Hex Reference
0x15 in Binary = 00010101
Hex 0x15 converts to binary 00010101. Decimal: 21. Octal: 25.
Quick Answer
Hex
15
Binary
00010101
Decimal
21
Octal
25
How to Convert 0x15 to Binary — Step by Step
1
Separate the two hex digits
0x15 = high nibble 1 + low nibble 5
2
Convert each digit to 4 binary bits
Hex 1 = 0001 (decimal 1)
Hex 5 = 0101 (decimal 5)
3
Concatenate the 4-bit groups
0001 + 0101 = 00010101
0x15 in All Number Systems
| Hex (Base 16) | 15 (0x15) |
| Binary (Base 2) | 00010101 (0001 0101) |
| Decimal (Base 10) | 21 |
| Octal (Base 8) | 25 |
| ASCII | NAK |
Convert Any Hex Value Instantly
Use the full converter with step-by-step math, ASCII table, and two's complement support.
Open Full Hex to Binary ConverterExplore Other Popular Converters
Binary to Decimal Binary to Hex Binary to Octal Binary to ASCII Negative Binary to Decimal Decimal to Binary Decimal to Hex Decimal to Octal Hex to Binary Hex to Decimal Hex to Octal Hex to ASCII Octal to Binary Octal to Decimal Octal to Hex ASCII to Binary ASCII to Hex ASCII to Decimal Binary Cheat Sheets