BMI Calculator
Your body mass index in one second, with the weight range considered healthy for your height. Then check body fat for a more honest picture.
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Example
A 5 ft 9 in (175 cm) person weighing 165 lb (75 kg) has a BMI of 24.5, in the healthy range; the healthy weight range for that height runs from about 125 to 168 lb.
Method and formula
BMI = weight (kg) divided by height (m) squared. Categories follow the WHO cut-offs: under 18.5 underweight, 18.5 to 24.9 healthy, 25 to 29.9 overweight, 30 and above obesity.
The healthy range is the weight that gives a BMI of 18.5 to 24.9 at your height.
Limits
- BMI ignores body composition: muscular people score high without excess fat.
- Cut-offs are adult, population-level thresholds; they do not apply to children, pregnancy or older adults in the same way.
- It is a screening number, not a diagnosis.
FAQ
Is BMI accurate for athletes?
No. Muscle is denser than fat, so lifters and athletes often read as overweight. A body fat estimate or waist measurement tells you more.
What is a healthy BMI?
Between 18.5 and 24.9 for adults according to the WHO. Where you sit in that range matters less than your body fat, fitness and habits.
Should I lose weight if my BMI is 26?
Not automatically. Look at body fat, waist size, blood markers and how you train. A coach or doctor can help you decide.
Free educational tool. Body composition, calorie and heart rate values are estimates from published formulas, not medical measurements. They do not replace a professional assessment. No weight-loss recommendation is intended for people under 18.