Calculator Inputs
Results
BMI Categories
About This Calculator
Body Mass Index (BMI) is a simple screening measure that uses your height and weight to estimate whether you fall into an underweight, normal, overweight, or obese range. It's a useful starting point, though it doesn't directly measure body fat.
How It's Calculated
- Metric: weight (kg) ÷ height (m)²
- Imperial: (weight lb × 703) ÷ height (in)²
BMI Categories
- Below 18.5 — Underweight
- 18.5 – 24.9 — Normal weight
- 25.0 – 29.9 — Overweight
- 30.0 and above — Obese
BMI is a general indicator and may be less accurate for athletes (higher muscle mass) or older adults. Consult a healthcare professional for a full assessment.
Frequently Asked Questions
What is a healthy BMI?
A BMI between 18.5 and 24.9 is considered the healthy normal range for most adults. Below 18.5 is underweight and 25 or above indicates overweight or obesity.
Is BMI accurate for everyone?
BMI is a quick screening tool, not a diagnostic measure. It doesn't distinguish muscle from fat, so very muscular people may show a high BMI without excess body fat. Age, sex, and ethnicity also affect the interpretation.
How much should I weigh for a normal BMI?
For your height, a BMI in the normal range corresponds to about 53.5 – 72.0 kg. Reaching this range through balanced diet and activity supports long-term health.