Contact

A person reads these. Corrections to the math are especially welcome, because the site is only useful if the numbers are right.

Email us

Pick whichever fits. They all reach the same inbox, but the labels help us triage.

General questions & feedback [email protected]
Corrections to our math or advice [email protected]
Partnerships, affiliates, press [email protected]
Privacy & data requests [email protected]

Replies within 2–3 business days. If you're writing about a calculator result, paste the link from its Copy link button; it carries your exact inputs and saves a round trip.