Health & Body Calculators
Our health calculators give you quick, evidence-based figures to help you understand your body and make informed decisions about diet and fitness.
BMI ranges follow World Health Organization guidelines. Calorie estimates use the Mifflin-St Jeor equation — the most accurate formula validated for most adults. All tools support both metric (kg, cm) and imperial (lbs, ft/in) inputs.
Use these figures as a starting point for conversations with your doctor, dietitian, or trainer — not as a substitute for professional medical advice.
Most Used
Calculate your Body Mass Index (BMI) to check whether you are at a healthy weight for your height.
All Health Calculators (12 tools)
BMI Calculator
❤️Calculate your Body Mass Index (BMI) to check whether you are at a healthy weight for your height.
Use calculatorCalorie Calculator
❤️Estimate your daily calorie needs based on age, height, weight, and activity level.
Use calculatorIdeal Weight Calculator
❤️Find your ideal weight range based on height and gender using multiple established formulas.
Use calculatorPregnancy Due Date Calculator
❤️Calculate your estimated due date and see key pregnancy milestones based on your last menstrual period.
Use calculatorBody Fat Calculator
❤️Estimate your body fat percentage using the US Navy method based on body measurements.
Use calculatorMacro Calculator
❤️Calculate your optimal daily macronutrient intake — protein, carbohydrates, and fat — based on your goals.
Use calculatorWater Intake Calculator
❤️Calculate your recommended daily water intake based on your body weight, activity level, and climate.
Use calculatorHeart Rate Zone Calculator
❤️Calculate your target heart rate training zones using the Karvonen formula for more effective workouts.
Use calculatorSleep Calculator
❤️Calculate the best times to fall asleep or wake up based on 90-minute sleep cycles for more refreshing rest.
Use calculatorBAC Calculator
❤️Estimate your blood alcohol content (BAC) based on drinks consumed, body weight, gender, and time elapsed.
Use calculatorOvulation Calculator
❤️Estimate your ovulation date and fertile window based on your menstrual cycle length and last period date.
Use calculatorCalories Burned Calculator
❤️Calculate calories burned during exercise and daily activities using MET (Metabolic Equivalent of Task) values.
Use calculator