Numeros is an independent website maintained by one person. These terms explain how you may use our calculators, generators, guides and other tools. By using the site, you agree to these terms. Read them together with our Privacy Policy and Disclaimer.
Free access and site support
All Numeros calculators and tools are free to use. You do not need a Numeros account or subscription. Google AdSense advertising and affiliate commissions help cover the costs of running, maintaining and developing the site, and support the work behind it. You do not need to click an advertisement or make a purchase to use a tool.
Some optional features may require an external provider's API key or account. External providers may impose their own limits, charges or terms. Free access does not guarantee unlimited requests, uninterrupted availability or permanent availability of a particular feature.
Using tools and interpreting results
You may use the tools for personal, educational or professional reference. Enter accurate information, select the appropriate units and settings, and review the method, assumptions, examples and limitations on the relevant page.
Results depend on the selected method, your inputs and, for some tools, external data. Some tools use mathematical formulas; others use reference tables, public lookups, estimates or heuristic methods. Rounding, data age and differences between methods can affect results. See our Methodology for our approach.
Not professional advice
The site provides information and computational assistance, not personalized financial, investment, tax, medical, legal, engineering or religious advice. A calculator cannot assess all circumstances that may apply to you. Verify important results independently and consult an appropriately qualified professional where needed before acting on them.
In particular, a Zakat estimate does not confirm religious eligibility, the passage of a lunar year or the appropriate treatment of every asset or debt. Health results do not provide a diagnosis, and financial or tax results do not guarantee an outcome or determine your legal obligations.
Accuracy, corrections and availability
We aim to explain methods clearly and correct reported errors. We do not guarantee that every result, example, rate or reference is error-free, complete or current. Report a suspected issue through our Contact page, identifying the tool, settings and steps needed to reproduce it without sending sensitive information.
Tools may be changed, temporarily unavailable or discontinued. Many calculations work locally after loading, but live prices, rules, lookups and other external features need a connection. Provider outages and request limits can affect their operation.
Your information and external services
Some tools process values locally; others send specific requests or entered information to external services. Some features save drafts, preferences or optional API keys in your browser. Review each tool's notice and our Privacy Policy before entering confidential information. You are responsible for protecting your own API keys and clearing private drafts on shared devices.
Links to an organization or source do not imply affiliation, approval or endorsement. External websites and services have their own terms and privacy practices. We do not control their content, availability, records or responses.
Advertising and affiliate links
Some links are affiliate referrals. If you follow an eligible referral and take a qualifying action, Numeros may receive a commission. Using these links is optional and does not change a calculator's mathematical result. Any purchase or account agreement is between you and the relevant provider; review its pricing, conditions and policies before proceeding.
Advertising and referral tracking are described in our Privacy Policy. An advertisement, referral or listing is not a guarantee that a product is suitable for your circumstances.
Acceptable use
- Do not use tools or generated outputs for unlawful activities.
- Do not attempt unauthorized access, interfere with the site, overload services or bypass security controls or request limits.
- Do not submit malicious code or misuse contact and lookup features.
- Do not copy or systematically extract protected site content for unauthorized republication.
We may restrict access to address abuse, security issues or violations of these terms. Where required by law, applicable notice and other protections remain available.
Original content and generated outputs
Unless otherwise identified, Numeros owns its original written content, design and calculator implementations, subject to third-party rights and applicable licenses. Mathematical formulas, public facts and third-party materials do not become our property merely because we reference them.
You may link to our pages and use calculation results or generated outputs for lawful purposes. This permission does not transfer ownership of the site's code or written guides, grant rights in third-party materials, or guarantee that an output is unique or suitable for every use. Reproduction of protected content remains subject to permission, applicable licenses and exceptions provided by law.
Age and capacity
Numeros is intended for a general audience and is not directed at children under 13. You must be at least 13 to use the site independently. If you are not old enough under applicable law to agree to these terms yourself, use the site with a parent or guardian's involvement.
Warranties and liability
To the extent permitted by applicable law, the site and tools are provided "as is" and "as available," without warranties of accuracy, uninterrupted operation or fitness for a particular purpose.
To the extent permitted by applicable law, Numeros and its operator are not liable for indirect, incidental, special or consequential losses arising from use of, or inability to use, the site. Nothing in these terms excludes liability or limits consumer rights that cannot lawfully be excluded or limited.
Changes and applicable rights
We may update these terms as the site or its services change. The page's update date identifies the revision. Review the current terms when using the site. Any notice, consent or other procedure required by applicable law still applies.
If a provision is unenforceable, the remaining provisions continue to apply to the extent permitted by law. These terms should be read with the Privacy Policy and Disclaimer; none of these pages overrides rights that applicable law protects.
If you have a concern or dispute, contact us first so we can try to resolve it. Applicable law determines the rights, remedies and competent forum available; these terms do not remove mandatory protections.
Contact and related information
For questions about these terms, use our Contact page. Learn more through About Numeros, our Methodology, Privacy Policy and Disclaimer.