Number Base Reference
| Base | Name | Digits | Used In |
|---|---|---|---|
| 2 | Binary | 0, 1 | Digital circuits, low-level programming |
| 8 | Octal | 0-7 | Unix file permissions |
| 10 | Decimal | 0-9 | Everyday numbers |
| 16 | Hexadecimal | 0-9, A-F | Colors, memory addresses, MAC addresses |
Hex to Decimal Converter
Convert between hexadecimal, decimal, binary, and octal number systems. Supports large numbers and negative values.
📐 How We Calculate — Learn about our calculation methodology, data sources, and quality standards.
Frequently Asked Questions
Why is hexadecimal used in computing?
Hex is compact — one hex digit represents exactly 4 bits. This makes it easy to read binary data. For example, 0xFF is much easier to read than 11111111.
How do I convert hex to decimal manually?
Multiply each hex digit by 16 raised to its position (right to left, starting from 0). For example: 1A = 1×16¹ + 10×16⁰ = 16 + 10 = 26.
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Open →How to Use This Hex to Decimal Converter
Enter a hexadecimal number (with or without 0x prefix). The calculator converts to decimal, binary, and octal.
Formula & How It Works
Each hex position n (from right, starting at 0) contributes: digit_value × 16^n. Sum all positions for the decimal result.
Calculation Example
Hex 2F = 2×16¹ + 15×16⁰ = 32 + 15 = 47. Hex BEEF = 11×4096 + 14×256 + 14×16 + 15 = 48,879.
Expert Tips
Remember: A=10, B=11, C=12, D=13, E=14, F=15. For quick conversion of 2-digit hex: first digit × 16 + second digit. Hex is essential for web development, networking, and low-level programming.