ABSI Calculator - A Body Shape Index

Your details

Used to look up the age- and sex-specific NHANES reference mean and standard deviation.
Age from 2 to 85 years. Used to select the correct NHANES reference population.
years
Your standing height, measured without shoes.
cm
Your body weight.
kg
Measure horizontally around your bare abdomen at the midpoint between your lowest rib and the top of your hip bone (iliac crest), typically near the navel. Breathe out normally before reading.
cm
ABSIVery Low Risk
0.07556m^(11/6) kg^(-2/3)

A Body Shape Index: waist circumference normalized for height and BMI

ABSI Z-Score-1.35
Mortality RiskVery Low Risk
BMI (used in ABSI)26.1kg/m²
Waist (cm)88cm
-1.35 z
Very Low Risk<-0.868Low Risk-0.868--0.272Average Risk-0.272-0.229High Risk0.229-0.798Very High Risk0.798+

Your ABSI is 0.07556, z-score -1.35 (Very Low Risk).

  • Your ABSI z-score of -1.35 places you in the very low risk quintile compared with people of the same age and sex in the NHANES reference population.
  • Your BMI of 26.1 is already above the healthy-weight threshold. ABSI adds information about where that excess weight is stored, abdominal fat carries more cardiometabolic risk than fat distributed elsewhere.
  • Your waist circumference of 88.0 cm is relatively lean for your height and weight, which is reflected in your below-average ABSI z-score.
  • ABSI is a statistical risk indicator, not a clinical diagnosis. Use it alongside BMI, waist-to-height ratio, and advice from a healthcare professional.

Next stepMaintain regular physical activity and a balanced diet to keep your ABSI in a healthy range as you age, since waist circumference tends to increase naturally with age.

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