🏥 Free Health Calculators
Evidence-based health tools — no signup required
BMI Calculator
Calculate your Body Mass Index from height and weight. See your BMI category instantly.
Calorie Calculator
Find your daily calorie needs using the Mifflin-St Jeor equation for weight loss, maintenance, or gain.
Macro Calculator
Split your daily calories into optimal protein, carbs, and fat based on your goal.
Water Intake Calculator
Find out how much water you should drink daily based on your weight and activity level.
Body Fat % Calculator
Estimate your body fat percentage using the US Navy method with simple measurements.
Ideal Weight Calculator
Find your ideal body weight using four established medical formulas.
Heart Rate Zone Calculator
Calculate your 5 training heart rate zones for optimal exercise intensity.
Sleep Calculator
Find the best times to sleep or wake up based on 90-minute sleep cycles.
Pregnancy Due Date Calculator
Estimate your due date and trimester timeline from your last menstrual period.
BMR Calculator
Calculate your Basal Metabolic Rate — the calories your body burns at complete rest.
⚕️ Health Disclaimer: These calculators are for educational and informational purposes only. They are not a substitute for professional medical advice, diagnosis, or treatment. Always consult your physician or qualified health provider with any questions about a medical condition.