Large-number precision
Uses BigInt for exact whole-number conversion.
Enter a base-16 whole number using digits 0–9 and A–F to calculate its exact decimal value, binary equivalent, and significant hexadecimal length.
Decimal value = Σ(hex digit value × 16^position), with A through F representing 10 through 15.
Uses BigInt for exact whole-number conversion.
Supports 0x, letter case, signs and grouping separators.
Shows the corresponding base-2 representation.
Hexadecimal is a base-16 system. It uses decimal digits 0 through 9 plus A, B, C, D, E and F for values 10 through 15. Each position is a power of 16. For example, 2F equals 2 × 16 + 15, or 47 decimal. The same value is 101111 in binary.
The converter accepts uppercase or lowercase letters, an optional 0x prefix, a leading minus sign, and spaces or underscores for grouping. After cleaning the input, it rejects any character outside 0–9 and A–F. BigInt conversion keeps large hexadecimal integers exact.
One hexadecimal digit maps neatly to four binary bits, which makes hex convenient for addresses, colors, masks, encoded bytes and debugging. The significant binary length can be less than four times the hex digit count when the first hexadecimal digit begins with binary zeros.
| Input | What it means | Planning note |
|---|---|---|
| A | 10 decimal | A represents the decimal value 10. |
| 10 | 16 decimal | The first two-digit power boundary in hex. |
| FF | 255 decimal | 15 × 16 + 15. |
| 100 | 256 decimal | A 1 followed by two hex zeros is 16^2. |
Interpret hexadecimal logs, identifiers and memory-related values.
Understand numeric portions of colors and encoded data.
Translate compact hex values into decimal and binary.
They represent decimal values 10, 11, 12, 13, 14 and 15.
Yes. A leading 0x or 0X is removed before validation.
No. Uppercase and lowercase A through F have the same numeric values.
No. This page handles signed whole-number integers only.
Last reviewed: August 15, 2026. Integer conversions use browser BigInt for exact whole-number results.
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