In this article
OCT2DEC converts a octal number to decimal. Used for device codes, permission bits, memory addresses and number-system lessons.
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Syntax
=OCT2DEC(number)| Argument | What it means |
|---|---|
number |
Octal number (as text or a number) |
Examples
Example 1
=OCT2DEC(A2)Result: 15. See the worked example table below for more cases.
OCT2DEC in practice
Where you will use it
- Reading octal values from device or network logs
- Teaching number systems
- Converting codes for systems that expect decimal
Worked example
| Input | Formula | Result |
|---|---|---|
| 17 | =OCT2DEC(A2) | 15 |
| 777 | =OCT2DEC(A3) | 511 |
| 7777777777 | =OCT2DEC(A4) | -1 |
Results calculated in Excel.
Mistakes people make
| Mistake | What to do instead |
|---|---|
| Input too long or invalid digits | #NUM!; check the digits allowed in the base |
| Negative results | Large inputs use two's complement (10 characters) |
Related functions
📚 Part of the free Excel course: Beginner → Expert · Try it in the Formula Lab or ask the AI Helper.
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