Contact Us

We read every message. Write to us for questions, feedback, partnership requests or to report a wrong answer. We usually reply within a few working days.

Reporting a wrong answer

To help us fix it quickly, please include:

• the exact problem you entered, copied from the input box;
• the page you used (the main solver or a specific calculator);
• the answer you expected and, if you know it, why.

A screenshot of the result is helpful too. Every confirmed report becomes a test case, so the same mistake cannot come back.

Suggesting a feature

Tell us which topic or calculator you need and what grade or course it is for. Requests from students and teachers decide what we build next.

Before you write

Many questions about input format are answered in the FAQ on each calculator page and on the home page. Our guides explain common methods step by step.