Number base converter
Octal to Decimal Converter
Convert octal numbers to decimal for programming, computer science, and digital logic.
Base converter
Octal to Decimal
Convert whole numbers between decimal, binary, hexadecimal, and octal.
Octal input can use only digits 0-7.
Result
8
Octal (base 8) to Decimal (base 10)
How Octal to Decimal Conversion Works
Octal uses base 8, while Decimal uses base 10. The converter first reads the input value in base 8, then writes the same whole number in base 10.
This tool supports whole numbers within JavaScript's safe integer range. Binary output is grouped in blocks of four digits so long results are easier to read.
Example Conversions
| Octal | Decimal |
|---|---|
| 10 | 8 |
| 17 | 15 |
| 77 | 63 |
| 377 | 255 |
FAQ
What does Octal to Decimal Converter do?
It converts a whole number written in Octal (base 8) into Decimal (base 10).
Is Octal to Decimal conversion exact?
Yes. Number base conversion rewrites the same whole number in another base, so the value itself does not change.
Can I use spaces in binary or hex input?
Yes. Spaces are ignored, so grouped binary like 1010 1101 is accepted.
Is this converter private?
Yes. The conversion runs locally in your browser and does not need a database or paid API.