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BMI Calculator UK
Calculate your Body Mass Index using NHS guidelines.
📖 What is BMI?
Body Mass Index (BMI) is a simple measure using your height and weight to estimate whether you are underweight, a healthy weight, overweight, or obese. It is used by the NHS as a first screening tool — not a diagnosis.
BMI under 18.5 = Underweight · 18.5–24.9 = Healthy · 25–29.9 = Overweight · 30+ = Obese · Not suitable for athletes, pregnant women, or children
Your BMI
24.5
Healthy Weight
You're in the healthy range. Keep it up!
NHS BMI Categories
UnderweightUnder 18.5
Healthy weight18.5 – 24.9
Overweight25 – 29.9
Obese (Class I)30 – 34.9
Obese (Class II+)35+
Your healthy weight range: 56.7kg – 76.3kg
BMI is a screening tool, not a diagnostic measure. Source: NHS. Consult your GP for health advice.
Sources & References
BMI thresholds are based on NHS guidelines. BMI is a screening tool only — not a substitute for medical advice.