Hex Calculator
Convert hexadecimal values and perform hex arithmetic operations.
This tool is for informational and educational purposes only. It is not a substitute for professional financial, medical, legal, or engineering advice. See Terms of Service.
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Enter hexadecimal values and choose an operation to see results instantly. Supports conversion and four arithmetic operations.
- Choose an operation. "Convert Only" converts a single hex value to decimal, binary, and octal. The four arithmetic modes operate on two hex values.
- Enter hex value(s). Type hexadecimal digits (0-9, A-F). The "0x" prefix is optional. When doing arithmetic, enter both A and B values.
- Read the result. The hex result is shown with its decimal equivalent and full details below.
About Hexadecimal
Hexadecimal (hex) is a base-16 number system using digits 0-9 and letters A-F. Each hex digit represents exactly 4 binary bits, making it a compact way to express binary data. Hex is widely used in programming for colors (e.g., #FF5733), memory addresses, and byte values.
Arithmetic in hex follows the same rules as decimal arithmetic, just with 16 as the base instead of 10. This calculator converts all inputs to decimal, performs the operation, then converts back to hex.
Frequently Asked Questions
How do I convert hex to decimal?
Multiply each hex digit by 16 raised to its position (right to left, starting at 0). For example, FF = 15x16 + 15x1 = 255. Select "Convert Only" in this calculator to do it automatically.
What do the letters A through F mean in hex?
In hexadecimal, A=10, B=11, C=12, D=13, E=14, and F=15. These letters extend the single-digit system beyond 9 to accommodate base 16.
Why is hex used for colors?
HTML/CSS colors use three bytes (red, green, blue), each ranging 0-255. Two hex digits perfectly represent one byte (00 to FF), so a color like #FF5733 compactly encodes red=255, green=87, blue=51.