Health math that’s actually human.

We build free, science-backed health calculators so anyone can understand their body — without paywalls, ads, or confusing medical jargon.

100% Free, always · Zero health data stored

Our Mission

Everyone deserves access to accurate health information. HealthCal.org was built on one belief: that the tools doctors and dietitians use shouldn’t be locked behind subscription fees or buried inside clinical textbooks. We take the formulas clinicians actually use and turn them into clear, actionable numbers — so anyone can understand their body without needing a medical degree.

What We Stand For

🔬 Science first
Every formula we use is grounded in peer-reviewed research. We cite our sources and update our tools when the evidence changes.

🔓 Always free
No paywalls, no premium tiers, no sign-up required. Our tools are — and always will be — free to use for everyone.

🤝 Honest results
We give you accurate numbers, not flattering ones. Health decisions deserve real data, not what you want to hear.

🔒 Private by design
Your health data stays on your device. We do not store, sell, or share any personal information you enter into our calculators.

Our Story

HealthCal.org was founded by a small team of health enthusiasts, developers, and researchers who got tired of searching for reliable health calculators — and landing on sites cluttered with ads, broken formulas, or advice that hadn’t been updated since 2009.

We built the site we wished existed: clean, fast, accurate, and honest. What started as a handful of essential calculators has grown into a comprehensive platform — and we’re still growing, one well-researched tool at a time.

We’re a small, independent team that cares more about helping people than chasing growth metrics. Every calculator we publish goes through clinical review before it goes live, and every number we show you is one we’d stand behind in a doctor’s office.

The Team

Dr. Tanzeela — Medical Advisor & Co-Founder
Board-certified physician with 12 years of clinical practice. Tanzeela reviews every formula and health claim on the site to ensure clinical accuracy and patient safety.

Marcus Silva — Lead Developer & Co-Founder
Full-stack engineer with a background in health-tech. Marcus built the core calculator engine and obsesses over making every tool fast and accessible on any device.

Layla Osei, RD — Registered Dietitian & Content Lead
Layla translates clinical nutrition science into plain English. She writes every explainer, FAQ, and tool description — and double-checks that the advice is actually usable in real life.

Get in Touch

Have a question, spotted an error, or just want to say hello?
Reach us at hello@healthcal.org

HealthCal.org provides general health and wellness information for educational purposes only. Our calculators and content are not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making changes to your diet, exercise, or health routine.

Science-backed formulas · No personal data stored · Free forever