Decimal to Octal Converter
Enter a decimal number to get its octal representation. Commonly needed for setting Unix file permissions and understanding base-8 arithmetic.
Decimal to Octal
Base 10 → Base 8
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How to Use the Decimal to Octal Converter
1
Enter a decimal number.
2
Click Convert.
3
View the octal equivalent.
Frequently Asked Questions
How is decimal converted to octal?
Divide by 8 repeatedly, recording remainders. Read remainders bottom to top.
Why is octal useful for permissions?
Each octal digit maps to 3 permission bits (read/write/execute), making chmod values intuitive.
What digits are valid in octal?
Only 0 through 7. Digits 8 and 9 are not valid in octal.