Body Metrics & Fitness6 options compared

BAI Calculator - Body Adiposity Index

This free comparison calculator includes a full BAI computation component alongside BMI, using hip circumference and height inputs for BAI. It provides the BAI formula, output ranges, and context notes to help users understand the estimate. The tool is publicly accessible and usable without a required paid plan.

Body measurements calculators
Editors’ Top PickBased on community votes
Other OptionsRanked by votes
  1. Screenshot of Omni Calculator
    02
    Omni Calculator
    omnicalculator.com

    Are you curious how much fat your body contain? Or maybe you are concerned that you have too much of it? Find your he...

    Open siteView details
  3. Screenshot of MDApp
    04
    MDApp
    mdapp.co

    This free BAI calculator estimates body fat percentage from hip circumference and height using the standard BAI formu...

    Open siteView details
  4. Screenshot of ShapeSense
    05
    ShapeSense
    shapesense.com

    ShapeSense offers a dedicated, free Body Adiposity Index calculator focused on estimating body fat percentage from hi...

    Open siteView details
  5. Screenshot of ThinkCalculator
    06
    ThinkCalculator
    thinkcalculator.com

    ThinkCalculator includes a free Body Adiposity Index tool that computes BAI from hip circumference and height. It sho...

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Side by side

BAI Calculator - Body Adiposity Index options compared

ToolBest forStrengthsLimitations
Calculator Academy
calculator.academy
Quick BAI with unit flexibility
  • Shows formula and calculation steps
  • Hip and height in cm or inches
  • Free, no account needed
  • Fewer interpretation categories than some rivals
Omni Calculator
omnicalculator.com
BAI with health context and ranges
  • Writes out BAI categories (underweight/healthy/overweight/obese)
  • Links to supporting article on body fat percentage
  • High community votes (5)
  • Adds a disclaimer that it is not medical advice
  • Less focus on the raw formula steps
Interactive Mathematics (IntMath)
intmath.com
BAI vs. BMI side-by-side comparison
  • Compares BAI and BMI using same hip/height inputs
  • Publicly accessible without paid plan
  • Live page excerpt could not be fetched, so details are thin
MDApp
mdapp.co
BAI with age/sex interpretation tables
  • Includes interpretation ranges by age and sex
  • Explains research and limitations behind BAI
  • Free to use on page
  • Live page excerpt could not be fetched, so details are thin
ShapeSense
shapesense.com
BAI with gender-specific classification tables
  • BAI classification tables for men and women by age group
  • Explains the equation used
  • Publicly accessible with no subscription
  • Live page excerpt could not be fetched, so details are thin
ThinkCalculator
thinkcalculator.com
Simple BAI with visual guide and example
  • Shows formula clearly with example calculation
  • Hip/c height in cm, inches, meters, feet
  • Free, no payment required
  • Fewer interpretation categories; basic visualization only

Buyer's guide

How to choose a bai calculator - body adiposity index

When picking a BAI calculator, the most important thing is whether the tool shows the actual formula and lets you enter hip circumference and height in the units you have on hand (cm vs. inches). If you want to understand what the number means, look for a calculator that includes interpretation ranges — some label results as underweight, healthy, overweight, or obese, and a few break those down by age or sex. If you just need a quick estimate, a minimal calculator that does the math and displays the result is enough; if you want context, choose one that also explains the formula’s background and limitations.

Questions

BAI Calculator - Body Adiposity Index FAQ

What is Body Adiposity Index and how is it different from BMI?
BAI is calculated as hip circumference divided by height to the power of 1.5, then subtract 18. The formula is BAI = (Hip Circumference / Height^1.5) - 18, where hip circumference is in centimeters and height is in meters.
Do I need to measure my hip circumference in centimeters or inches?
Most BAI calculators accept both centimeters and inches; just make sure the tool you use matches the units you entered, since the formula expects hip circumference in centimeters and height in meters.
What BAI range is considered healthy?
The supporting articles for these calculators typically label ranges as underweight, healthy, overweight, and obese. Exact cutoff values vary slightly by source, but a BAI between about 21% and 33% is commonly cited as the healthy range for most adults.
Can BAI replace a doctor’s body fat measurement?
No. These calculators provide estimates based on body measurements only. For a professional assessment, consult a healthcare provider who can use more accurate methods such as dual-energy X-ray absorptiometry or skinfold calipers.
Why do some BAI calculators show age‑ or sex‑specific categories?
Research suggests that body fat distribution differs by age and sex, so some tools include classification tables that adjust the healthy ranges accordingly. If those details matter to you, look for a calculator that offers age‑ or sex‑specific interpretation.
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