Health Calculators
Each tool is built on published clinical data with references provided. No accounts, no tracking, everything runs in your browser.
Caffeine Clearance
Model caffeine pharmacokinetics based on dose, body weight, and CYP1A2 metabolizer status. Includes a clearance curve and personalized cutoff time for sleep.
Sleep Debt Tracker
Enter your sleep over the past 7 days and see your cumulative deficit, severity assessment, and a gradual recovery plan.
Vitamin D Repletion
Calculate D3 dosing to reach your target 25-OH level based on current labs, body weight, BMI category, and timeframe.
Creatine Loading
Compare loading vs. daily dosing protocols. Optimal dose by lean body mass with saturation timeline chart.
Protein Intake
Find your daily protein target by body weight, goal (build, maintain, lose, health), activity level, and age.
Hydration Calculator
Estimate daily fluid needs by weight, activity, climate, and diet. Includes a hydration status self-check with symptom assessment.
Body Composition Tracker
Log your InBody or BIA scans over time. See your real fat loss and muscle rates, project when you hit a target body fat percentage, and get calorie and protein targets from measured lean mass.
TDEE Calculator
Total daily energy expenditure reported as an honest range instead of a fake-precise number, plus adaptive TDEE measured from your own weight and intake data.
Macro Calculator
Split a calorie target into protein, carbohydrate, and fat by goal and diet preference. Protein set from lean mass, fat floored for hormone health, with food portions.
Body Fat Estimator
US Navy circumference method with a visual reference scale, lean mass, goal weight projection, and a straight account of how it compares with DEXA.
Supplement Timing Optimizer
Check off your full stack and get a daily schedule that separates competing minerals, pairs fat-soluble vitamins with meals, and works around your medications.
Electrolyte Needs
Sodium, potassium, and magnesium from your climate, sweat rate, training, and diet. Includes a sweat rate test, desert heat guidance, and a DIY drink recipe.
Fiber Diversity Score
Score your prebiotic variety across nine fiber classes and the 30-plant benchmark, then get the specific foods that close your biggest gaps.
Iron Absorption Estimator
Estimate absorbed iron from dietary sources with co-factors and inhibitors. Coming soon.
Alcohol Metabolism
Estimate BAC clearance by weight, drinks, and time. Coming soon.