Abdominal Volume Index Calculator
The Abdominal Volume Index (AVI) estimates the volume of your abdomen from your waist and hip circumferences, giving a measure of central (belly) fat linked to metabolic risk. Enter your waist and hip in centimetres and the calculator returns your AVI and a rough interpretation. It is a screening estimate of abdominal obesity, not a diagnosis.
- Geometric approximation; thresholds are study-dependent.
Formula
AVI = (2 × waist² + 0.7 × (waist − hip)²) / 1000 (cm)
- AVI = (2 × waist² + 0.7 × (waist − hip)²) ÷ 1000, with waist and hip in centimetres.
- It models the abdomen as an ellipse, so a larger waist relative to hips raises the index.
- As a rough guide, higher AVI means more central fat; values around 20 and above indicate high abdominal volume.
- AVI complements waist circumference and waist-to-hip ratio as a marker of central obesity.
- Thresholds vary between studies and populations, so use the result as a screening estimate, not a diagnosis.
Example Calculation
Inputs
- Waist: 90 cm
- Hip: 100 cm
With a waist of 90 cm and hips of 100 cm, AVI = (2 × 90² + 0.7 × (90 − 100)²) ÷ 1000 = (16,200 + 70) ÷ 1000 ≈ 16.3, which falls in the moderate abdominal-volume range.
Frequently asked questions
What is the Abdominal Volume Index?
It is a measure of abdominal (central) fat estimated from your waist and hip circumferences, used as a screening marker of obesity-related metabolic risk.
How do I measure waist and hip?
Measure the waist at the navel level and the hips at their widest point, keeping the tape snug and level. Use centimetres.
What is a high AVI?
Roughly, values around 20 or more suggest high abdominal volume, 15 to 20 moderate, and below 15 lower. Cut-offs differ between studies.
How is AVI different from BMI?
BMI uses height and weight and cannot tell where fat sits. AVI focuses on the abdomen, so it better reflects central fat linked to heart and metabolic risk.
Does a high AVI mean I have a disease?
No. It is a screening estimate. A high value is a prompt to look at your overall risk with a healthcare professional, not a diagnosis.
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