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Decimal to Octal Converter
Enter a decimal number to see its octal, binary, and hexadecimal equivalents.
How this decimal to octal converter works
This tool converts a decimal (base-10) whole number into its octal (base-8) equivalent. Octal uses only the digits 0 through 7.
The conversion repeatedly divides the decimal number by 8 and records each remainder, then reads the remainders from last to first to build the octal result. The calculator also shows the equivalent binary and hexadecimal values for comparison.
Negative numbers are treated as zero. This tool is intended for general learning and reference purposes.
Last reviewed August 2026