Our mission
The TDEE & Body Fat Calculator is a free online tool designed to make health and fitness math simple. Instead of guessing, you can estimate your maintenance calories, basal metabolic rate (BMR), body fat percentage, and weight-change timelines in seconds — directly in your browser. Everything runs client-side, so your inputs never leave your device unless you choose to share them.
What this calculator estimates
- Total Daily Energy Expenditure (TDEE): calories you burn per day at your current activity level, based on the trusted Mifflin–St Jeor formula.
- Body fat percentage: a fast estimation using the official U.S. Navy circumference method (neck, waist, and — for women — hips).
- Macros and goal calories: simple recommendations for fat loss, muscle gain, recomposition, or maintenance.
- Goal timelines and weight bands: realistic projections for reaching a target weight or body fat goal.
Who builds this
This platform is developed by Varyense, an IT company focused on building useful digital tools and calculators that help users make informed decisions. We design every tool with three priorities in mind: accuracy, privacy, and clarity. Our team believes that essential calculators — for fitness, finance, productivity, and beyond — should be free, fast, and accessible to everyone on every device.
Why people trust this calculator
- Transparent formulas: we use industry-standard equations (Mifflin–St Jeor, U.S. Navy method) and explain how each result is calculated.
- Privacy first: calculations run in your browser. We do not require accounts and do not store your measurements.
- Responsive design: the interface is built mobile-first and works on phones, tablets, and desktops with full light and dark mode support.
- Always free: no paywalls, no premium tiers — just a clean tool that loads in milliseconds.
How to use the calculator
- Open the home page and choose between the TDEE or body fat tab.
- Enter your age, height, weight, gender, and activity level.
- Optionally set a goal weight and training days to estimate timelines and macro splits.
- Review the live results — including BMR, TDEE, lean body mass, and weekly calorie cycling guidance.
Disclaimer
All estimates are educational and informational only. They do not replace personalized medical, nutritional, or fitness advice from a qualified professional. Always consult a clinician before making major changes to your diet, training routine, or health plan.
Stay in touch
Got feedback, feature requests, or partnership ideas? We'd love to hear from you. Visit our contact page to send a message.