Permitted use
You may use the site for lawful personal, educational, and business calculations. Do not interfere with the service, automate abusive traffic, or misrepresent our content as professional certification.
No professional relationship
Use does not create a medical, nutritional, engineering, legal, tax, or other professional relationship. Verify important results with a qualified person and applicable official guidance.
Availability and accuracy
We work to keep formulas and explanations accurate but do not promise uninterrupted availability or suitability for a particular purpose. Inputs, local rules, and rounding can change a real-world outcome.
Liability
To the extent permitted by law, Free Online Calc is not liable for losses arising from reliance on an estimate or inability to access the service.
Changes
We may update tools and these terms. Continued use after an update means the current terms apply.