Contact Plainsum

Email us at [email protected].

Reporting a mistake

If a result looks wrong, tell us which calculator you used, the numbers you entered, and what you expected to see. We check reports against the official source and fix confirmed errors as soon as we can. Corrections are noted in the page's "Last reviewed" date.

Suggesting a calculator

Tell us what you were trying to work out and which numbers you had. We read every suggestion and use them to decide which calculators to build next.

What we can't help with

We can't give personal financial, tax, legal, or medical advice, or review your own documents. For those, please talk with a qualified professional.

Advertising and privacy questions

For questions about ads or data, see our Privacy Policy or email the address above.