ABSI Calculator - A Body Shape Index

What Is the ABSI Calculator?

ABSI (A Body Shape Index) is a metric designed to assess abdominal fat distribution, addressing the limitations of traditional BMI (Body Mass Index). While BMI considers only height and weight, it doesn’t account for how fat is distributed throughout the body, particularly around the abdomen. Excess abdominal fat is closely linked to various health risks, including cardiovascular diseases and diabetes. ABSI provides a more comprehensive perspective for evaluating health risks.

The ABSI formula incorporates waist circumference alongside BMI calculations. The full ABSI formula is as follows:

$$ \text{ABSI} = \frac{\text{Waist Circumference (m)}}{\text{BMI}^{2/3} \times \text{Height (m)}^{1/2}} $$

The BMI formula, which is part of the ABSI calculation, is:

$$ \text{BMI} = \frac{\text{Weight (kg)}}{\text{Height (m)}^2} $$

For example, let’s calculate the ABSI for an adult with the following measurements:

• Height: 170 cm
• Weight: 70 kg
• Waist Circumference: 80 cm

First, calculate BMI:

$$ \text{BMI} = \frac{\text{70 (kg)}}{\text{1.70 (m)}^2} = 24.2 $$

Next, calculate ABSI:

$$ \text{ABSI} = \frac{\text{0.8 (m)}}{\text{24.2}^{2/3} \times \text{1.7 (m)}^{1/2}} = 0.07329 $$

How to Use the ABSI Calculator

The ABSI Calculator simplifies this complex formula. By inputting basic information, you can easily assess your ABSI score to understand your abdominal fat distribution and related health risks. Here's how it works:

1. Provide Personal Information:

   • Gender: Select your gender (male or female).
   • Age: Enter your age (range: 2 to 85 years).

2. Input Physical Measurements:

   • Height: Enter your height in either centimeters or inches.
   • Weight: Enter your weight in either kilograms or pounds.
   • Waist Circumference: Measure your waist circumference at the level of your navel, ensuring the tape is horizontal, and enter the value in centimeters or inches.

3. Review Your Results:

   • ABSI Score: The calculator will compute your ABSI based on the data you provide.
   • ABSI z-Score: This score reflects how your ABSI compares to people of the same age and gender.
   • Health Risk Assessment: Based on your ABSI z-score, the calculator will categorize your health risk level (e.g., low risk, average risk, or high risk).

Understanding Your Results

After using the ABSI Calculator, you’ll receive your ABSI score and z-score. The z-score compares your ABSI to the average for your age and gender group. Health risks are categorized based on the z-score range as follows:

ABSI z-Score Range	Risk Level	Description
Less than -0.868	Very Low Risk	Your body shape index is significantly below average, with low health risks.
-0.868 to -0.272	Low Risk	Your body shape index is slightly below average, with minimal health risks.
-0.272 to +0.229	Average Risk	Your body shape index is close to average, with typical health risks.
+0.229 to +0.798	High Risk	Your body shape index is above average, suggesting increased health risks.
Greater than +0.798	Very High Risk	Your body shape index is significantly above average, indicating high risks.