Binary to Decimal Converter
Turn a binary number into decimal.
Quick answer: Type a binary number to get decimal. For example 1010 is 10, 11111111 is 255 and 10000000 is 128.
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How to use it
- Type your number. Hex may use the letters A to F.
- Choose the base it is written in and the base you want.
- The answer appears in large type, with all four bases shown below.
Quick reference
| Decimal | Binary | Octal | Hex |
|---|---|---|---|
| 1 | 1 | 1 | 1 |
| 2 | 10 | 2 | 2 |
| 8 | 1000 | 10 | 8 |
| 10 | 1010 | 12 | A |
| 15 | 1111 | 17 | F |
| 16 | 10000 | 20 | 10 |
| 32 | 100000 | 40 | 20 |
| 64 | 1000000 | 100 | 40 |
| 100 | 1100100 | 144 | 64 |
| 128 | 10000000 | 200 | 80 |
| 255 | 11111111 | 377 | FF |
| 256 | 100000000 | 400 | 100 |
| 1000 | 1111101000 | 1750 | 3E8 |
| 1024 | 10000000000 | 2000 | 400 |
What people use it for
- Homework and school projects
- Quick checks without a calculator
- Puzzles and games
- Learning how codes work
Questions
What is 255 in binary?
255 is 11111111.
What is FF in decimal?
FF is 255.
What digits does hexadecimal use?
0 to 9 and A to F, where A is 10 and F is 15.
How large a number can it convert?
Whole numbers of any size.
Is it free?
Yes. No sign-up, no install and no limit.
Is anything saved or sent?
No. Everything runs in your browser. Only your own best score, where a page shows one, is kept on your device.
Last updated 2026-10-24. Free to use, no sign-up. Made by ficklestudio26.