BMI calculator
Enter your weight and height to get your Body Mass Index and category — instantly, in your browser. Nothing is uploaded.
Your BMI
22.9
Category
Normal weight
BMI categories (adults)
| BMI | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 – 24.9 | Normal weight |
| 25.0 – 29.9 | Overweight |
| 30.0 and above | Obese |
Not medical advice. BMI is a general screening number, not a diagnosis, and it does not account for muscle, age, or body composition. Talk to a healthcare professional about your health.
Frequently asked questions
How is BMI calculated?
BMI = weight (kg) ÷ height (m) squared. In imperial units, BMI = 703 × weight (lb) ÷ height (in) squared. For example, 70 kg at 1.75 m is 70 ÷ (1.75 × 1.75) = 22.9.
What is a healthy BMI?
For adults, the standard ranges are: under 18.5 underweight, 18.5–24.9 normal, 25–29.9 overweight, 30+ obese. BMI is a rough screen — it does not account for muscle, age, or body composition.
Is BMI accurate for everyone?
No. BMI can misclassify athletes (high muscle), older adults, and different body types, and it is not used the same way for children. Treat it as a general indicator, not a diagnosis.
Is my data uploaded?
No. TryCalculatingNow calculates in your browser. Nothing you enter leaves your device.