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Hexadecimal to Decimal Converter
Enter a hexadecimal number to convert it to decimal immediately. Paste multiple values (one per line) for bulk conversion. Arbitrary-precision math means even 128-bit values convert exactly.
Hexadecimal to Decimal Converter
How to convert hexadecimal to decimal
Hexadecimal (base 16) uses 0–9 and A–F; each hex digit maps to exactly four bits, so one byte is always two hex digits (00–FF). Decimal (base 10) is the everyday number system, using digits 0–9.
Worked example converting D6:
- Expand by place value:
13×161 + 6×160= 214 in decimal. - Result:
D6(hexadecimal) =214(decimal).
Accepted input formats
- Optional prefixes:
0b(binary),0o(octal),0x(hex). - Spaces, commas and underscores are ignored, so
1101_0110works. - A leading minus sign converts negative values (sign-magnitude, not two's complement).
- Hexadecimal is case-insensitive; output is upper-case.
Hexadecimal to Decimal reference table
| Hexadecimal | Decimal |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 5 |
| 6 | 6 |
| 7 | 7 |
| 8 | 8 |
| 9 | 9 |
| A | 10 |
| B | 11 |
| C | 12 |
| D | 13 |
| E | 14 |
| F | 15 |
| 10 | 16 |
| 20 | 32 |
| 40 | 64 |
| 64 | 100 |
| 80 | 128 |
| FF | 255 |
| 100 | 256 |
| 400 | 1024 |
| 1000 | 4096 |
| FFFF | 65535 |
Frequently asked questions
What is D6 in decimal?
D6 in hexadecimal equals 214 in decimal.
Is there a size limit?
No practical limit. The converter uses JavaScript BigInt, so values with hundreds of digits convert exactly without rounding.
Is my data sent to a server?
No. The conversion runs entirely in your browser; nothing you type is uploaded.