Body Adiposity Index Calculator

Estimate body fat from hip size and height with the body adiposity index (BAI).

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Units

Sex

Age

years

Height

Height (feet)

Inches

Hip circumference

Enter your values to see the result.

These results are estimates for general information, not medical advice. Body shape, muscle mass, age, ethnicity and health conditions all affect what is right for you, so talk to a doctor or dietitian before making health decisions.

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How this calculation works

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Formula: BAI = hip circumference(cm) / height(m)^1.5 − 18.
Variables: Units: Metric, Imperial
Sex: Male, Female
Age
Height
Height (feet)
Inches
Hip circumference
Hip circumference
Units: Age: years
Height: cm
Height (feet): ft
Inches: in
Hip circumference: cm
Hip circumference: in
Example: A woman who is 175 cm tall with 98 cm hips has a BAI of about 24.3%, inside the healthy range of 21–33% for women aged 20 to 39.
Assumptions: These results are estimates for general information, not medical advice. Body shape, muscle mass, age, ethnicity and health conditions all affect what is right for you, so talk to a doctor or dietitian before making health decisions.
Source: ToolzHive calculation guide and calculator implementation. External reference verification is pending.
Last reviewed: Review date not yet recorded.

Methodology & References

The method depends on the selected model and input options. Review the assumptions and references above before interpreting the result.

Choose your units and select your sex.
Enter your age, height and hip circumference, measured at the widest part of your buttocks.
Read your BAI and see whether it falls within the healthy range for your age.

Interpretation and limitations

Is BAI more accurate than BMI? BAI estimates body fat directly and does not need a scale, but studies show it is not consistently more accurate than BMI. It works best as one measure among several.
Who should not rely on BAI? It is less accurate for very lean or very muscular people, older adults and children, because it was developed from specific adult populations.
What is a healthy BAI? Healthy ranges rise slightly with age. For ages 20–39 they are about 8–21% for men and 21–33% for women.

References

External reference verification is pending. The formula and examples describe the current ToolzHive implementation.

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How to use the Body Adiposity Index Calculator

The body adiposity index (BAI) estimates body fat percentage without weighing you. Developed by Bergman and colleagues in 2011, it uses only your hip circumference and height: BAI = hip (cm) ÷ height (m)^1.5 − 18. This calculator shows your BAI and compares it with the healthy ranges for your age group and sex.

1 Choose your units and select your sex.
2 Enter your age, height and hip circumference, measured at the widest part of your buttocks.
3 Read your BAI and see whether it falls within the healthy range for your age.

Example and practical tips

A woman who is 175 cm tall with 98 cm hips has a BAI of about 24.3%, inside the healthy range of 21–33% for women aged 20 to 39.

Frequently asked questions

Is BAI more accurate than BMI?

BAI estimates body fat directly and does not need a scale, but studies show it is not consistently more accurate than BMI. It works best as one measure among several.

Who should not rely on BAI?

It is less accurate for very lean or very muscular people, older adults and children, because it was developed from specific adult populations.

What is a healthy BAI?

Healthy ranges rise slightly with age. For ages 20–39 they are about 8–21% for men and 21–33% for women.

How to Use Body Adiposity Index Calculator
Estimate your body fat percentage from hip size and height with the body adiposity index (BAI), and compare it with healthy ranges for your age and sex.