Calculate your Abdominal Volume Index from waist and hip circumference. AVI provides a geometric abdominal-volume estimate from tape-measure inputs.
The Abdominal Volume Index (AVI) estimates abdominal volume from waist and hip circumference using a published geometric formula. It was developed by Guerrero-Romero and Rodríguez-Morán as a practical anthropometric estimate of abdominal size, but it remains an estimate rather than an imaging measurement.
The formula models the trunk with a simple volume approximation. In validation studies, AVI has been associated with central-adiposity and metabolic-risk markers, so it is useful as a screening reference rather than a diagnosis or treatment rule.
AVI combines waist and hip measurements into a single volumetric metric. That makes it a helpful companion to waist circumference or waist-to-hip ratio when you want a simple estimate of abdominal size from a tape measure.
AVI gives a simple abdominal-volume estimate from two tape-measure measurements. It is useful when you want a quick reference for central adiposity without using a scale or height measurement, and it can be read alongside other anthropometric measures rather than treated as a stand-alone risk label.
Abdominal Volume Index (AVI) = (2 × Waist² + 0.7 × (Waist − Hip)²) / 1000 Where Waist and Hip are in centimeters. The index approximates the volume (in liters) of an elliptical cylinder representing the abdomen. Higher values indicate greater abdominal volume. General reference bands: • AVI < 13: Lower reference band • AVI 13–17: Intermediate reference band • AVI > 17: Higher reference band
Result: AVI = 18.07
With a waist of 95 cm and hip of 100 cm: AVI = (2 × 95² + 0.7 × (95 − 100)²) / 1000 = (2 × 9025 + 0.7 × 25) / 1000 = (18050 + 17.5) / 1000 = 18.07. This is above the common upper reference band, so it suggests greater central adiposity than a lower AVI value would.
Most anthropometric indicators of abdominal obesity — waist circumference, waist-to-hip ratio, waist-to-height ratio — are one-dimensional or ratio-based. The Abdominal Volume Index takes a different approach by estimating a three-dimensional volume. This is conceptually closer to what imaging techniques measure and may therefore better reflect the physiological reality of abdominal fat accumulation.
Studies comparing AVI to CT and MRI volumetric assessments of abdominal fat have reported useful correlations, but AVI remains a surrogate estimate rather than a direct scan. In population screening settings where imaging every participant is impractical, AVI can still be a practical low-cost reference.
Metabolic syndrome — defined by the co-occurrence of central obesity, elevated triglycerides, low HDL cholesterol, hypertension, and high fasting glucose — affects a large share of adults worldwide. AVI has been studied as one of several anthropometric markers associated with those patterns, making it a practical addition to broader screening protocols.
AVI requires only a tape measure and basic arithmetic, making it useful in community health screenings, school health programs, and resource-limited clinical settings. Training a non-specialist to measure waist and hip circumference accurately takes minutes, and the calculation can be done on any basic calculator or smartphone.
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This page calculates AVI with the published formula AVI = [2 × waist² + 0.7 × (waist − hip)²] / 1000 using waist and hip in centimeters. The result is presented as a geometric estimate of abdominal volume, and the common 13 and 17 cut-points are shown only as broad reference bands. The calculator does not claim to measure visceral fat directly or diagnose metabolic syndrome.
The AVI is an anthropometric measure that estimates the volume of abdominal fat using waist and hip circumference measurements. It models the abdomen as an elliptical cylinder and produces a value in approximate liters of abdominal volume. Higher values indicate greater abdominal fat accumulation.
AVI values above approximately 17 are associated with elevated central-adiposity and metabolic-risk patterns in some studies. Values between 13 and 17 indicate an intermediate reference band, and values below 13 are generally considered lower. Exact thresholds may vary by study population.
Waist-to-hip ratio (WHR) is a simple division yielding a dimensionless number. AVI uses both measurements in a volumetric formula that accounts for the difference between waist and hip sizes, producing a value that approximates abdominal volume. AVI has been studied alongside imaging-based abdominal-fat measures in some populations.
No. AVI uses only waist and hip circumference, making it simple to measure. This is an advantage in field settings or when scales and stadiometers are unavailable. For a complete health assessment, combining AVI with BMI or other metrics can provide more context.
AVI estimates total abdominal volume, which includes both visceral and subcutaneous abdominal fat. It cannot distinguish between the two. For specific visceral fat quantification, imaging methods such as CT, MRI, or DEXA are needed.
AVI has been studied in several populations, including Mexican, Brazilian, and European cohorts. Population-specific cut-offs may differ, so the numbers are best treated as reference bands rather than universal diagnostic thresholds.
Monthly measurements are sufficient for tracking trends. More frequent measurements may introduce noise due to daily fluctuations in hydration and abdominal distension. Always measure under the same conditions for best comparability.
Yes. Aerobic exercise can reduce abdominal fat and waist circumference even without significant scale changes, because muscle mass may increase while fat decreases. That would lower AVI while total body weight remains stable.