BMI Calculator

How Is BMI Calculated?

BMI (Body Mass Index) is a simple measure of body fat based on your height and weight. The formula is:

BMI = Weight (kg) ÷ Height (m)²

For imperial units:

BMI = (Weight in lbs × 703) ÷ (Height in inches)²

For example, a person weighing 70 kg with a height of 170 cm (1.70 m) would have a BMI of 70 ÷ (1.70 × 1.70) = 24.2.

Why Use Asian / Indian BMI Standards?

Research shows that Asian populations, including Indians, tend to have a higher percentage of body fat at any given BMI compared to Western populations. This means health risks like type 2 diabetes and cardiovascular disease can appear at lower BMI values.

The WHO Asia-Pacific guidelines recommend lower cutoff points: 23 kg/m² for overweight and 25 kg/m² for obesity in Asian populations, compared to 25 and 30 in the standard WHO classification.

The Indian Consensus Group and the American Diabetes Association both support using these lower thresholds when screening Asian populations.

Limitations of BMI

While BMI is a useful screening tool, it has some important limitations:

• Muscle vs Fat: BMI cannot distinguish between muscle mass and fat. Athletes or muscular individuals may show a high BMI despite being healthy.
• Age Factor: Older adults may have more body fat at the same BMI compared to younger adults.
• Body Fat Distribution: BMI does not show where fat is stored. Abdominal (visceral) fat is more dangerous than fat in other areas.
• Gender Differences: Women typically have more body fat than men at the same BMI.

For a more complete picture, consider measuring your waist circumference and consulting a healthcare provider.