Binary to Decimal Converter
Type a binary number to see it in decimal. Below: how the conversion works, a worked example and a conversion table.
11111111 binary = 255 decimal
How to convert binary to decimal
Multiply each digit by 2 raised to the power of its position (counting from 0 on the right) and add the results.
Example: 11111111 to decimal
Binary to decimal
Multiply each digit by 2 to the power of its position (0 on the right), then add:
| Digit | Place value | Digit × place |
|---|---|---|
1 | 27 = 128 | 128 |
1 | 26 = 64 | 64 |
1 | 25 = 32 | 32 |
1 | 24 = 16 | 16 |
1 | 23 = 8 | 8 |
1 | 22 = 4 | 4 |
1 | 21 = 2 | 2 |
1 | 20 = 1 | 1 |
128 + 64 + 32 + 16 + 8 + 4 + 2 + 1 = 255
Binary to Decimal table
Binary to other systems
Other systems to decimal
Reverse conversion
Frequently asked questions
How do you convert binary to decimal?
Multiply each digit by 2 raised to the power of its position (counting from 0 on the right) and add the results.
What is 11111111 in decimal?
11111111 in binary is 255 in decimal.