Question 1

What is BMI and how is it calculated?

Accepted Answer

BMI (Body Mass Index) is a measure of body fat based on height and weight. It's calculated as: weight (kg) / height (m)². For imperial units: weight (lbs) × 703 / height (inches)².

Question 2

What are the BMI categories?

Accepted Answer

Underweight: BMI < 18.5 | Normal weight: 18.5–24.9 | Overweight: 25–29.9 | Obese: ≥ 30. These are WHO (World Health Organization) standard categories.

Question 3

Should I use metric or imperial?

Accepted Answer

Use whichever you're most comfortable with — the calculation is the same. Metric uses kg and cm; imperial uses pounds and inches. Choose the unit toggle at the top.

Question 4

Is BMI accurate for everyone?

Accepted Answer

BMI is a general screening tool, not a direct measure of body fat. It may overestimate body fat in muscular individuals (like athletes) and underestimate in sedentary people. Talk to a doctor for personalized health guidance.

Question 5

Do you store my health data?

Accepted Answer

No. Your BMI is calculated in your browser and never stored or transmitted. We don't see your data.

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