Body Mass Index (BMI) is the quickest screening check for whether your weight is in a healthy range for your height. It takes ten seconds.
BMI Calculator
Metric or US units โ your choice.
BMI is a screening measure, not a diagnosis โ athletes with heavy muscle can score high while being perfectly healthy.
How BMI is calculated
BMI = weight (kg) รท height (m)2. At 70 kg and 175 cm that is 70 รท (1.75 ร 1.75) = 22.9 โ Healthy weight.
BMI categories (adults)
| BMI | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 โ 24.9 | Healthy weight |
| 25.0 โ 29.9 | Overweight |
| 30.0 and above | Obesity |
Frequently asked questions
Is BMI accurate for everyone?
It is a population screening tool. It does not separate muscle from fat, so very muscular people, pregnant women and the elderly should treat it as a rough guide and check with a clinician.
What is a healthy BMI?
18.5 to 24.9 for most adults. For your height, the calculator above shows the exact healthy weight range in kg or lb.
How do I convert lb and inches?
Switch the Units box to US above. The formula then is BMI = (weight in lb รท height in inches2) ร 703.