- Enter the Decimal to Octal 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.
Decimal to Octal Converter
Convert decimal numbers (base-10) to octal numbers (base-8) with this simple online tool.
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How to Use This Tool
Learn More About Decimal to Octal Converter
Decimal to Octal Conversion
To convert a decimal number to octal, repeatedly divide the decimal number by 8, noting the remainder at each step. The octal digits are the remainders, read in reverse order.
Example
Decimal: 19
19 / 8 = 2, remainder 3 2 / 8 = 0, remainder 2
Octal: 23 (reading remainders in reverse)
About
Convert decimal numbers (base-10) to octal numbers (base-8) with this simple online tool. Octal uses digits 0 through 7 and is commonly used in Unix file permissions (chmod) and legacy computing systems. Just enter a decimal integer, and the converter will instantly display its octal equivalent. For example, the decimal number 64 becomes 100 in octal. This tool is particularly useful for system administrators and developers working with Unix-like operating systems.
Examples
Decimal 10
Decimal number
Input
10
Output
12
Decimal 255
Decimal number
Input
255
Output
377
Use Cases
- Computer science education and learning about octal numbers
- File permission settings in Unix-like operating systems
- Embedded systems programming
- Representing data in a compact format