Hexadecimal (base-16) uses digits 0-9 and letters A-F (where A=10, B=11, C=12, D=13, E=14, F=15). Each hex digit represents 4 binary bits. It's widely used in programming, color codes, and memory addresses.

Hex Converter

Convert between hexadecimal, decimal, binary, and octal. Plus hex-color to RGB.

Number Conversion

Hex: Decimal: Binary: Octal:

Hex Color → RGB

Hex Color Code

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Hex Digit Reference

Hex	Dec	Binary	Hex	Dec	Binary
0	0	0000	8	8	1000
1	1	0001	9	9	1001
2	2	0010	A	10	1010
3	3	0011	B	11	1011
4	4	0100	C	12	1100
5	5	0101	D	13	1101
6	6	0110	E	14	1110
7	7	0111	F	15	1111

Why Hex?

One hex digit = exactly 4 bits. One byte (8 bits) = exactly 2 hex digits. This makes hex the perfect shorthand for binary data. The binary sequence 11111111 10101010 becomes FF AA in hex—shorter, easier to read, and directly translatable back.

Where You'll See Hex

CSS/HTML colors: #FF0000 is red, #00FF00 is green, #0000FF is blue. Shorthand: #F00 = #FF0000.

Memory addresses: 0x7FFF0001 is more readable than its 32-bit binary equivalent.

Unicode code points: U+1F600 (😀), U+0041 (A), U+4E2D (中).

MAC addresses: AA:BB:CC:DD:EE:FF—6 bytes in hex-pair notation.

Frequently Asked Questions

What is hexadecimal?

Base-16 numbering: digits 0-9 and A-F (A=10 through F=15). Each digit = 4 binary bits.

How do hex color codes work?

#RRGGBB—each pair is 0-255 in hex. #FF0000 = pure red. #FFFFFF = white.

Why is hex used in programming?

Compact binary representation. One byte = exactly 2 hex digits. Far more readable than raw binary.

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How to Use This Hex Converter

Enter a hexadecimal value to convert to decimal, binary, and octal — or enter any of those formats to convert to hex. Supports both integers and color codes.

Formula & How It Works

Hex uses base-16 (0-9, A-F). Convert to decimal: multiply each digit by 16^position. Hex FF = 15×16 + 15 = 255. Hex to binary: replace each hex digit with 4 binary digits.

Calculation Example

Hex FF = Decimal 255 = Binary 11111111. Hex 1A3 = 1×256 + 10×16 + 3 = 419 in decimal.

Expert Tips

Hex is compact for representing binary data — one hex digit = 4 bits. Common uses: color codes (#FF0000 = red), memory addresses, MAC addresses. Hex 0x prefix is programming convention.