BMI, calories, body fat, heart rate zones and other everyday health calculators — every one free, illustrative, and not a substitute for medical advice.
The most-used health calculator on the site — Body Mass Index with a healthy-range explanation.
Open calculator →Body Mass Index with healthy range explanation.
LiveFree BMR calculator using the revised Harris-Benedict formula — resting calorie needs by weight, height, age and gender.
LiveUS Navy method body fat estimate from body measurements.
LiveDaily calorie needs based on BMR and activity level.
LiveFree heart rate zone calculator — estimated max HR and standard training zones (50-90%).
LiveFree ideal weight calculator using the Devine formula, a common clinical reference range.
LiveFree lean body mass calculator using the Boer formula, based on weight and height.
LiveFree macro calculator — split a daily calorie target into protein, carbohydrate and fat grams by percentage.
LiveFree pregnancy due date calculator using Naegele's rule (LMP + 280 days).
LiveFree running pace calculator — pace per kilometer or mile from total distance and time.
LiveFree steps-to-calories calculator — estimate calories burned from step count, stride length and body weight.
LiveFree waist-to-hip ratio (WHR) calculator with WHO general risk categories.
LiveFree water intake calculator — general daily hydration guideline based on body weight and activity.
No — every calculator here gives an illustrative estimate using standard public formulas (BMI, Harris-Benedict BMR, Devine ideal weight, etc.). They're useful for general tracking, not diagnosis. Always consult a doctor or registered dietitian for medical decisions.
BMI and BMR/Calorie are the most commonly used starting points for general fitness tracking. If you're training specifically, Heart Rate Zone and Macro calculators pair well with those.