Wrong result, missing calculator, broken page, or a question about a source — all of it comes here.
Reporting a wrong result
This is the message we most want to receive. Please include:
- Which calculator, and the exact values you entered.
- What it gave you, and what you expected instead.
- Where your expected answer comes from, if you have a source.
With those three things we can usually reproduce the problem in minutes. Without the numbers, we often cannot reproduce it at all.
Suggesting a calculator
Tell us what you need to work out and, if you know it, where the formula is published. A calculator with a citable source moves to the top of the list; one without a readable source will not be built, however popular it is.
Everything else
Press, corrections, licensing, privacy requests and complaints all reach the same place.
We read every message. We reply to the ones that need a reply, usually within a few days.