Terms of Service
Plain terms for a free calculator site — what you may do, and what we do not promise.
Using this site
You may use these calculators freely for personal, educational or commercial purposes. You do not need an account and there is no charge. By using the site you accept these terms.
What you may not do
Please do not attempt to disrupt the site, scrape it at a rate that degrades service for others, republish its pages wholesale as your own, or use it in any way that breaks the law where you are.
Accuracy
We work hard to make every calculator correct, and each one's maths is tested against known values. Even so, the results are provided without warranty of any kind. Formulas vary between institutions and jurisdictions; reference data changes; and a calculator cannot know the details of your particular situation. Always verify a result before relying on it for anything that matters.
Not professional advice
Nothing on this site is medical, financial, legal, tax or religious advice. The health calculators are general-population estimates. The finance calculators do not know your credit terms. The zakat calculators are a calculation aid, not a ruling. See the disclaimer for detail.
Limitation of liability
To the fullest extent permitted by law, we are not liable for any loss arising from your use of, or inability to use, this site — including decisions made on the basis of a calculated result.
Third-party links and advertising
Pages may link to external sites and display third-party advertising. We do not control that content and are not responsible for it.
Intellectual property
The design, written content and code of this site are ours. The mathematical formulas the calculators implement are, of course, not — they are public knowledge, and we make no claim over them.
Changes
These terms may change. The review date below shows when they were last updated.
This page was last reviewed on 11 August 2026.