Use the form below to ask a question about proportions, report a problem with the calculator, or suggest a topic for a future guide. Every message goes to the site owner, and any reply goes to the email address you enter in the form.
Send a Message
What Happens Next
After you send the form, you will see a confirmation message on this page. Messages are read in the order they arrive. If you are asking about a calculation, please include the exact numbers from your problem so the answer can be checked against the same setup.
Before You Write
- Try the steps shown by the calculator first. Most homework questions are answered by the cross-multiplication steps on the home page.
- No account is needed to use the calculator or to send a message.
- Do not include passwords or other private account details in your message.