Hex Calculator

Convert between hexadecimal, decimal, binary, and octal. Perform arithmetic on hex numbers.

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Value

From Base

First Hex Number

Operation

Second Hex Number

Hexadecimal

Decimal

Binary

Octal

ASCII Char

Convert hexadecimal values to and from decimal, binary, and octal, run basic arithmetic and bitwise operations on hex numbers, and preview hex color codes.

How It Works

How Hex Calculator Works

The converter reads your input using whichever base you've selected, parses it into a plain decimal integer, and then re-expresses that same value in hex, binary, and octal — plus, if the decimal value falls in the printable ASCII range (32–126), it shows the corresponding text character.

Arithmetic mode parses both numbers you enter as base-16 integers and applies your chosen operator — either plain arithmetic (+, −, ×, ÷) or a bitwise operation (AND, OR, XOR) — then redisplays the result back in hexadecimal, along with its decimal, binary, and octal equivalents.

When the hex value being converted is exactly 3 or 6 digits long, the calculator also renders it as a color swatch, since those are the two standard lengths for web CSS colors: #RGB (3 digits) and #RRGGBB (6 digits).

Worked Example

See It In Action

Converting hex 41 gives decimal 65 — and because 65 falls within the printable ASCII range, the ASCII Char field shows the letter 'A'. The same value is 1000001 in binary and 101 in octal.

Real-World Use Cases

Who Uses Hex Calculator and Why

Looking up or previewing a CSS color code from its hex value during web development.
Converting a memory address or debugger output between hex, binary, and decimal.
Decoding an ASCII character from a hex value using the built-in character lookup.
Running a bitwise AND, OR, or XOR operation directly on two hexadecimal numbers.

Common Mistakes

Mistakes to Avoid

Expecting a color swatch to appear for a hex value that isn't exactly 3 or 6 digits long — those are the only two lengths that match the standard #RGB and #RRGGBB CSS formats.
Expecting an ASCII character to display for a decimal value outside the printable range of 32–126 — the field only fills in within that range.
Confusing this tool's hex-first arithmetic and bitwise operations with plain decimal math, forgetting the entered numbers are parsed as base-16.

Pro Tips

Tips for Best Results

Use the ASCII Char field as a fast way to decode what character a given hex or decimal byte value represents.
If you need a color preview, double check your hex string is exactly 3 or 6 digits — anything else won't trigger the swatch.

Troubleshooting

Fixing Common Problems

No color swatch is showing for my hex value. — Color previews only appear for hex values exactly 3 or 6 digits long, matching the standard #RGB or #RRGGBB CSS formats — any other length won't render a swatch.

Glossary

Terms Explained

ASCII: A standard character encoding that maps numeric values (32–126 for printable characters) to letters, digits, and symbols.

RGB hex code: A 3- or 6-digit hexadecimal color format (like #F00 or #FF0000) used throughout CSS and design tools.

FAQ

Frequently Asked Questions

Why does hex 41 correspond to the letter 'A'?

The ASCII character encoding standard assigns the number 65 to the uppercase letter 'A', and 41 in hexadecimal equals 65 in decimal (4×16 + 1 = 65), so the two representations point to the same character.

When does the calculator show a color preview?

Only when the value you convert is exactly 3 or 6 hexadecimal digits long, matching the standard #RGB or #RRGGBB formats used for colors in CSS and design tools.

Can I perform bitwise AND, OR, or XOR on hex numbers?

Yes — the arithmetic mode supports bitwise operators alongside standard arithmetic; internally the hex values are parsed as base-16 integers and the bitwise logic is applied the same way it would be on binary numbers.

How is this different from the Binary Calculator?

Both tools convert between the same number systems, but this one is built around a hex-first workflow with added features specific to hex use cases, like ASCII character lookup and CSS color-code previewing.