Science-backed tools that give you personalized results in seconds — no sign-up required.
Your Total Daily Energy Expenditure is how many calories your body burns each day. It's the foundation of any diet or training plan — know this number first.
Once you know your TDEE, macros tell you what to eat. Protein, fats, and carbohydrates are optimized based on your specific goal — fat loss, muscle gain, or maintenance.
BMI gives a quick snapshot, but Body Fat % tells the real story. We use the Navy Tape Measure method — the most accurate non-lab approach available.
Train at the right intensity for your goal. Zone 2 is where fat is burned. Zone 5 is peak performance. The Karvonen formula uses your resting heart rate for superior precision.
Most people are chronically dehydrated. Your daily water needs depend on your body weight, climate, and how hard you train. Get a personalized recommendation here.
In 2026, recovery is training. Answer 8 quick questions to get your personalized Recovery Score and learn if you're overtraining or under-sleeping.
How many hours of sleep do you get on average?