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Home›Health Information›BMI Calculator
Healthy Weight

Calculate Your
BMI

Body Mass Index is a simple measure of weight relative to height. While not a complete picture of health, it's a useful first step in understanding whether your weight may be affecting your wellbeing.

Calculate my BMI → Speak to a GP
Healthy: BMI 18.5–24.9
WHO standard measure
BMI Analyser Active
22.4
BMI Score
Obese Over Normal Under
Normal Weight
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175cm
Height
⚖️
68.5kg
Weight
⚖️ BMI Calculator

Enter your height and weight for an instant result. BMI is one indicator of health — your GP can provide a fuller picture.

This calculator is for adults aged 18 and over. For children and young people please use our separate child BMI calculator. BMI is a screening tool, not a diagnostic measure.

BMI Categories
UnderweightBelow 18.5
Normal weight18.5 – 24.9
Overweight25.0 – 29.9
Obese Class I30.0 – 34.9
Obese Class II35.0 – 39.9
Obese Class III40.0 and above

Note: These ranges apply to adults. BMI may not be accurate for athletes, pregnant women, or people of certain ethnicities.

Under
Normal
Over
Obese I
Ob. II+
0 kg/m²
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Height
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Weight
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Ideal range (kg)
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Healthy weight range for your height
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This result is a general guide only and is not a substitute for professional medical advice. BMI does not account for muscle mass, bone density, age, ethnicity, or other individual factors. Please speak to your GP for a complete health assessment.
Understanding BMI

What your BMI means for your health

BMI is a useful starting point, but health is much more than a single number. Here's what else matters alongside your result.

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Physical Activity
Even within a 'healthy' BMI range, low fitness levels increase cardiovascular risk. Regular movement is independently protective.
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Diet Quality
What you eat matters as much as how much. A diet rich in vegetables, wholegrains, and lean protein supports metabolic health at any BMI.
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Waist Circumference
Fat distribution matters. A waist measurement above 88cm (women) or 102cm (men) indicates elevated risk regardless of BMI category.
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Sleep & Stress
Poor sleep and chronic stress disrupt hormones that regulate appetite and metabolism, contributing to weight gain over time.
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Blood Tests
Cholesterol, blood glucose, and blood pressure readings give a fuller picture of cardiometabolic health than BMI alone.
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NHS Health Check
Available free to all patients aged 40–74, our NHS Health Check includes BMI, BP, cholesterol and blood sugar — book via the online form.
Non-Emergency Medical Advice
NHS 111
For urgent medical questions that aren't life-threatening — available 24 hours a day, 7 days a week online or by phone.
Life-Threatening Emergency
999
Call 999 immediately if you or someone else is experiencing a medical emergency such as chest pain, difficulty breathing, or loss of consciousness.