BMI Calculator
Your BMI
24.5
Healthy
Healthy weight range for your height:
56.7kg – 76.3kg
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BMI Categories Explained
BMI 15-18.5
BMI 18.5-25
BMI 25-30
BMI 30-40
How BMI is calculated
Body Mass Index (BMI) is calculated by dividing your weight in kilograms by the square of your height in metres: BMI = weight (kg) ÷ height (m)². For example, someone weighing 75kg who is 1.75m tall has a BMI of 75 ÷ (1.75 × 1.75) = 24.5, which falls in the "healthy weight" band.
In imperial units the formula is weight (lbs) × 703 ÷ height (inches)². BMI was developed in the 19th century as a simple population-level screening tool, and it's still used by the NHS and doctors worldwide today because it's quick to calculate and correlates reasonably well with health risk across large groups of people.
Why BMI isn't the full picture
BMI is a useful starting point, but it has well-documented limitations that are worth understanding before you draw conclusions from a single number:
Muscle mass
Very muscular people (athletes, bodybuilders) often score "overweight" or "obese" on BMI despite having low body fat, because BMI cannot distinguish muscle from fat.
Age
Older adults tend to carry more fat and less muscle than younger adults at the same BMI, so the same score can mean different health risk depending on age.
Body fat distribution
BMI doesn't show where fat is stored. Fat around the waist and organs (visceral fat) carries more health risk than fat elsewhere, even at an identical BMI.
Sex differences
Women naturally carry a higher percentage of body fat than men at the same BMI, so the same number can represent different compositions.
What to do with your result
If your BMI falls outside the healthy range, it's worth discussing with a GP or healthcare professional rather than acting on the number alone — they can consider your waist measurement, body composition, family history and lifestyle together. Small, sustainable changes to diet and activity levels tend to be more effective long-term than drastic short-term measures. Our Calorie Calculator can help you understand your daily energy needs if you're planning a change.
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Frequently Asked Questions
What is a healthy BMI?
For adults, a BMI of 18.5–24.9 is considered healthy. Under 18.5 is underweight, 25–29.9 is overweight, and 30+ is obese.
Is BMI accurate?
BMI is a useful screening tool but has limitations — it doesn't account for muscle mass, bone density, or fat distribution. Athletes often have high BMIs despite being very healthy.
What is BMI used for?
Healthcare professionals use BMI to identify potential weight-related health risks and as a starting point for lifestyle conversations.
Key Terms Explained
Plain-English definitions of the financial terms used in this calculator.
- BMI (Body Mass Index)
- A screening measure of weight relative to height (kg ÷ m²). A BMI of 18.5–24.9 is classed as a healthy range for most adults, though it does not distinguish muscle from fat.
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Not Financial Advice: This calculator is for informational and educational purposes only. Results are estimates and do not constitute financial advice, recommendations, or regulated advice. We are not authorised or regulated by the Financial Conduct Authority (FCA). Always consult a qualified financial adviser for personalised advice. Tax treatment depends on your individual circumstances and may change. Tax laws and rates may change. Past performance does not guarantee future results.
