Terms of Use

Using the tools

You may use the calculator pages without an account. You are responsible for choosing inputs, checking units, understanding the stated methodology and deciding whether a result is appropriate for your purpose.

Estimates and availability

The tools are provided for general information and comparison. We aim to make the arithmetic clear, but do not warrant that a calculator covers every legal, medical, commercial or technical circumstance. Availability, browser support and results may change as defects are corrected.

Professional decisions

Do not treat a result as a diagnosis, investment recommendation, binding tax calculation, credit offer or engineering approval. Confirm significant decisions with suitable official information or qualified professionals. Rights and remedies that cannot lawfully be excluded remain unaffected.

Acceptable use

Do not attempt to compromise the site, misrepresent its results, interfere with access or use it to facilitate unlawful activity. References to other organizations or programs do not imply endorsement or affiliation.

Content and updates

Page content and calculator implementations may be updated to improve clarity or correctness. Saved browser preferences are convenience features and may be lost if site data is cleared. Keep your own records if you need a durable calculation history.