Contact
Found a calculation that looks wrong, a source that needs updating, or a calculator you wish existed? Email us directly:
When reporting a calculation error
Please include, if you can:
- Which calculator, and a link to the page.
- The exact inputs you entered.
- The result you got, and what you expected instead (and why, if you have a source).
This gets a fix into the calculator faster than a general "this seems off" — see our Editorial Standards for how corrections are handled.
Response time
This is a small, independently run site — expect a reply within a few business days, faster for calculation errors than for feature requests.