Binary Calculator
Convert a decimal number to binary, octal, and hex.
Worth Knowing
This shows a decimal number simultaneously in binary (base 2), octal (base 8), and hexadecimal (base 16) — the three bases computing relies on. Binary is how machines actually store numbers as on/off bits, while hex is a compact human-friendly shorthand where each digit packs exactly four bits. Seeing the same value across all three makes the relationships obvious, such as why 255 is a natural boundary (it's eight bits all set, or FF in hex).
How to Use
- Enter Decimal number into the Binary Calculator above.
- Your result appears instantly as you type — there's no submit button or page reload.