Contact
CalcDelta is built and run by one independent developer — the calculators, the formula notes, the translations and every correction. There is no editorial team and no sponsored placement: the site is funded by the advertising Adsterra serves on the homepage and calculator pages.
hqzhon@gmail.com · We usually reply within 2–3 business days.
What to write about
Send a message if a result looks wrong, if a formula or a cited source does not match what the page says, if a translation reads badly in your language, or if a unit or edge case is handled incorrectly. Requests for a calculator that does not exist yet are welcome too. Business enquiries are answered, though this is a one-person project and not every proposal can be accepted.
How a correction is handled
Every report is reproduced before anything changes: the values you describe are run again, the cited source is re-checked, and the fix is applied to the data file that generates the page rather than patched into the HTML. When a correction changes a published result, the page's review date moves with the content version. If a report cannot be confirmed, you get an answer explaining why instead of a silent edit.
What this site cannot do
CalcDelta is not a medical, legal or financial adviser and does not give individual advice. Each calculator applies a published formula to the numbers you enter; deciding what those numbers mean stays with you, and with a qualified professional where it matters.