A Body Shape Index Calculator

Measure waist circumference in centimeters at the natural waist line
Enter height in centimeters
Enter weight in kilograms
Health

A Body Shape Index (ABSI) combines your waist circumference with your BMI and height to judge how much of your weight sits around the middle. Enter your waist, height and weight and the calculator returns your ABSI, your BMI, and a rough risk band. A higher ABSI means more central fat for your size, which is linked to greater health risk independent of BMI.

Formula

ABSI = Waist / (BMI^(2/3) × √Height)
  • ABSI = waist (m) ÷ (BMI^(2/3) × height (m)^(1/2)), with BMI from weight and height.
  • By dividing out BMI and height, ABSI isolates how central your fat is, rather than overall size.
  • A higher ABSI means a larger waist than expected for your BMI and height — greater central obesity.
  • ABSI predicts health risk independently of BMI, so a normal-BMI person can still have a high ABSI.
  • The risk bands here are approximate; published thresholds use population averages and vary by age and sex.

Example Calculation

Inputs
  • Waist Circumference: 85
  • Height: 170
  • Weight: 70

With a waist of 85 cm, height 170 cm and weight 70 kg, BMI is about 24.2. ABSI = 0.85 ÷ (24.2^(2/3) × 1.70^(1/2)) ≈ 0.078, which falls in the lower-risk range.

Frequently asked questions

What is A Body Shape Index?
ABSI is a measure of central fat that combines waist circumference with BMI and height, so it reflects body shape rather than just size.
Why use ABSI instead of just BMI?
BMI cannot show where fat is stored. ABSI highlights waist size relative to body, and it predicts health risk even when BMI is in the normal range.
What counts as a high ABSI?
Higher values mean more central fat for your size. Exact cut-offs depend on age and sex, so compare against population-based references rather than a single number.
How do I measure my waist?
Measure around the natural waistline, roughly at the navel, with the tape snug and level and after a normal exhale.
Is a high ABSI dangerous?
It signals higher risk linked to central obesity, but it is a screening estimate. Discuss your overall risk with a healthcare professional.