Toolist

Contact

If you find a calculation error, we want to hear about it.

Reporting an error

Including these makes it much faster to check:

  • The address of the tool page
  • The values you entered
  • The result you got, and the result you expected
  • Your source for the expected result, if you have one

Suggesting a tool

Suggestions are welcome. The most useful ones describe a real situation you are currently working out by hand.

Email us at:lpcuong2106@gmail.com

Report a problemWrong result, out-of-date figures or a display bug? Send it from here. The page address and tool name are attached for you — just describe what is wrong.

Report a problem

The more specific the faster it gets fixed: what you entered, what you got, and what you expected.

What kind of problem?
0/2000

Only used to reply to you, nothing else.

Sent with your report

Page
/en/contact
Language
English

The values you typed into the tool are not sent. Besides what is listed below, the server records the browser type and uses your IP address to rate-limit submissions — the privacy policy has the detail.