- Enter the Octal to Decimal Converter input in the field on the page.
- Click "Convert" to run the tool in your browser.
- Read the result below the form and copy it if you need it in another app.
Octal to Decimal Converter
Convert octal numbers (base-8) to decimal numbers (base-10) with this simple online tool.
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How to Use This Tool
Learn More About Octal to Decimal Converter
Octal and Decimal Number Systems
The octal number system is a base-8 system, using digits from 0 to 7. Each position in an octal number represents a power of 8. The decimal number system is a base-10 system, using digits from 0 to 9.
Example
Octal: 23
Decimal: (2 8^1) + (3 8^0) = 16 + 3 = 19
About
Convert octal numbers (base-8) to decimal numbers (base-10) with this simple online tool. Each octal digit represents a power of 8, so 17 in octal equals 8+7 = 15 in decimal. Just enter an octal string using digits 0 through 7, and the converter will instantly display its decimal equivalent. Commonly used to decode Unix permission values and interpret legacy system output. This tool is essential for system administrators working with file permissions.
Examples
Valid octal
Octal number
Input
10
Output
8
Zero
Octal number
Input
0
Output
0
Use Cases
- Computer science education and learning number systems
- Software development for handling file permissions
- Digital electronics and embedded systems programming
- Understanding different data representations