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ABSI Calculator

Health

Calculate your A Body Shape Index (ABSI) from waist circumference, height, and weight to assess abdominal health risk independent of BMI, in seconds.

Reviewed by the thecalcu.com team · Last updated July 25, 2026

Waist Circumference
cm
50180
Height
cm
120220
Weight
kg
30200

Measure your waist at the navel level, standing relaxed. ABSI combines waist circumference, height, and BMI to estimate abdominal health risk independent of overall body size.

A Body Shape Index

0.00000

BMI (for reference)

0.0

✅

Low Risk

Approximate bands: <0.075 low, 0.075–0.079 average, 0.080–0.084 above average, ≥0.085 high

For general guidance only. ABSI is a research-derived screening indicator — consult a healthcare provider for a full assessment.

What is a ABSI?

An ABSI Calculator computes A Body Shape Index, a health metric that combines waist circumference, height, and BMI into a single score designed to capture abdominal fat and its associated health risk more precisely than BMI alone. Developed by researchers Nir and Jesse Krakauer, ABSI addresses a well-known limitation of the BMI Calculator: two people can share an identical BMI while carrying very different amounts of fat around their midsection, and abdominal fat is more strongly linked to cardiovascular and metabolic risk than overall body weight.

This calculator takes your waist circumference, height, and weight, computes your BMI internally, and applies the ABSI formula to give you both figures at once. Because ABSI is expressed relative to your existing BMI, it isolates the "extra" risk contribution from central body fat rather than simply restating your overall size, making it a useful complement to measures like the Waist-to-Hip Ratio Calculator.

Why Use an ABSI Calculator?

Standard weight and BMI tracking can miss a critical piece of the health picture: where your body stores fat. Someone with a "normal" BMI can still carry substantial abdominal fat, a pattern linked in research to elevated cardiovascular and metabolic risk, a limitation ABSI was specifically designed to address. Calculating your ABSI turns three simple measurements into a single, research-backed indicator that flags this risk pattern even when your weight and BMI look unremarkable.

This is especially useful for anyone monitoring long-term health trends rather than just short-term weight changes, since ABSI can shift meaningfully with changes in waist circumference even when total body weight stays relatively stable, the same complementary insight offered by the Body Fat Calculator.

Who Should Use This Calculator?

  • Anyone with a "normal" BMI wanting a deeper risk check, ABSI can reveal abdominal fat risk that BMI alone doesn't capture.
  • People tracking cardiovascular or metabolic risk factors who want a research-derived indicator beyond weight and BMI.
  • Fitness and health coaches monitoring client progress across multiple body composition metrics, including alongside the Ideal Weight Calculator.
  • Anyone making lifestyle changes targeting abdominal fat who wants to quantify progress over time.
  • Health-conscious individuals wanting a quick, formula-based screening check between regular medical visits.

What Insights Does the ABSI Calculator Give You?

The calculator returns two figures that work together to give context to your result:

  • ABSI, the primary score, calculated from your waist circumference, height, and BMI using the Krakauer formula. This is the headline number used to gauge abdominal fat-related risk.
  • BMI, your Body Mass Index, calculated automatically from your height and weight, shown for reference since it's a direct input into the ABSI formula itself.

Because ABSI values are small decimals (typically in the 0.07–0.09 range for most adults), the calculator also maps your score to an approximate risk category, Low, Average, Above Average, or High, so the number is immediately interpretable rather than requiring you to look up population reference tables.

How to use this ABSI calculator

  1. Enter your Waist Circumference in centimeters, measured at navel level while standing relaxed.
  2. Enter your Height in centimeters.
  3. Enter your Weight in kilograms.
  4. Read your ABSI result, shown as the primary figure along with your calculated BMI for reference.
  5. Check the risk category card to see where your ABSI falls relative to approximate population bands.
  6. Review the step-by-step breakdown to see exactly how your BMI and ABSI were calculated from your inputs.

Formula & Methodology

ABSI is calculated in two steps. First, BMI is derived from height and weight:

BMI = Weight (kg) ÷ Height (m)²

Then ABSI applies the Krakauer formula:

ABSI = Waist Circumference (m) ÷ (BMI^(2/3) × √Height (m))

Worked example: for someone with an 85 cm waist, 170 cm height, and 70 kg weight:
- Height = 1.70 m, Waist = 0.85 m
- BMI = 70 ÷ (1.70²) = 24.2
- ABSI = 0.85 ÷ (24.2^(2/3) × √1.70) = 0.0799
- An ABSI of 0.0799 falls in the Average Risk band under this calculator's approximate thresholds.

Approximate risk bands used: below 0.075 Low Risk, 0.075–0.079 Average Risk, 0.080–0.084 Above Average Risk, 0.085 and above High Risk. These bands are approximations for general screening, precise clinical interpretation typically uses population-specific z-scores.

Frequently Asked Questions

A Body Shape Index (ABSI) is a health metric that combines waist circumference, height, and BMI into a single value that estimates abdominal fat and associated health risk. It was developed by researchers Nir and Jesse Krakauer in 2012 as a way to capture risk information that BMI alone misses, since BMI does not account for where fat is distributed on the body.
BMI only measures weight relative to height, so it cannot distinguish between someone carrying weight as muscle versus someone carrying weight as abdominal fat. ABSI factors in waist circumference specifically, making it more sensitive to central (abdominal) fat, which research links more strongly to cardiovascular and metabolic risk than overall body weight.
There is no single universal cutoff, but ABSI values are generally interpreted relative to population z-scores or approximate bands, with lower values indicating lower abdominal fat relative to height and BMI. This calculator applies approximate risk bands, below 0.075 is considered low risk, 0.075–0.079 average, 0.080–0.084 above average, and 0.085 or higher high risk.
Measure your waist at the level of your navel while standing relaxed, without pulling the tape measure tight or holding your breath in. Take the measurement at the end of a normal exhale for consistency, and use a flexible tape measure kept level around your torso.
ABSI = Waist Circumference (in meters) ÷ (BMI^(2/3) × √Height (in meters)). The calculator converts your waist and height inputs to meters, computes your BMI from your weight and height, and then applies this formula to produce your ABSI score.
Several studies suggest ABSI can be a useful complementary indicator to BMI, particularly for identifying abdominal obesity risk in people whose BMI falls in the 'normal' range but who carry excess fat around the waist. However, ABSI is a research-derived screening tool, not a diagnostic measure, and should be used alongside other health indicators rather than in isolation.
Including BMI in the formula allows ABSI to express waist circumference relative to a person's existing weight-for-height baseline, isolating the 'extra' contribution of central fat beyond what BMI alone would predict. This is what allows two people with the same BMI but different waist sizes to get different ABSI scores.
ABSI, like BMI and other anthropometric formulas, is a population-level statistical tool and may be less precise for highly muscular individuals, older adults, or people with atypical body compositions. It works best as one data point in a broader health assessment rather than a standalone diagnosis.
Yes, tracking ABSI periodically, such as monthly or quarterly, can help you see trends in abdominal fat distribution that might not show up as clearly on a bathroom scale or even in your BMI. A downward trend in ABSI alongside other healthy habits generally suggests improving abdominal health risk.
Both ABSI and the [Waist-to-Hip Ratio Calculator](/waist-hip-ratio-calculator/) focus on abdominal fat distribution rather than overall body size, but ABSI additionally normalizes for BMI and height using a specific mathematical formula, while WHR is a simple ratio of two circumference measurements. Many people check both alongside their [BMI Calculator](/bmi-calculator/) result for a fuller picture.
A high ABSI score is a signal to discuss abdominal fat and cardiovascular risk factors with a healthcare provider, not a diagnosis on its own. Lifestyle changes such as increased physical activity, dietary adjustments, and reducing waist circumference over time are commonly recommended approaches, alongside monitoring other markers like the [Body Fat Calculator](/body-fat-calculator/) result.
No, you only need a flexible tape measure to record your waist circumference and a way to measure your height and weight, which most people can do at home. This calculator handles the BMI calculation and the ABSI formula automatically once you enter those three measurements.
Also known as
A Body Shape Index calculatorABSIbody shape indexabdominal risk calculatorABSI score