Convert lumber nominal size to actual size (inches) instantly. Enter a value below, or use the formula and reference table further down the page.
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How to convert lumber nominal size to actual size (inches)
Multiply the value by 1.
in = nominal × 1Example: 10 nominal = 10 in.
Lumber Nominal Size to Actual Size (inches) conversion table
| Lumber Nominal Size (nominal) | Actual Size (inches) (in) |
|---|---|
| 1 nominal | 1 in |
| 2 nominal | 2 in |
| 3 nominal | 3 in |
| 4 nominal | 4 in |
| 5 nominal | 5 in |
| 10 nominal | 10 in |
| 15 nominal | 15 in |
| 20 nominal | 20 in |
| 25 nominal | 25 in |
| 50 nominal | 50 in |
| 100 nominal | 100 in |
Frequently asked questions
How many actual size (inches) is 1 nominal size?
1 nominal size equals 1 actual size (inches).
What is the formula to convert nominal to in?
To convert nominal to in, multiply the value by 1. The full formula is: in = nominal × 1.
How do I convert actual size (inches) back to lumber nominal size?
Use the same calculator above and type your value into the actual size (inches) field instead — it converts in both directions. Or use the reverse formula: nominal = in ÷ 1.
Is the nominal to in 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.