Contact

Questions, corrections and calculator requests are all welcome.

Reporting a wrong result

Please include:

• The calculator name or tool number, for example ECT-S01.
• Your inputs. The “Copy link” button above each calculator puts them all in one link.
• The result you expected and where it came from (a textbook example, a hand calculation, another program).

Suggesting a calculator

Tell us the problem you are trying to solve and the formula or standard you use. Requests that come up often are built first.