Personal health instrument
Know your number.
Enter your height and weight in whichever unit system you use. Your BMI is calculated instantly, on this page — nothing is sent anywhere.
| BMI | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 – 24.9 | Normal weight |
| 25.0 – 29.9 | Overweight |
| 30.0 and above | Obese |
What BMI does and doesn't tell you
Body Mass Index is a simple ratio of weight to height. It's a useful screening number at a population level, but it doesn't distinguish muscle from fat, and doesn't account for age, sex, bone structure, ethnicity, or pregnancy. Two people with the same BMI can have very different body compositions and health profiles.
Use this calculator as a starting point for a conversation, not a diagnosis. For a fuller picture of your health, talk to a doctor or a registered dietitian — see our medical disclaimer for more on this.