Frequently Asked Questions

Each tool uses peer-reviewed medical formulas (like Mifflin-St Jeor for TDEE or CKD-EPI for eGFR). You enter your measurements, and the calculation runs instantly in your browser — no server is needed to compute the result.

Yes, completely free. There are no hidden fees, premium tiers, or paywalls. All current and future tools will remain free to use.

Most tools can be explored without an account. A free account is required to save results, favorites, and dashboard history.

We focus on privacy, speed, and simplicity. All calculations run locally in your browser with zero data collection. Our tools load instantly with no ads, pop-ups, or distractions.

We regularly review the medical literature and update our formulas when new guidelines are published. Each tool page shows the references used so you can verify the sources.

Online Medical Tools was created by a team passionate about making health information accessible. We combine medical knowledge with modern web technology to provide fast, reliable, and private health calculators.

Absolutely! We welcome suggestions. Visit our Contact page to send us your ideas for new calculators or improvements to existing tools. Community feedback helps us prioritize what to build next.

Not in an account unless you choose to save it. All calculations happen in your browser using JavaScript. If you create a free account and turn on auto-save, your inputs and results are saved to your account so you can review them later, and you can delete them at any time. Some calculators also put your inputs in the page address so you can share a link, and our analytics record page addresses. See our Privacy Policy for details.

We use essential cookies (for example, to keep you signed in) and Google Analytics cookies to understand how the site is used. You can reject analytics cookies in the cookie banner. We do not use advertising trackers, sell data to third parties, or build advertising profiles. See our Cookie Policy for full details.

Calculations run locally in your browser, so computing a result doesn't require sending your inputs to us. Nothing you enter is saved to an account unless you sign in and turn on auto-save. Some calculators put your inputs in the page address so you can share a link, and our analytics record page addresses. The site is served over HTTPS. See our Privacy Policy for details.

We don't sell your data or share it with advertisers. We use service providers to run the site: Supabase stores account data such as saved calculations, and Google Analytics measures site usage. See our Privacy Policy for details.

Yes. Every tool is fully responsive and works on smartphones, tablets, and desktop browsers. No app download is needed.

Most tools support both metric (kg, cm) and imperial (lbs, inches) units. You can switch between unit systems on each tool page.

Yes. Each tool provides a clear summary of your results that you can screenshot or print to share with your healthcare provider during your next visit.

First, double-check your input values and units. If the result still seems off, it may be because the formula has known limitations for certain populations. Each tool page includes information about when the formula may be less accurate. If you believe there's an error, please contact us.

Yes. Many of our tools complement each other. For example, you might use the BMI calculator alongside the body fat calculator for a more complete picture, or combine TDEE with macro calculators for nutrition planning. Our Compare feature lets you run related tools side by side.

The tools require an initial page load, but once loaded, all calculations run locally in your browser without needing an active internet connection. However, navigating to a new tool page will require connectivity.

These tools are for educational and informational purposes only. They are not a substitute for professional medical advice. Always consult a qualified healthcare provider before making health decisions.

We use well-established formulas from published medical literature. Each tool page cites the specific formula used. However, all estimation formulas have margins of error and may not be accurate for every individual.

Both. Healthcare professionals can use them as quick reference tools, while patients can use them to better understand their health metrics. The results should always be interpreted in clinical context.

Each calculator uses formulas from peer-reviewed medical journals and established clinical guidelines. The specific references are cited on each tool's page so you can verify the source and read the original research.

Each tool provides context for interpreting results, including normal ranges and what different values may indicate. However, individual results should always be discussed with a healthcare provider who can consider your complete medical history.

Most medical formulas were developed using specific study populations and may have limitations when applied to others. Each tool page notes any known population-specific considerations, such as age, ethnicity, or pregnancy status. Consult your doctor for personalized guidance.

Our tools work on all modern browsers including Chrome, Firefox, Safari, and Edge. We recommend keeping your browser updated to the latest version for the best experience.

All calculations are performed using JavaScript directly in your browser. This client-side approach means your data never travels to a server, making the tools both faster and more private.

Currently we don't offer embeddable widgets, but you're welcome to link to any of our tools from your website or blog. If you're interested in an embedding solution, please reach out through our Contact page.