Gauge numbers are convenient shop shorthand, but the same gauge can mean different thicknesses by material.
Reviewed 2026-10-07
Sheet-metal gauge is a table system, not a direct mathematical unit. Carbon steel, stainless and nonferrous sheets can use different thicknesses for the same gauge number.
For quoting, weight and fit-up, use the decimal thickness shown by your supplier or measure the material with a suitable caliper/micrometer when appropriate.
Typing “16” into a weight calculator as if it were .16 in, or copying a carbon-steel gauge chart to aluminum.
Tools that match this task — not a random product wall.
No. Gauge systems differ by material. Use the correct material-specific table or actual decimal thickness.
Use decimal thickness from the supplier or measurement for better results.
Manufacturing tolerances and coating can change measured thickness.