Hex Calculator – Perform Hexadecimal Math Online
Add, subtract, multiply and divide hexadecimal numbers with decimal and binary views.
About the Hexadecimal Calculator
What is the Hexadecimal Calculator?
A hexadecimal calculator performs arithmetic on base-16 numbers and converts to decimal and binary.
Why use this calculator?
Hex is shorthand for bytes used in programming, colour codes and memory addresses. Doing the maths directly in hex saves conversions.
How to use it
- Enter two hexadecimal numbers (digits 0-9 and letters A-F).
- Choose the operation.
- Read the hex result with decimal and binary equivalents.
Formula
Standard base-16 arithmetic.
A leading 0x is optional. Same rules as decimal arithmetic, just a different base.
Frequently Asked Questions
Why is hex used in programming?
Every hex digit maps to exactly four binary bits, making it a compact human-readable view of byte data.
What is 0xFF?
0xFF is 255 in decimal — the maximum value of one byte, often seen in colour codes.
What order of operations does this use?
It follows standard PEMDAS/BODMAS rules: parentheses, exponents, multiplication and division, then addition and subtraction.
How precise are the answers?
The calculator uses double-precision floating-point math (about 15 significant digits) and rounds the display. For exact symbolic results use dedicated algebra software.
Can I enter negative numbers or decimals?
Yes. Negative values, decimals and very large or small numbers are all supported unless a field says otherwise.
What does it mean if I get an error?
Errors usually mean an invalid input, such as division by zero or a negative value where only positives make sense. Check your entries and try again.
Is this calculator free to use?
Yes. Every calculator on this site is completely free, with no hidden fees, no subscriptions and no limits on how many times you can use it.
How accurate are the results?
We use standard, widely accepted formulas and calculate in your browser using double-precision arithmetic. Results are rounded for readability, so treat them as reliable estimates rather than a guarantee. Real-world factors can vary the true figure.
Can I add this calculator to my own website?
Yes. Open this calculator page and use the "Add to your website" box in the sidebar to copy a ready-made iframe snippet, then paste it into any HTML page.
Does it work on a phone or tablet?
Yes. The layout is fully responsive, so it works on desktops, laptops, tablets and mobile phones, and every input adapts to touch screens.