BMI Calculator
Calculate BMI as weight (kg) divided by height in metres squared, with the WHO category cut-offs. An estimate and a screening tool only — it cannot tell muscle from fat, so use it alongside waist measurements and body-fat estimates.
Your BMI — body mass index
24.2
Normal weight — Healthy range. Healthy weight for your height: 53.5–72.0 kg.
WHO BMI categories
| BMI | Category |
|---|---|
| < 18.5 | Underweight |
| 18.5 – 24.9 | Normal weight |
| 25.0 – 29.9 | Overweight |
| 30.0 – 34.9 | Obesity class I |
| 35.0 – 39.9 | Obesity class II |
| ≥ 40.0 | Obesity class III |
BMI is a screening tool only — it cannot tell muscle from fat, so a muscular person can score “overweight” while being lean. Use it alongside waist circumference and body-fat estimates, and talk to a clinician before acting on a high result.
Formula & source — BMI — World Health Organization cut-offs
BMI = weight (kg) ÷ height (m)². Categories are the WHO cut-offs (underweight < 18.5, normal 18.5–24.9, overweight 25–29.9, obese ≥ 30).
Estimate, not medical advice. FitCalc results are estimates based on population-average formulas. They are not a diagnosis, a prescription, or a substitute for professional medical advice. If you have a medical condition, are pregnant, or take medication, talk to a doctor or registered dietitian before changing your diet or exercise. FitCalc claims no medical credentials.
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