Terms of use

Effective date: October 5, 2026

Last reviewed: October 5, 2026

These terms govern your use of Numerandi, operated by Numerandi / Chris Mitchell. By using the site, you agree to these terms. If you do not agree, do not use the site.

Informational tools

Numerandi provides small calculators and related explanations for general informational purposes. Results depend on the values you enter and the assumptions described on each tool page. They are not financial, legal, medical, tax, engineering, or other professional advice. Verify important results independently and consult a qualified professional when appropriate.

Your use of the site

You may use Numerandi for lawful personal or business purposes. You must not interfere with the site's operation, attempt to bypass its security, use automated requests in a way that degrades service for others, or misrepresent Numerandi content as professional advice.

Availability and accuracy

Numerandi aims to provide clear formulas and accurate working, but calculator outputs are estimates, not guarantees. Tax rules, filing status, income, credits, timing, and later guidance can change what you owe. Features may also change or be withdrawn.

Tax decisions and limitation of liability

Numerandi does not guarantee that a result is accurate or fit for preparing a return or deciding what to pay. Before filing a return or making a tax payment, verify the result against current IRS forms and instructions or with a qualified tax professional.

You are responsible for decisions made using the site. To the extent permitted by law, Numerandi / Chris Mitchell is not liable for losses, penalties, interest, missed deadlines, or other costs arising from reliance on calculator output. Nothing in these terms excludes liability that cannot legally be excluded.

Intellectual property and advertising

The Numerandi name, site design, original explanations, and source material are protected by applicable intellectual-property laws. Third-party names remain the property of their owners. Numerandi uses Google AdSense, and ads may be shown on the site. An advertisement does not constitute Numerandi's endorsement of the advertiser. Theprivacy policy explains how advertising cookies work.

Changes

These terms may be updated as Numerandi evolves. The effective date above will change when revised terms are published. Continued use after an update means you accept the revised terms.