Convert sheet metal gauge to millimeters instantly. Enter a value below, or use the formula and reference table further down the page.
In practice
Sheet metal gauge to millimetres is confusing because gauge numbers are not a universal standard: the same gauge number gives a different thickness for steel, stainless steel and aluminium, and a larger gauge number means thinner metal. For standard (mild) steel, 16 gauge is about 1.5 mm, 14 gauge about 1.9 mm and 11 gauge about 3.0 mm. Always check which material table applies before ordering, since 16 gauge stainless, galvanised steel and aluminium are each a slightly different thickness.
How to convert sheet metal gauge to millimeters
Multiply the value by 1.
mm = gauge × 1Example: 10 gauge = 10 mm.
Sheet Metal Gauge to Millimeters conversion table
| Sheet Metal Gauge (gauge) | Millimeters (mm) |
|---|---|
| 1 gauge | 1 mm |
| 2 gauge | 2 mm |
| 3 gauge | 3 mm |
| 4 gauge | 4 mm |
| 5 gauge | 5 mm |
| 10 gauge | 10 mm |
| 15 gauge | 15 mm |
| 20 gauge | 20 mm |
| 25 gauge | 25 mm |
| 50 gauge | 50 mm |
| 100 gauge | 100 mm |
Frequently asked questions
How many millimeters is 1 gauge?
1 gauge equals 1 millimeters.
What is the formula to convert gauge to mm?
To convert gauge to mm, multiply the value by 1. The full formula is: mm = gauge × 1.
How do I convert millimeters back to sheet metal gauge?
Use the same calculator above and type your value into the millimeters field instead — it converts in both directions. Or use the reverse formula: gauge = mm ÷ 1.
Is the gauge to mm conversion exact?
The conversion factor used here (1) is the standard internationally defined value. Results on this page are rounded to four decimal places for readability.