FREE TOOLS
Health Calculators & Tools
Evidence-based health calculators built on peer-reviewed formulas. Get personalized recommendations for nutrition, supplements, sleep, and more.
TDEE & Calorie Calculator
Calculate your Total Daily Energy Expenditure and ideal calorie intake for any goal.
Use Calculator →Macro Calculator
Get your ideal protein, carb, and fat split based on your goals and body type.
Use Calculator →Body Fat % Calculator
Estimate your body fat percentage using the U.S. Navy method with measurements.
Use Calculator →Water Intake Calculator
How much water do you actually need? Personalized by weight, activity, and climate.
Use Calculator →Supplement Dosage Calculator
Evidence-based dosing for Vitamin D, Magnesium, Omega-3, and more by body weight.
Use Calculator →Sleep Cycle Calculator
Find your ideal bedtime or wake time based on 90-minute sleep cycles.
Use Calculator →Caffeine Half-Life Calculator
See when caffeine leaves your system and when to stop drinking coffee for better sleep.
Use Calculator →Inflammation Risk Score
Assess your chronic inflammation risk based on diet, lifestyle, and symptoms.
Use Calculator →Fasting & Autophagy Timer
Track your fast and see when autophagy, fat burning, and growth hormone kick in.
Use Calculator →Biological Age Estimator
Estimate your biological age based on lifestyle factors vs your chronological age.
Use Calculator →Why Use Health Calculators?
Generic health advice fails because every body is different. A 120-pound woman and a 220-pound man have completely different calorie needs, supplement dosages, and hydration requirements. These calculators use peer-reviewed formulas to give you personalized numbers based on your specific body metrics.