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BCD to Hex Converter
Convert validated 8421 BCD digits to hexadecimal online with exact BigInt arithmetic, strict nibble validation, case choices, and optional 0x output.
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Detailed conversion guide
How to Convert BCD to Hex
Validate and decode every 8421 BCD nibble as one decimal digit, combine the digits into an exact non-negative integer, then format that value in base 16.
BCD 0101 1001 represents decimal 59, not binary 0x59. Decimal 59 becomes hexadecimal 3B. This distinction prevents the common packed-digit misreading.
| Input | Output | Meaning |
|---|---|---|
0000 | 0 | decimal 0 |
0001 | 1 | decimal 1 |
0001 0000 | A | decimal 10 |
0101 1001 | 3B | decimal 59 |
BCD to Hex without Treating BCD as Binary
The algorithm validates the representation before exact integer conversion, so malformed input never produces a plausible partial answer.
const decimal = groups.map(g => parseInt(g, 2)).join('');
const hex = BigInt(decimal).toString(16).toUpperCase();BCD Is Not a Hex Byte String
BCD nibbles 1010-1111 are invalid and are rejected. Incomplete nibbles, signs, decimal points, and alternate signed BCD formats are unsupported.
Leading BCD zeros do not affect the numeric hex value. Uppercase, lowercase, and 0x prefix are display options for the same integer.
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