About Us
Online Medical Tools is a free resource providing evidence-based medical calculators and health tools. Our mission is simple: make health information accessible, accurate, and easy to understand.
What you'll find here
The calculators span a broad range of specialties: cardiology, nephrology, endocrinology, pulmonology, hematology, gastroenterology, dermatology, rheumatology, orthopedics, neurology, oncology, obstetrics, pediatrics, geriatrics, emergency medicine, infectious disease, mental health, and general body metrics and nutrition. Each one is built to answer a single, specific clinical question — a dose, a risk score, a lab-value interpretation — rather than trying to be a general-purpose symptom checker.
Our Principles
- Free to use. Every calculator on the site is free and usable without creating an account. An account is only needed if you want to save a result to your history or come back to it later.
- Privacy first. Every calculation runs entirely in your browser — your inputs are never sent to a server just to compute a result. Your account only holds data you choose to save, like a favorited calculator or a saved result log. Our Privacy Policy explains what analytics we use.
- Evidence-based. Our formulas come from peer-reviewed medical literature and established clinical references.
- Transparent. We show the formulas we use and explain what each result means.
How the calculators work
Each tool implements a specific published formula or clinical scoring system — things like the Cockcroft-Gault equation for creatinine clearance, the Revised Cardiac Risk Index, or the Mifflin-St Jeor equation for resting energy expenditure. Where a tool is based on a named clinical reference, we cite it directly on the tool's page so you can check the source yourself rather than take our word for it. The math runs client-side in your browser using standard JavaScript arithmetic — there's no server-side model or AI involved in producing a number, just the formula itself.
Who this is for
Online Medical Tools is built for anyone who wants a quick, sourced answer to a specific clinical calculation — patients trying to understand a number from a recent lab result or doctor's visit, students studying clinical formulas, and clinicians who want a fast second check alongside their own judgment. It's a reference tool, not a diagnostic one: a calculator result is a starting point for a conversation with a qualified healthcare provider, not a replacement for one.
Disclaimer
The tools and information provided on this website are for educational and informational purposes only. They are not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of a qualified healthcare provider with any questions you may have regarding a medical condition.
Contact
Have a question, suggestion, or feedback? We'd love to hear from you. Visit our contact page to get in touch.