Report a wrong result, suggest an improvement, or tell me what felt unclear.

If a formula looks off or a page is confusing, send the exact inputs and expected result. That is the fastest way to improve the site.

How to reach me

Use whichever channel is easiest. Email is usually the fastest for calculator issues because it is easiest to include the exact numbers.

Best option for bugs, formula questions, and UI issues.

GitHub

Useful if you want to point to a reproducible issue or track a fix publicly.

Fine for general outreach, suggestions, or collaboration questions.

A few concrete details save a lot of back-and-forth.

The exact calculator page and mode you used.

The input values you entered, including decimals.

The result you saw and what you expected instead.

Whether the issue happened on mobile or desktop.