Key Takeaways
- ABSI (A Body Shape Index) measures health risk from abdominal obesity
- Unlike BMI, ABSI accounts for waist circumference relative to height and weight
- Higher ABSI values indicate greater mortality risk
- ABSI is particularly useful for people with "normal" BMI but high waist circumference
- Reducing waist circumference can lower your ABSI and health risks
About the Body Shape Index (ABSI) Calculator
The Body Shape Index (ABSI) Calculator is a comprehensive online tool designed to help you assess health risks associated with abdominal obesity. While BMI measures overall body mass, ABSI specifically evaluates your waist circumference relative to your height and BMI, providing a more nuanced picture of health risks related to body shape.
Understanding the ABSI Formula
ABSI = Waist Circumference / (BMI2/3 x Height1/2)
This formula was developed by researchers Krakauer and Krakauer in 2012. The ABSI is designed to be largely independent of height and BMI, isolating the health effects of abdominal obesity from overall body size.
How to Use This Calculator
Measure Your Waist Circumference
Use a tape measure around your natural waistline (usually at the navel level). Measure in centimeters for accuracy.
Enter Your BMI
If you don't know your BMI, calculate it first: BMI = weight (kg) / height (m)2. You can use our BMI calculator.
Enter Your Height
Input your height in meters (e.g., 1.75m for 175cm or 5'9").
Interpret Your Results
The calculator provides your ABSI score, z-score, and relative mortality risk compared to average.
Why ABSI Matters
Research has shown that abdominal fat (visceral fat) is more metabolically active and poses greater health risks than fat stored in other areas. ABSI captures this risk by specifically measuring the proportion of body mass located in the abdomen.
ABSI vs BMI: Key Differences
- BMI measures total body mass relative to height, but cannot distinguish between muscle and fat or where fat is stored
- ABSI specifically measures abdominal obesity, which is more strongly linked to metabolic disease
- A person with "normal" BMI can have elevated ABSI if they carry excess abdominal fat
- ABSI provides additional predictive power for mortality risk beyond BMI alone
Understanding Your ABSI z-score
The ABSI z-score tells you how your ABSI compares to the population average:
- z-score = 0: Your ABSI equals the population average
- z-score < 0: Your ABSI is below average (lower risk)
- z-score > 0: Your ABSI is above average (higher risk)
- Each unit of z-score represents approximately 1 standard deviation from the mean
Health Implications
Studies have linked higher ABSI values to increased risk of:
- All-cause mortality
- Cardiovascular disease
- Type 2 diabetes
- Metabolic syndrome
- Certain cancers
Frequently Asked Questions
A "good" ABSI score is one that is at or below the population average (z-score near 0 or negative). The average ABSI is approximately 0.0800. Lower values indicate lower health risk from abdominal obesity.
Research shows ABSI adds predictive power for mortality risk beyond BMI and waist circumference alone. However, it should be used as one of many health indicators, not as a sole diagnostic tool. Always consult with healthcare professionals.
Yes! Reducing waist circumference through a combination of diet, exercise (especially aerobic exercise), and lifestyle changes can lower your ABSI. Focus on reducing visceral fat through consistent cardiovascular exercise and a balanced diet.
ABSI and BMI measure different things and are best used together. BMI provides a general measure of body mass, while ABSI specifically captures abdominal obesity risk. Using both gives a more complete picture of body composition-related health risks.
Measure your waist at the narrowest point, usually at the navel or just above the hip bones. Stand relaxed, exhale normally, and wrap the tape measure snugly (but not tight) around your waist. Measure in centimeters for the calculator.