Browse our full library of 15 free, science-based health tools. Filter by category to find exactly what you need.
Calculate your Body Mass Index instantly with metric or imperial units and see your healthy weight range.
Use this tool →Calculate your Basal Metabolic Rate (BMR) — the calories you burn at rest — using the Mifflin-St Jeor equation.
Use this tool →Calculate your Total Daily Energy Expenditure and get a personalized calorie target for weight loss, maintenance or muscle gain.
Use this tool →Estimate your ideal body weight using four trusted medical formulas: Devine, Robinson, Miller and Hamwi.
Use this tool →Estimate your body fat percentage using the US Navy circumference method — no calipers needed.
Use this tool →Calculate your waist-to-hip ratio (WHR) to assess your risk of cardiovascular disease based on WHO guidelines.
Use this tool →Find out exactly how much water you should drink daily based on your weight, activity level and climate.
Use this tool →Calculate your ideal daily protein, fat and carbohydrate targets for weight loss, maintenance or muscle gain.
Use this tool →Calculate your maximum heart rate and personalized training zones for fat burn, cardio and peak performance.
Use this tool →Estimate your baby's due date and current gestational age based on your last menstrual period or conception date.
Use this tool →Predict your ovulation day and most fertile window based on your last period and average cycle length.
Use this tool →Estimate calories burned during walking, running, cycling, swimming, weight training and more activities.
Use this tool →Calculate your one-rep max (1RM) for any lift using the Epley and Brzycki formulas, plus a full percentage chart.
Use this tool →Find the ideal bedtime or wake-up time based on 90-minute sleep cycles to wake up feeling refreshed.
Use this tool →Check your blood pressure reading against official AHA categories, from normal to hypertensive crisis.
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