Decimal to Octal Converter
Free online decimal to octal converter with steps — instant, accurate decimal to octal conversion in your browser.
Supports arbitrarily large non-negative integers (BigInt under the hood).
About decimal to octal conversion
Number bases are just different ways of writing the same value: binary (base 2) uses digits 0–1, octal (base 8) uses 0–7, decimal (base 10) uses 0–9 and hexadecimal (base 16) uses 0–9 plus A–F. This converter parses your input as an arbitrary-precision integer and re-renders it in the target base — instantly and privately, in your browser.
Quick reference
1010in binary =12in octal =10in decimal =Ain hexadecimal- Hexadecimal digits:
A=10, B=11, C=12, D=13, E=14, F=15 - Each octal digit maps to exactly 3 binary digits; each hex digit maps to exactly 4
Frequently asked questions
How do I convert decimal to octal manually?
Repeatedly divide the decimal number by 8, writing down each remainder — then read the remainders from bottom to top. This tool does it instantly for any size of number.
What is decimal 500 in octal?
500 in decimal equals 764 in octal.
Is this converter free and private?
Yes — free, no sign-up, and the conversion runs locally in your browser using arbitrary-precision integers. Nothing is uploaded.