Number base converter
Decimal to Octal Converter
Convert decimal numbers to octal for programming, computer science, and digital logic.
Base converter
Decimal to Octal
Convert whole numbers between decimal, binary, hexadecimal, and octal.
Decimal input can use digits 0-9, with an optional minus sign.
Result
12
Decimal (base 10) to Octal (base 8)
How Decimal to Octal Conversion Works
Decimal uses base 10, while Octal uses base 8. The converter first reads the input value in base 10, then writes the same whole number in base 8.
This tool supports whole numbers within JavaScript's safe integer range. Binary output is grouped in blocks of four digits so long results are easier to read.
Example Conversions
| Decimal | Octal |
|---|---|
| 10 | 12 |
| 15 | 17 |
| 128 | 200 |
| 255 | 377 |
FAQ
What does Decimal to Octal Converter do?
It converts a whole number written in Decimal (base 10) into Octal (base 8).
Is Decimal to Octal conversion exact?
Yes. Number base conversion rewrites the same whole number in another base, so the value itself does not change.
Can I use spaces in binary or hex input?
Yes. Spaces are ignored, so grouped binary like 1010 1101 is accepted.
Is this converter private?
Yes. The conversion runs locally in your browser and does not need a database or paid API.