BMI Calculator with Body Fat & Ideal Weight

WHO guidance for South and East Asian adults treats a BMI of 23 or more as overweight and 27.5 or more as obese, because health risks rise at lower BMI. Turn on the toggle to use them.

It uses neck, waist and hip circumferences and is usually within 3-4% of lab methods. Measure at the navel for waist and the widest point for hips.

It tracks belly fat, which BMI cannot see. Keeping your waist under half your height is a simple target linked to lower heart and diabetes risk.

No. Under 18, BMI must be compared with age- and sex-specific growth charts (percentiles). The calculator warns you when age is under 18.

Enter your height and weight. The BMI formula is: weight (kg) / height² (meters). In imperial: 703 × weight (lbs) / height² (inches). A BMI of 18.5-24.9 is considered healthy.

Underweight: below 18.5. Normal weight: 18.5-24.9. Overweight: 25-29.9. Obese: 30 and above. These are WHO guidelines for adults. BMI ranges for children differ by age and sex.

BMI is a useful screening tool but has limitations. It doesn't distinguish between muscle and fat, so muscular athletes may show as 'overweight' even at low body fat. It's also less accurate for elderly people who lose muscle mass. Use BMI as a guide, not a diagnosis.

For a healthy BMI of 18.5-24.9, your ideal weight range varies by height. Example: at 5'8" (173cm), the healthy weight range is approximately 125-163 lbs (57-74 kg). The calculator shows your specific range based on your height.

BMR is the number of calories your body burns at complete rest to maintain basic functions (breathing, circulation, organ function). It's the minimum calories needed per day. Multiply by an activity factor to find your daily calorie needs.

BMI uses height and weight only, it can't distinguish muscle from fat. Body fat percentage directly measures how much of your weight is fat vs. lean mass. A muscular athlete may have a 'overweight' BMI but a healthy 12% body fat. Body fat percentage is a more accurate health indicator but requires specialized equipment to measure.

BMI is your weight in kilograms divided by your height in metres squared (kg/m2). In imperial units it is weight in pounds x 703, divided by height in inches squared. Enter metric or imperial values and the tool does the math and shows your category.

Yes. The same BMI formula applies to adult men and women, and you can enter height and weight in metric (cm/kg) or imperial (ft-in/lb) units.

BMR is the number of calories your body burns at complete rest to keep basic functions running, a baseline for calculating daily calorie needs.