Optimize Your Health with Data
20+ free calculators for nutrition, fitness, sleep, and wellness. All tools are science-based, private, and require no account.
Popular Calculators
20+ free tools for nutrition, fitness, sleep, and wellness. Here are some of our most popular calculators.
TDEE Calculator
Calculate your Total Daily Energy Expenditure and get personalized calorie targets for your goals.
Sleep Debt Calculator
Track your accumulated sleep deficit and discover how long you need to recover for optimal health.
Body Fat Calculator
Estimate your body fat percentage using the US Navy method. See fat mass, lean mass, and fitness category.
One Rep Max Calculator
Calculate your one rep max from any weight and rep count. Get training percentages for strength goals.
Biological Age Calculator
Discover your body's true age based on lifestyle factors. See how your habits affect aging.
Caffeine Half-Life Tracker
Track caffeine intake and calculate remaining levels in your system to predict effects on sleep.
Why BodyMath?
Our calculators are built on peer-reviewed research and designed with user privacy in mind.
Evidence-Based
All calculations are based on peer-reviewed scientific research and validated methodologies.
Privacy First
All calculations happen in your browser. We don't store or track your personal data.
Mobile Friendly
Responsive design works perfectly on any device, from phones to desktop computers.
Frequently Asked Questions
Everything you need to know about BodyMath calculators.
Are these calculators medically accurate?
All our calculators are based on peer-reviewed scientific research and validated methodologies. However, they are educational tools and should not replace professional medical advice. Always consult healthcare professionals for medical decisions.
Is my data stored or tracked?
No. All calculations happen entirely in your browser. We don't store, track, or transmit any of your personal data. Your privacy is our top priority.
Do I need to create an account?
No account needed! All calculators are completely free and accessible without registration. Just visit the calculator page and start using it immediately.
Can I use these calculators on mobile?
Yes! All our calculators are fully responsive and work seamlessly on smartphones, tablets, and desktop computers. The interface adapts to your screen size for the best experience.
Will these calculators always be free?
Yes! BodyMath is committed to keeping all calculators free forever. We believe everyone should have access to science-based health tools without barriers.
How do I interpret the results?
Each calculator provides detailed explanations alongside your results. We also include scientific context, practical recommendations, and FAQs specific to each tool to help you understand and apply the insights.
Ready to Optimize Your Health?
Start using our free calculators today to make data-driven decisions about your sleep, energy, and overall wellness.
Get Started Now