Contact

The fastest way to reach us is email:

hello@kdp.cool

We read everything — bug reports, feature requests, calculator suggestions, and corrections to the math or tax data are all welcome. Replies usually within a few days.

Found a bug?

Source code is on GitHub. Open an issue with the page URL, what you entered, what you expected, and what you got. Screenshots help.

Looking for a calculator we don't have?

Email or open a GitHub issue. We prioritize calculators that get high search volume and have authoritative source data we can cite.