FAQs

Hex Calculator is a free set of hexadecimal calculators and conversion tools — base conversion, arithmetic, bitwise operations, and more — built on one shared, arbitrary-precision engine.

Yes, every tool on this site is free with no account required.

No. Every calculator runs entirely in your browser without a login.

Yes. Every calculation uses exact, arbitrary-precision arithmetic — no floating-point rounding. See the Methodology page for how each type of calculation works.

Signed interpretation and bitwise operations only make sense at a specific bit width — the same hex value reads as a different signed number at 8-bit versus 32-bit, so bit width is always explicit rather than assumed.

Contact us with the exact input, the tool page, and the output you expected — that's the fastest way for us to reproduce and fix it.

Multiply each hex digit by 16 raised to its position, counting from 0 on the right, then add the results. For example, FF = (15 x 16) + (15 x 1) = 255.

0x is a common prefix marking a value as hexadecimal rather than decimal.

Yes. Calculators on this site strip common prefixes (0x, #) and separators (spaces, underscores) automatically before validating the input.

No. Calculator input never leaves your browser — it's not sent to our servers, logged, or stored anywhere.

This site doesn't set its own tracking cookies. See the Privacy Policy for the current, up-to-date status of analytics and advertising.

No. Information you email us is used only to respond to you.

Use the Contact page — include the exact input, the page you were on, and what you expected.

This site is maintained by a small team, so replies aren't instant, but every message is read and answered.

Yes — every calculator will remain free to use.

Not currently. If ads are enabled in the future, the Privacy Policy and Disclaimer pages will be updated first to describe exactly how they work.