Enter a binary number to convert it to decimal instantly. Handy for Class 11–12 computer science — see the side-by-side reference table below, or open the full converter for all four bases at once.
base 2 → base 10 · Open the full converter →
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A number written in binary (base 2) is rewritten in decimal (base 10). For example, 101010 in binary equals 42 in decimal. The full converter at /tools/ shows binary, octal, decimal and hexadecimal together.
| Binary | Decimal |
|---|---|
| 1 | 1 |
| 10 | 2 |
| 100 | 4 |
| 1000 | 8 |
| 1010 | 10 |
| 10000 | 16 |
| 101010 | 42 |
| 11111111 | 255 |
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