About FitCalcs
FitCalcs is a free collection of 43+ fitness and health calculators, built to give you instant, science-based results without sign-ups, paywalls, or invasive tracking.
Our Mission
We believe everyone should have access to accurate health and fitness tools. Whether you're calculating your daily calories, finding your ideal macros, checking your heart rate zones, or estimating your VO2 max â you shouldn't need to create an account or pay for it.
What We Offer
Our tools are organized into 8 categories:
- ð Body Composition â 6 tools
- ð Nutrition â 6 tools
- ðŊ Weight Goals â 5 tools
- ðïļ Strength & Lifting â 4 tools
- ð Cardio & Activity â 10 tools
- ð Health & Wellness â 7 tools
- ðĪ° Pregnancy â 2 tools
- ð Supplements & Substances â 3 tools
Our Approach
- Science-based: Every calculator uses peer-reviewed formulas (Mifflin-St Jeor, US Navy method, Tanaka, Epley, IOM guidelines, etc.)
- Privacy-first: All calculations happen in your browser. We never collect, store, or transmit your health data.
- Fast: Static site generation means every page loads in milliseconds. No server processing, no waiting.
- Free: All tools are 100% free with no sign-up required. We sustain the project through non-invasive advertising.
- Metric + Imperial: Every calculator supports both unit systems.
Important Disclaimer
FitCalcs provides estimates based on general population formulas. Our tools are for informational and educational purposes only. They are not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional before making health decisions.
Get Started
Browse our full collection of calculators and find the tools that help you reach your goals.