What this conversion means in practice
You already have values in Hexadecimal (hex) and need Decimal (decimal) for the same material, drawing, or dataset. The factor below is the exact reciprocal of the forward direction; use it when sources quote the “other” unit first.
Hex is compact for bytes and addresses; decimal is easier for mental magnitude. Converting hex strings to decimal answers “how big is this color/component ID really?”
Letters A–F continue the digit sequence after nine; validation rejects out-of-range symbols before conversion.
Case does not matter: mixed A–F and a–f work the same.
Mnemonic: FF₁₆ = 255₁₀; DEAD₁₆ → decimal via expand-and-sum.
How to convert hexadecimal to decimal
Treat your input strictly as a base-16 integer: only digits valid for that base are allowed. The tool converts to an exact integer, then prints it in base 10.
Live example: …16 → …10
Unlike unit conversions with a single scale factor, radix conversion rebuilds the digit sequence. The “expand to decimal, then divide out the target base” algorithm matches what you learn in CS, automated here for any size.
Hexadecimal
Definition: Base 16: digits 0–9 plus A–F for ten through fifteen. One hex digit represents exactly four bits.
History and origin: Adopted widely in computing to shorten binary strings while preserving bit alignment.
Current use: Memory addresses, RGB colors (#RRGGBB), UUIDs, hashes, and debug output.
Decimal
Definition: Base 10: the everyday positional system using digits 0–9.
History and origin: Linked to counting on ten fingers; dominant globally for human-facing arithmetic.
Current use: General arithmetic, finance, and human-readable magnitudes before re-encoding to other bases.
Hexadecimal to Decimal conversion table
| Hexadecimal (base 16) | Decimal (base 10) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| A | 10 |
| FF | 255 |
| 2A | 42 |
| 100 | 256 |
| FFF | 4095 |
| DEAD | 57005 |
Hexadecimal to Decimal FAQ
Quick answers for Hexadecimal-to-Decimal rounding (reverse workflow), precision, and common mistakes.
Is hex case-sensitive?
No for input; output uses uppercase by convention.
Do I include 0x?
Strip language prefixes; enter only hex digits.
How is this different from the hex calculator?
This page only changes radix; the hex calculator does arithmetic in hex.