Free Health & Fitness Calculators
Optimize your physical health, nutrition, and sleep hygiene. Calculate body mass index (BMI), total daily energy expenditure (TDEE), target protein requirements, and circadian sleep cycles using WHO, CDC, and NIH peer-reviewed formulas.
Ideal Weight Calculator
Find your healthy weight range based on 4 clinical formulas.
Macro Calculator
Calculate your daily protein, carb, and fat targets.
Intermittent Fasting Calculator
Live fasting timer and countdown. Track your 16:8, 18:6, or OMAD window in real time.
Body Fat Calculator
Calculate your body fat % with just a tape measure.
BMI Calculator
Check your Body Mass Index for health insights.
Calorie Calculator
Estimate your daily calorie needs.
Sun Exposure Calculator
Find your safe sun time and UV burn risk.
Water Intake Calculator
Estimate your daily hydration needs.
Sleep Calculator
Find your optimal wake-up times.
Stress Score Calculator
Assess your stress level based on symptoms.
Ovulation Calculator
Estimate your most fertile days.
Pregnancy Calculator
Calculate your baby's due date and track progress.
Air Quality Index Calculator
Check real-time global Air Quality Index (AQI), PM2.5, and health advisories for any city.
Clinical Standards & Evidence-Based Formulas
Standardized Physiological Models
Our metabolic calculators incorporate the Mifflin-St Jeor and Katch-McArdle equations—recognized by the Academy of Nutrition and Dietetics as the most accurate predictors of Resting Metabolic Rate (RMR) for diverse body types.
Demographic & Clinical Adjustments
We include WHO Asian BMI thresholds, CDC pediatric growth percentiles, and waist-to-height ratio (WHtR) risk matrices to deliver accurate health insights beyond generic weight numbers.