Terms of Use

Last updated: October 2026

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

Use of the site

You may use the calculators and articles for personal and commercial purposes. You may not copy the site at scale, attempt to disrupt it, or use automated tools in a way that harms its performance.

No professional advice

Results are estimates for general information. They are not legal, tax, financial, medical or construction advice. Always check important figures with the relevant authority or a qualified professional. See our disclaimer.

Accuracy

We work hard to keep formulas and data correct, but we do not guarantee that every result is error free or up to date. Fees, rates and rules can change without notice.

Intellectual property

The site design, text and code are owned by Opal Calculator unless stated otherwise. You may quote short excerpts with a link back to the source page.

Limitation of liability

To the extent allowed by law, Opal Calculator is not liable for losses arising from your use of, or reliance on, the site or its results.

Changes and contact

We may update these terms at any time. Questions? Write to info@opalcalculator.com.