The Body Mass Index (BMI) Calculator is a simple tool that helps you quickly assess your body weight relative to your height. It’s widely used as an initial screening to categorize weight status and assess potential health risks related to weight.
BMI is calculated by dividing your weight in kilograms by the square of your height in meters. This gives a number that falls into categories like underweight, normal weight, overweight, or obesity, helping you understand your general body composition.
Enter your weight and height in the fields provided, then press “Calculate” to get your BMI score along with the weight category and what it means for your health.
BMI is a quick and easy way to gauge if you’re in a healthy weight range. It helps:
Identify potential health risks linked with too low or too high body weight
Track changes in weight relative to height over time
Provide a starting point for discussions with healthcare providers
However, it’s important to remember that BMI is just one measurement — it doesn’t distinguish between muscle and fat mass or distribution of body fat.
The formula used is:
BMI = weight (kg) ÷ (height (m) × height (m))
Example:
Weight: 70 kg
Height: 1.75 m
Calculation:
BMI = 70 ÷ (1.75 × 1.75)
BMI = 70 ÷ 3.06 ≈ 22.9
This BMI value of 22.9 falls within the “Normal weight” category.
| BMI Range | Category | Health Implications |
|---|---|---|
| Below 18.5 | Underweight | Possible nutritional deficiency, risk of weakened immunity |
| 18.5 – 24.9 | Normal weight | Healthy weight range |
| 25.0 – 29.9 | Overweight | Increased risk of cardiovascular disease, diabetes |
| 30.0 and above | Obesity | High risk for chronic health problems |
BMI is a useful screening tool but has limitations:
It does not measure body fat percentage directly.
Athletes or muscular individuals may have a high BMI but low body fat.
It does not account for age, sex, ethnicity, or fat distribution.
For a complete health assessment, consider other measurements such as waist circumference or body fat analysis.