Body Adiposity Index (BAI) Calculator

Enter your hip circumference and height to estimate your Body Adiposity Index.

Body Adiposity Index (BAI) Calculator

Estimate body fat percentage using the Body Adiposity Index formula, without needing a scale.

This is an estimate for general informational purposes only, not medical advice. BAI was developed and validated primarily on adult Mexican-American and African-American populations, and its accuracy for other populations, athletes, and older adults has been questioned in later research — it is not a substitute for a clinical body composition assessment.

The Body Adiposity Index was developed as a way to estimate body fat percentage using only hip circumference and height, without needing to weigh yourself — useful in settings where a reliable scale is not available.

Example

  • With the default values shown above, this calculator returns: Body Adiposity Index ≈ 27.1%.

Frequently Asked Questions

How is BAI different from BMI?

BMI uses weight and height, while BAI uses hip circumference and height, aiming to directly estimate body fat percentage rather than a general weight-to-height ratio.

Is BAI more accurate than BMI?

Research findings are mixed — some studies have found BAI does not always outperform BMI, especially outside the specific populations it was originally validated on, so it should be treated as one estimate among several rather than a definitive measure.

Sources

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