Contact

Found a wrong number? Have an idea for a new calculator? We read everything.

What to include

• Data corrections — the tool page, the value you believe is wrong, and your source (screenshot or clip helps). These get fixed fastest.
• Tool requests — what should the calculator do, and what decision would it help you make?
• Business / advertising — use the same address with "Business" in the subject line.

We're a small independent project, so replies can take a couple of days — data fixes usually ship faster than replies. 😄