Overweight Calculator
Calculate your BMI and Ponderal Index to determine if you are overweight, underweight, or normal weight. Free health assessment tool with category breakdowns and charts.
About This Calculator
The Overweight Calculator helps you determine if your body weight falls within a healthy range using two scientifically validated metrics: Body Mass Index (BMI) and Ponderal Index (PI). Simply enter your weight and height to get an instant assessment of your weight status.
BMI is calculated by dividing your weight in kilograms by the square of your height in meters (BMI = kg/m\u00b2). The Ponderal Index divides your weight by the cube of your height (PI = kg/m\u00b3), which can be a more accurate indicator for children and adolescents. Based on your results, the calculator classifies you as underweight, normal weight, overweight, or obese according to WHO standards.
The calculator also shows your healthy weight range \u2014 the weight range corresponding to a normal BMI of 18.5-24.9. Use this as a target range when setting weight management goals.
BMI Categories (WHO Standards)
- Underweight: BMI less than 18.5
- Normal weight: BMI 18.5-24.9
- Overweight: BMI 25-29.9
- Obese: BMI 30 or higher
Ponderal Index Categories (Adults)
- Underweight: PI less than 11
- Normal weight: PI 11-15
- Overweight: PI 15-17
- Obese: PI more than 17
Note: BMI and PI are screening tools and are not diagnostic. Consult a healthcare professional for proper medical assessment.
Frequently Asked Questions
What BMI is considered overweight?
A BMI between 25 and 29.9 is considered overweight. BMI below 18.5 is underweight, 18.5-24.9 is normal weight, and 30 or above is obese. Our calculator computes both your BMI and Ponderal Index to give a comprehensive assessment of your weight status.
How is BMI calculated for the overweight test?
BMI is calculated by dividing your weight in kilograms by your height in meters squared (BMI = weight / height\u00b2). For example, if you weigh 85 kg and are 1.75 m tall: BMI = 85 / (1.75 \u00d7 1.75) = 27.8, which falls in the overweight category. Enter your weight and height in our calculator for an instant result.
What is the Ponderal Index and how is it different from BMI?
The Ponderal Index (PI) divides weight by the cube of height (PI = weight / height\u00b3), unlike BMI which uses height squared. PI may be a better indicator of body mass for children and adolescents. For adults, PI below 11 is underweight, 11-15 normal, 15-17 overweight, and above 17 is obese. Our calculator provides both measurements.
What percentage of Americans are overweight?
According to the CDC, approximately 30.7% of American adults are overweight and about 42% are obese. In the UK, the obesity rate is 26.94%, while in India it is lower at around 3-5% obesity but a higher percentage of abdominal obesity. Worldwide, overweight and obesity rates have tripled since 1975 according to WHO data.
What is a healthy weight range for my height?
For a given height, the healthy weight range corresponds to a BMI of 18.5 to 24.9. For someone 170 cm tall, the healthy weight range is approximately 53.5 kg to 72 kg. Our calculator shows your healthy weight range based on your height along with your current BMI status.
Can you be overweight but still healthy?
Some people with BMI 25-27 can be metabolically healthy if they maintain good blood pressure, blood sugar, and cholesterol levels. However, as BMI increases above 27-28, health risks generally increase regardless of metabolic markers. Waist circumference and body fat percentage provide additional health insights beyond BMI alone.
What is the ICD-10 code for overweight?
The ICD-10 code for overweight is E66.3, which falls under the endocrine, nutritional, and metabolic diseases category. Other obesity-related ICD-10 codes include E66.1 (drug-induced obesity), E66.2 (severe obesity with alveolar hypoventilation), E66.8 (other obesity), and E66.9 (obesity, unspecified).
How accurate is BMI for determining if someone is overweight?
BMI is a useful screening tool but has limitations. It does not distinguish between muscle and fat mass, so athletes may have a high BMI despite low body fat. It also does not account for age, gender, bone density, or fat distribution. For a more complete assessment, combine BMI with waist circumference, body fat percentage, and other health markers.