Terms of use

Effective October 25, 2026.

Educational purpose

This calculator and its guides are provided for general educational and informational use. Check results against the original problem and any relevant professional requirements. Do not rely on this tool alone for safety-critical, financial, medical or engineering decisions.

Accuracy and availability

We aim to make the arithmetic and explanations accurate, but software and content can contain errors. The service is supplied as available, without a guarantee of uninterrupted access or suitability for every task. Nothing here limits rights that cannot legally be excluded.

Using the material

You may use the calculator, print worked examples for personal study or classroom teaching, and link to our pages. Do not republish substantial site content as your own, impersonate the site, or interfere with its operation.

Assignments and assessments

Follow the rules set by your teacher or institution. A calculator result does not demonstrate that you understand the method; the steps and practice are here to help you learn it.

Questions

Contact us about errors or these terms. Read the privacy policy for information about data handling.