CalcHub
BMI Calculator
Body Mass Index with WHO classification.
BMI = weight (kg) ÷ height (m)². WHO thresholds: 18.5 underweight, 25 overweight, 30 obese.
- What is a healthy BMI?
- The WHO range for normal weight is 18.5–24.9. Below 18.5 is underweight, 25–29.9 is overweight, and 30+ is obese.
- Does BMI work for everyone?
- BMI is a screening tool for population averages. It can misclassify athletes (high muscle mass) and does not measure body fat directly.
- How is the healthy weight range calculated?
- It inverts the formula: for your height, the weight that maps to a BMI of 18.5–24.9. For 170 cm that is roughly 53.5–72 kg.
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