ABSI Calculator
Estimate your A Body Shape Index to understand abdominal fat distribution beyond BMI. ABSI combines waist circumference, height, and weight into a risk-aware score.
Enter Your Measurements
ABSI Results
ABSI
0.07329
BMI
24.2
Waist
0.800 m (31.5 in)
Height & Weight
1.70 m (66.9 in) • 70.0 kg (154.3 lb)
Interpretation
Below average body shape index – typically associated with lower abdominal adiposity.
How to Use This Calculator
Measure accurately
Record your height without shoes, your body weight on a calibrated scale, and waist circumference at the level of your belly button.
Select your units
Switch between metric and imperial units depending on your measurement tools. We convert everything to metric behind the scenes.
Review the output
Compare the ABSI score with the interpretation panel to understand how your abdominal shape compares with typical reference ranges.
Formula
ABSI = Waist / (BMI^(2/3) × Height^(1/2))
- Waist is measured in meters.
- Height is also in meters.
- BMI = Weight (kg) ÷ Height² (m²).
- The index was first published by Krakauer & Krakauer in 2012 to capture abdominal adiposity risk.
Example: waist = 0.85 m, BMI = 24.2, height = 1.70 m ⇒ ABSI = 0.85 ÷ (24.22/3 × 1.701/2) ≈ 0.0784.
What ABSI Tells You
The A Body Shape Index complements traditional BMI by incorporating waist circumference. Someone with the same BMI but a larger waist circumference will have a higher ABSI, signalling a higher cardiometabolic risk. Research shows that ABSI is associated with overall mortality, metabolic syndrome, and cardiovascular disease—especially in people with normal BMI who carry more abdominal fat.
Use ABSI to have informed conversations about lifestyle adjustments, nutrition, and exercise patterns. While the index is useful, it should be interpreted alongside other clinical findings and lab results.
Frequently Asked Questions
Is ABSI better than BMI?
ABSI and BMI serve different purposes. BMI estimates overall mass relative to height, while ABSI highlights abdominal fat distribution. Using both offers a clearer risk profile.
Which waist measurement should I use?
Use a soft measuring tape around the abdomen at the level of the iliac crest (top of the hip bones), usually close to the belly button, while standing and breathing out gently.
Do I need to fast or prepare before measuring?
No special preparation is required. For consistency, measure at the same time of day, ideally before meals and with minimal clothing.
Can ABSI be used for children?
ABSI reference ranges are validated mainly for adults. Pediatric risk assessment should rely on growth charts and pediatric-specific metrics.