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BMI Calculator
Calculate your Body Mass Index instantly. Supports Metric and Imperial units. All calculations happen in your browser.
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BMI Range
Underweight
<18.5 Normal
18.5-24.9 Overweight
25-29.9 Obese
>30
<18.5 Normal
18.5-24.9 Overweight
25-29.9 Obese
>30
Health Insight
How To Calculate BMI
1
Select Unit
Choose Metric or Imperial.
2
Enter Data
Input weight and height.
3
Calculate
Get instant results.
4
Review
Check your category.
BMI is a simple calculation using a person's height and weight. The formula is BMI = kg/m2 where kg is a person's weight in kilograms and m2 is their height in metres squared. It is a useful indicator of whether you're at a healthy weight.
BMI is a useful screening tool but has limitations. It doesn't distinguish between muscle and fat mass. Athletes may have a high BMI due to muscle, while older adults may have a "normal" BMI but unhealthy body composition. It should be used alongside other health metrics.
For most adults, an ideal BMI is in the 18.5 to 24.9 range. Below 18.5 is considered underweight. Between 25 and 29.9 is overweight. A BMI of 30 or higher indicates obesity. These ranges apply generally but individual health factors matter.
BMI is not suitable for children, pregnant women, or very muscular individuals. For children, BMI percentiles are used relative to age and sex. Elderly people may have different healthy ranges. Always consult a healthcare professional for personalized advice.
Privacy Notice: All BMI calculations are performed in your browser. No personal data is stored or transmitted.
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