Free Health Calculators
& Assessment Tools
Use our science-based calculators to understand your body better — and get personalized recommendations based on your results. 100% free, no sign-up required.
Find your exact heart rate zones for maximum fat oxidation using the Karvonen formula. Personalized to your age, resting HR, and fitness level.
Calculate the exact daily calorie deficit needed to reach your target weight in a specific timeframe — safely and sustainably.
Estimate your metabolic age based on body composition and lifestyle factors — and discover what it means for your long-term health.
How much protein does your body actually need? Get your personalized daily target based on your goal — weight loss, muscle gain, or maintenance.
Answer 8 questions about your digestion, diet, and lifestyle. Get a personalized microbiome score and targeted recommendations.
Find out which probiotic strains your body needs most based on your symptoms, diet, and health goals.
A quiz to assess your sleep quality, identify patterns, and get personalized supplement recommendations for better rest.
Identify how chronic stress is affecting your body and what adaptogens or lifestyle changes may help most.