BMI Calculator
Check your Body Mass Index instantly.
Enter details
Enter your height and weight
Result
How it works
BMI (Body Mass Index) is a quick screening number based on weight relative to height.
BMI = weight (kg) / [ height (m) ]² Your input: 70 / (1.70)² = 24.2
WHO categories:
- < 18.5 — Underweight
- 18.5 – 24.9 — Normal weight
- 25 – 29.9 — Overweight
- ≥ 30 — Obese
BMI does not measure body fat directly and may misclassify very muscular or elderly people.
What is the BMI Calculator?
The BMI Calculator measures Body Mass Index — a quick screening number that tells you whether your weight is in a healthy range for your height. Enter your height and weight in metric units to get your BMI and category in one click.
BMI is a starting point for thinking about health and weight goals. It is widely used by doctors, gyms, and insurance providers as a first indicator, even though it does not capture everything about body composition.
How to use this calculator
- 1Enter your height in centimeters (or feet/inches if available).
- 2Enter your weight in kilograms.
- 3Click Calculate to see your BMI value and category (underweight, normal, overweight, obese).
- 4Use the result as a starting point — pair it with measurements like waist circumference for a fuller picture.
How it works
BMI is computed as weight in kilograms divided by height in metres squared: BMI = weight (kg) ÷ (height (m))². For example, 70 kg ÷ (1.75 × 1.75) ≈ 22.9.
The WHO classifies BMI under 18.5 as underweight, 18.5–24.9 as normal, 25–29.9 as overweight, and 30+ as obese. For South Asians, including Pakistanis, the threshold for overweight is often lowered to 23 due to higher metabolic risk at lower BMI.
BMI does not distinguish between fat and muscle, so very muscular people may show as overweight while their body fat is low.
BMI Calculator — FAQs
Common questions about the BMI Calculator.