BMI is a rough guideline that doesn't account for muscle mass or body frame. For a more precise assessment, the body fat calculator is a useful addition.
Health & Body
Body mass index, calorie needs or body fat percentage – health calculators give you a quick read on your body metrics, but they don't replace medical advice. The formulas used (such as Mifflin-St Jeor for basal metabolic rate or the U.S. Navy method for body fat) are scientifically recognised standard methods.
Whether it's training planning with heart rate zones, the right fluid intake during sport, or classifying your waist-to-hip ratio and BMI: the calculators in this category cover everyday life, nutrition and fitness alike.
19 calculators in this category
Body Metrics
BMI, body fat, ideal weight and more
BMI Calculator
Enter weight and height – see your category instantly
Body Fat Calculator
Calculate body fat percentage with a tape measure – for men and women
Ideal Weight Calculator
Ideal weight by height and gender – calculate for free
Waist-Hip Ratio Calculator
Enter waist and hip circumference – see your risk instantly
WHtR Calculator
Enter waist circumference and height – get an instant risk assessment
Body Surface Area Calculator
Enter height and weight – get your body surface area in m² instantly
Nutrition & Calories
Calorie needs, macros and fluid requirements
Calorie Needs Calculator
Mifflin-St Jeor equation with PAL factor – for men and women
Water Intake Calculator
Daily recommendation based on body weight and activity – with an exercise surcharge
Calories Burned Calculator
Enter sport, weight and duration – get your calorie burn instantly
Macronutrient Calculator
Enter calories and a split – read off gram amounts instantly
Sports Hydration Calculator
Enter weight and exercise duration – get your daily water needs instantly
Weight Loss Duration Calculator
Enter your calorie deficit – get the estimated weight loss duration instantly
Fitness & Prevention
Heart rate zones, blood alcohol and pregnancy weight
Blood Alcohol Calculator
Widmark formula with elimination over time – for information only, not proof of fitness to drive
Heart Rate Zone Calculator
Enter your age – see 5 heart rate zones and max heart rate instantly
Pregnancy Weight Calculator
Enter weight and height – get the IOM recommendation instantly
Period Calculator
Enter your last period and cycle length – get your next period instantly
One-Rep Max Calculator
Enter your training weight and reps – compare Epley and Brzycki estimates
Smoking Cost Calculator
Enter cigarettes per day and pack price – calculate costs instantly
Sleep Calculator
Based on the 90-minute sleep cycle: wake up more refreshed instead of mid deep sleep
Frequently asked questions about Health & Body
No. All health calculators are intended for general guidance only, not for medical diagnosis.