BMI Calculator
Free online BMI calculator for adults. Enter your height and weight in metric (cm/kg) or imperial (feet/inches and pounds) to get your Body Mass Index, the WHO weight category and a healthy weight range for your height — useful for fitness and weight management. It runs locally and nothing is uploaded. HealthRuns locally
Use this tool
How to use
- Choose Metric (cm, kg) or Imperial (ft/in, lb).
- Enter your height and weight.
- Tap “Calculate BMI” for your BMI, category and healthy weight range.
Frequently asked questions
What BMI is considered healthy?
Under WHO adult ranges, 18.5–24.9 is normal/healthy, below 18.5 is underweight, 25–29.9 is overweight and 30 or above is obese.
Does BMI apply to everyone?
BMI does not distinguish muscle from fat, so athletes, pregnant women, older adults and children may not fit the ranges. It is a screening reference, not a medical diagnosis.
Can I use feet, inches and pounds?
Yes — switch to Imperial and enter feet/inches and pounds; the calculator converts internally for you.