Nominal inches to actual inches
Type a value in nominal to get it in in actual instantly.
5 1/2in actual
That's 1.57× as wide as a 4×4 post, while a 2×10 joist’s depth is 1.68× wider.
Convert the other way: in actual to nominal
What it means
How big is that board really?
Dry, surfaced softwood dimensions (PS 20). Convert each dimension separately: a 2×6 is 1½ by 5½ in. Hardwoods and rough-sawn lumber differ.
The math
How to convert nominal to in actual
Up to 6 in nominal, actual = nominal − ½ in; from 8 in, actual = nominal − ¾ in.
Example: 6 nominal = 5 1/2 in actual.
Every unit
That dimension in every unit
Tables
nominal to in actual conversion table
| nominal | in actual |
|---|---|
| 1 nominal | 3/4 in actual |
| 2 nominal | 1 1/2 in actual |
| 3 nominal | 2 1/2 in actual |
| 4 nominal | 3 1/2 in actual |
| 5 nominal | 4 1/2 in actual |
| 6 nominal | 5 1/2 in actual |
| 8 nominal | 7 1/4 in actual |
| 10 nominal | 9 1/4 in actual |
| 12 nominal | 11 1/4 in actual |
| 14 nominal | 13 1/4 in actual |
| 16 nominal | 15 1/4 in actual |
in actual to nominal conversion table
| in actual | nominal |
|---|---|
| 3/4 in actual | 1 nominal |
| 1 1/2 in actual | 2 nominal |
| 2 1/2 in actual | 3 nominal |
| 3 1/2 in actual | 4 nominal |
| 4 1/2 in actual | 5 nominal |
| 5 1/2 in actual | 6 nominal |
| 7 1/4 in actual | 8 nominal |
| 9 1/4 in actual | 10 nominal |
| 11 1/4 in actual | 12 nominal |
| 13 1/4 in actual | 14 nominal |
| 15 1/4 in actual | 16 nominal |
Quick answers
Quick answers
- How many in actual is 1 nominal?
- 1 nominal is 3/4 in actual.
- How many in actual is 10 nominal?
- 10 nominal is 9 1/4 in actual.
- How many in actual is 6 nominal?
- 6 nominal is 5 1/2 in actual.
The units
About these units
Nominal inches (nominal)
The name of the dimension: the 4 in 2×4.
Actual inches (in actual)
The real planed dimension in inches.
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