Hexadecimal (base 16) uses digits 0—9 and letters A—F. Each hex digit represents 4 binary bits. It is widely used in programming, color codes (#FF5733), and memory addresses.

How do I convert hex to decimal?

Type your hex value (e.g. FF) in the Hex field. The decimal equivalent (255) appears instantly. The calculator also shows binary and octal equivalents.

Can I convert in any direction?

Yes. Enter a value in any of the four fields (Hex, Decimal, Binary, Octal) and all other fields update automatically.

Why does it show a color preview?

When you enter a 3 or 6-character hex value in the Hex field, it may represent an HTML color code. The tool shows a color preview when this is detected.

Does this handle negative numbers?

The current tool handles non-negative integers. For two's complement negative hex values, the decimal equivalent of the unsigned representation is shown.

How do I convert hex FF to decimal?

F = 15 in decimal. FF = 15×16 + 15 = 255. Or just type FF in the Hex field and the decimal 255 appears instantly.

What is 0x in front of hex numbers?

The 0x prefix is a programming convention to indicate a hexadecimal literal (used in C, C++, Java, Python, JavaScript, etc.). The tool shows prefixes (0x for hex, 0b for binary, 0o for octal) next to results.

Hex to Decimal Converter — HEX Decimal Binary Octal Converter Free

Convert hexadecimal to decimal, binary, and octal instantly. Enter any value in any base and all update in real time. Color preview for hex values.

Enter a value in any base — all fields update instantly.

Hexadecimal (Base 16)

Decimal (Base 10)

255

Binary (Base 2)

0b11111111

Octal (Base 8)

0o377

Binary breakdown (8 bits)

11111111

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What is Hex to Decimal Converter — Convert HEX, Decimal, Binary, Octal?

A hex to decimal converter translates between different number bases: hexadecimal (base 16), decimal (base 10), binary (base 2), and octal (base 8). Hexadecimal is widely used in programming, color codes (e.g. #FF5733), memory addresses, and low-level computing. Our converter lets you enter a value in any base and all other fields update instantly.

How to Use Hex to Decimal Converter — Convert HEX, Decimal, Binary, Octal

1Click the field for the number system you want to enter (Hex, Decimal, Binary, or Octal).
2Type your value — all other fields update instantly.
3Copy any output value using the copy button next to each field.
4For hex values representing colors (3 or 6 characters), a color preview is shown automatically.

Key Features

Convert between Hex, Decimal, Binary, and Octal simultaneously
Enter a value in any base to update all others
Color preview for hex color codes (3 or 6 character values)
Binary bit breakdown visualization
One-click copy for each output

Benefits

Debug color codes in CSS and HTML
Understand memory addresses in hexadecimal
Convert between number bases for programming and CS coursework
Check binary representations of numbers

Why Use Irreva for Hex to Decimal Converter — Convert HEX, Decimal, Binary, Octal?

Debug color codes in CSS and HTML

Understand memory addresses in hexadecimal

Convert between number bases for programming and CS coursework

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Works on any device: desktop, tablet, or mobile.

Frequently Asked Questions

HEX vs RGB vs HSL Best developer tools

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