BMI calculator
Enter your weight and height to get your Body Mass Index and category — instantly, in your browser. Not uploaded to our servers for processing.
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Quick answer
BMI = weight (kg) ÷ height (m)². For example, 70 kg at 1.75 m is 22.9 (normal). Standard adult ranges: under 18.5 underweight, 18.5–24.9 normal, 25–29.9 overweight, 30+ obese. BMI is a rough screen, not a diagnosis.
Offline note
Your BMI
22.9
Category
Normal weight
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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 and similar screens are educational only — not a diagnosis or treatment plan. Talk to a qualified clinician about your health. Numbers are not uploaded to our servers for processing.
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 do BMI category ranges mean?
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 — inputs are not uploaded to our servers for processing.