What Does 01001001 Mean in Binary?
01001001 is the capital letter I in ASCII and UTF-8. In decimal it is 73, and in hex 49.
- Character
- I
- Decimal
- 73
- Hex
- 49
01001001 step by step
Each 1 switches on its place value. Add the place values of the 1s to get the ASCII code.
| Bit | Place value | Value |
|---|---|---|
| 0 | 2to the power of 7 = 128 | 0 |
| 1 | 2to the power of 6 = 64 | 64 |
| 0 | 2to the power of 5 = 32 | 0 |
| 0 | 2to the power of 4 = 16 | 0 |
| 1 | 2to the power of 3 = 8 | 8 |
| 0 | 2to the power of 2 = 4 | 0 |
| 0 | 2to the power of 1 = 2 | 0 |
| 1 | 2to the power of 0 = 1 | 1 |
64 + 8 + 1 = 73
Decode more binary
The converter starts with 01001001. Add more bytes to decode a whole message.
Binary to text
| Binary | Dec | Hex | Char |
|---|---|---|---|
| 01001001 | 73 | 49 | I |
Uppercase and lowercase
The lowercase i is 01101001, which is 105: 32 more than I. Only the third bit from the left changes.
Frequently asked questions
What letter is 01001001 in binary?
01001001 is the capital letter I. Its place values add up to 73, and 73 is I in the ASCII table.
What is 01001001 in decimal and hex?
01001001 is 73 in decimal and 49 in hex. The first four bits, 0100, make the hex digit 4, and the last four, 1001, make 9.
Is 01001001 the same in ASCII and UTF-8?
Yes. UTF-8 keeps every ASCII code from 0 to 127 as a single byte, so 01001001 is I in both.