This free online hex calculator adds, subtracts, multiplies, and divides two hexadecimal numbers and shows the result in both hex and decimal. It also displays the decimal equivalent of each hex value as you type, which is handy for programming and debugging.
How to Use the Hex Calculator
Enter a hexadecimal value (0-9, A-F) in the "Hex Number 1" field; its decimal equivalent shows underneath.
Select an operation: addition (+), subtraction (−), multiplication (×), or division (÷).
Enter the second hex value in the "Hex Number 2" field.
Click "Calculate" to see the result in both hex and decimal, plus a remainder for division.
Frequently Asked Questions
It parses both hexadecimal strings into decimal numbers using base 16, performs the selected operation, then converts the result back to uppercase hexadecimal. For example, FF (255) + 1 (1) = 100 (256).
Only characters 0-9 and A-F (upper or lower case) are valid. Any other character, or an empty field, triggers "Invalid input! Please enter valid hexadecimal numbers (0-9, A-F)."
Division by zero is not allowed, so if Hex Number 2 evaluates to 0 the calculator shows "Invalid input! Division by zero is not allowed." instead of a result.
Yes, it's completely free with no sign-up required.