Free calculators with the working shown
CalcTools

Terms of Use

By using CalcTools you agree to these terms. If you do not agree, please do not use the site.

Use of the calculators

The calculators and guides are provided free of charge for general information. You may use them for personal and commercial purposes, but you are responsible for checking that a result fits your situation before relying on it.

No professional advice

Results are estimates based on the formulas and sources described on each page. They are not medical, financial, legal, engineering or other professional advice. See our disclaimer.

Accuracy

We check every calculator against worked examples and correct confirmed errors quickly, but we cannot guarantee that every result is complete, current or error-free.

Content

The text, design and code of this website belong to CalcTools. You may link to any page and quote short passages with a link back. Please do not copy whole pages or calculators.

Liability

To the extent permitted by law, we are not liable for any loss or damage arising from the use of this website or reliance on its results.

Changes

We may update these terms from time to time. Continued use of the site means you accept the current version. Questions: [email protected].