 0.437 0.358 0.287 30 0.305 0.399 0.318 0.254 31 0.267 0.361 0.277 0.226 32 0.246 0.34 0.259 0.203 33 0.229 0.239 0.18 34 0.208 0.218 0.16 35 0.191 0.198 0.142 36 0.17 0.178 0.127 37 0.163 0.168 0.113 38 0.17 0.157 0.101

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