Hexadecimal (base-16) is a number system that uses 16 symbols: the digits 0–9 and the letters A–F. It is widely used in computing because one hex digit maps to exactly 4 binary bits, making binary data far more compact and readable.

Are hex letters case-sensitive?

No. Hexadecimal digits are case-insensitive, so "1a" and "1A" represent the same value. This converter accepts both uppercase and lowercase input freely.

Can I convert negative hex values?

Yes. Prefix the hex value with a minus sign (e.g. -FF) and the tool will convert the absolute value and prepend the minus to all results. Two's complement is not assumed — the mathematical sign convention is used.

What is the largest hex value supported?

The tool uses JavaScript's BigInt, so there is no practical upper limit. It handles hex values of arbitrary length with full precision, well beyond 64-bit integer constraints.

How do I convert hex to decimal by hand?

Multiply each digit by 16 raised to its position power (right to left starting at 0), then sum the products. For example, "1F" = 1×16¹ + 15×16⁰ = 16 + 15 = 31.

What characters are valid in a hexadecimal number?

Valid hex digits are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, and F (or their lowercase equivalents). An optional leading minus sign is allowed for negative values. The "0x" prefix is stripped automatically.

Hexadecimal to Decimal Converter

Name: Hexadecimal to Decimal Converter
Availability: InStock
Author: Nham Vu

Enter any hexadecimal value and instantly see its decimal equivalent, plus binary and octal representations.

Hexadecimal Input

Enter a hexadecimal value (0–9, A–F)

Quick examples

Hex digit values

Conversion Results

Decimal (base 10)

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Binary (base 2)

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Octal (base 8)

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Hexadecimal (base 16)

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Summary

Enter any hexadecimal value and instantly see its decimal equivalent, plus binary and octal representations.

How it works

Type a hexadecimal value into the input field using digits 0–9 and letters A–F.
The decimal result updates in real time as you type.
Binary and octal equivalents are shown below the main result.
Use a Copy button to copy any result to your clipboard.
Click a quick example to load a sample value instantly.

Use cases

Decode memory addresses and register values from hex to readable decimal.
Convert CSS color hex codes to their decimal RGB channel values.
Translate hex error codes from system logs into decimal for documentation.
Verify number base conversions during computer science coursework.
Read hardware datasheets that list register offsets in hexadecimal.
Debug embedded systems where values are displayed in hex.
Convert hex timestamps or protocol fields to decimal for analysis.
Cross-check results from manual hex-to-decimal long division.

Frequently Asked Questions

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Last updated: 2026-05-23 · Reviewed by Nham Vu