Does the original ABSI equation use sex or age?

No. Raw ABSI uses waist circumference, BMI, and height. Age and sex may be used in separate reference-population z-score models, but they do not enter the original raw equation calculated here.

Which units does ABSI require?

The published equation uses waist and height in meters and BMI in kg/m². This calculator converts metric or US inputs to kilograms and meters before calculating.

Does ABSI give an individual mortality risk?

No. The original research associated population distributions of ABSI with mortality, but a raw value alone is not an individualized prediction. This page does not apply a risk category or reference-population z-score.

Educational reference only. Not a diagnostic tool. See full disclaimer.

GeneralA Body Shape Index

A Body Shape Index Calculator

Calculate the original raw ABSI research index from height, weight, and waist.

Content updated: July 18, 2026View sources

Unit systemSex (not used in raw ABSI formula)

Height

Weight

Waist circumference

A Body Shape Index (raw ABSI)

—

Original raw research index; no risk category is assigned

BMI used: — kg/m² · sex selection (female) does not enter the equation

About

A Body Shape Index (ABSI) is a research anthropometric index that scales waist circumference for BMI and height. The original equation does not use sex; the optional sex field is shown only to make that limitation explicit and does not change the result.

Formula

BMI = weight (kg) ÷ height² (m²)

ABSI = waist (m) ÷ [BMI^(2/3) × height^(1/2) (m)]

Interpretation

What the result represents: Waist circumference scaled relative to body mass index and height.

Input units: Metric mode uses cm, kg, and cm; US mode uses inches, pounds, and inches. Inputs are converted to meters and kilograms before calculating BMI and ABSI.

Worked example: Height 170 cm, weight 70 kg, and waist 85 cm gives BMI about 24.22 kg/m² and ABSI about 0.07787 m^(11/6)/kg^(2/3).

Applicable population: The original derivation used nonpregnant US adults aged 18 years and older. Pediatric, pregnancy, edema, and unusual body-proportion applications require separate validation.

Interpretation limitations: ABSI is a research index, not imaging or direct body-composition measurement. Age- and sex-standardized z-score systems are separate model versions requiring a defined reference population; this page reports only the original raw ABSI and does not map it to mortality or individual risk.

References

FAQ

Related Calculators

Body Roundness Index

Calculate Body Roundness Index from height and waist circumference.

Waist-to-Height Ratio

Calculate waist-to-height ratio from matched circumference and height units.

BMI

Calculate Body Mass Index from weight and height.

Disclaimer

Educational and informational reference only. Not intended to replace professional medical advice, diagnosis, treatment, or independent verification.