Contact
We'd love to hear from you
Feedback, corrections, a formula we should add, partnerships, DMCA notices — everything lands in the same inbox. We read every message.
Why people write to us
Report an issue
A result looks wrong, a page is broken, or a formula needs correcting. Include the URL and your inputs.
Suggest a calculator
Tell us the calculation you need and the source formula you expect us to use.
Business inquiries
Partnerships, licensing, advertising and press enquiries.
General questions
Anything not covered on our FAQ or methodology pages.
Feedback
What works, what does not, and what would make a tool more useful.
Legal and DMCA
Privacy requests and copyright notices reach the same inbox.
What to expect
Response time
Usually within 2 business days. Reported calculation errors are prioritised and confirmed fixes are dated on the affected page.