Contact
No form, no ticket number, no chatbot. An email address.
Write to us
[…] — for a wrong result, a tool that will not load, a suggestion, a legal or privacy request, or anything else.
Reporting a wrong calculation
This is the most useful message you can send, and the correction policy says exactly what to put in it: which tool, the values you entered, the result you got, the result you expected, and the source that says so. With those five lines a fix takes minutes; without them it may take nothing at all, because the problem cannot be reproduced.
What will not get a reply
Link exchange offers, guest post proposals, SEO services and unsolicited commercial approaches. Saying so here is more useful than a filter, because it saves you writing the message.