Get in touch
To report a bug in one of the calculators, suggest a new tool, ask about the privacy policy, or anything else related to the site, the direct channel is this email address:
What's useful to include
When reporting a bug, it helps to mention which tool was in use, what values were entered, and what result was expected instead of what actually showed up. For a new tool suggestion, describing the use case is enough — no need to spell out the implementation.
Corrections to the guides
The guides include worked examples, reference tables, and citations of RFCs and other specifications. If a calculation, figure, or reference is wrong — or has gone stale because a standard changed — please point out the guide, the section, and the source that contradicts it. Corrections are checked against the original specification and, where warranted, published along with an updated date on the article.