A quick fraction-to-decimal shop reference for common steel thickness callouts.
Reviewed 2026-10-07
| Fraction | Decimal in | Approx mm |
|---|---|---|
| 1/16 | 0.0625 | 1.59 |
| 3/32 | 0.09375 | 2.38 |
| 1/8 | 0.125 | 3.18 |
| 3/16 | 0.1875 | 4.76 |
| 1/4 | 0.250 | 6.35 |
| 5/16 | 0.3125 | 7.94 |
| 3/8 | 0.375 | 9.53 |
| 1/2 | 0.500 | 12.70 |
| 5/8 | 0.625 | 15.88 |
| 3/4 | 0.750 | 19.05 |
| 1 | 1.000 | 25.40 |
Use it when a drawing calls out a common fraction and your calculator, caliper or supplier page uses decimal inches.
This is not a gauge conversion table. Gauge varies by material system. For gauge stock, verify the material-specific supplier thickness.
Assuming nominal thickness means an exact measured thickness. Mill tolerance can matter for precision work.
Tools that match this task — not a random product wall.
No. It is a fractional-to-decimal reference. Gauge requires a material-specific table.
Calculators, calipers and supplier specs commonly use decimals.
Nominal dimensions have tolerances. Use supplier/mill data for critical work.