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What is helpful to include

Telling us which calculator you used, which values you typed and which part of the result looked wrong makes it much faster to check.

When a calculation looks wrong

If a result looks wrong, please send an email. Pointing to the part of the formula shown on the page that looked off makes it clear what to examine.

Email is the only channel

The site has no sign-up, no sign-in and no payment step, so there is no account or message board to reach us through.

That leaves the email address shown on this page as the only channel.

What you do not need to include

You do not need to include personal details such as your name or date of birth. Nothing on this site asks for them in order to run a calculator.

The values you typed into a calculator do not reach us on their own either, so include only as much as you want to write out.