BMI Calculator 2026 – Calculate Your Body Mass Index and Healthy Weight Range
The BMI calculator calculates your Body Mass Index based on height and weight. The result indicates whether your weight falls in the underweight, normal, overweight, or obesity range according to WHO classification.
Enter your height and weight, and the calculator computes your BMI value and healthy weight range. BMI is an approximate measure – it doesn't distinguish muscle from fat, so it may give misleading results for athletes. Body fat percentage and waist circumference provide a more complete picture.
What is a normal BMI value?
According to WHO classification, normal BMI is 18.5–24.9. Under 18.5 is underweight, 25–29.9 is overweight, and over 30 is obesity. For example, a person who is 5'7" (170 cm) tall has a normal weight range of 118–159 lbs (53.5–72 kg). The BMI calculator also shows how many pounds you are within the normal weight range.
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Browse all tools →The BMI calculator calculates your body mass index based on height and weight. A useful tool for weight and health monitoring, but the result is just one indicator among others.
Enter your height and weight, and the calculator computes your BMI and shows which category it falls into.
- Calculates BMI using the formula: weight (kg) / height (m)².
- Shows whether the result falls into underweight, normal, overweight, or obese categories.
- The result gives a quick overview of the weight-to-height ratio.
BMI is a simple screening tool, not a comprehensive health measure.
- BMI doesn't distinguish between muscle mass and fat tissue.
- For athletes and those with significant muscle mass, BMI may give misleading results.
- WHO BMI classifications are indicative population-level guidelines.
Body mass index is just one health indicator and doesn't tell the complete picture of health status.
- Children and adolescents' BMI is assessed on a different scale than adults'.
- Waist circumference and other measurements provide more accurate health impact information than BMI.
- For health-related concerns, always consult with healthcare professionals.