Health

Ponderal Index Calculator

Calculate your Ponderal Index (Corpulence Index) from height and weight. A height-cubed alternative to BMI that is more reliable at extremes of stature.

Ponderal Index Calculator

Height (cm)

Weight (kg)

Method

How this calculator works

Ponderal Index (PI) = weight (kg) ÷ height (m)³, where height in meters = height in cm ÷ 100. A normal adult range is roughly 11–14 kg/m³.

Enter your height in centimeters.
Enter your weight in kilograms.
The calculator converts height to meters (cm ÷ 100) and cubes it.
It divides your weight by height cubed to produce the Ponderal Index in kg/m³.

Examples

Worked examples

Real numbers, end-to-end results.

Height 175 cm, Weight 70 kg

PI = 13.1 kg/m³

Within the typical adult range of 11–14.

Height 160 cm, Weight 50 kg

PI = 12.2 kg/m³

Normal leanness relative to height.

Use cases

When to use it

Assessing leanness for very tall or very short adults where BMI can mislead
Neonatal and pediatric growth assessment
Tracking body composition trends alongside BMI
Sports and clinical screening where height-independent metrics are preferred

Disclaimer: This calculator provides estimates for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider for decisions affecting your health. Results depend on the accuracy of inputs provided.

FAQ

Frequently asked questions

What is the Ponderal Index?

The Ponderal Index (PI), also called the Corpulence Index, measures leanness relative to height. Unlike BMI, it divides weight by height cubed, which makes it more consistent across people of very different heights.

What is a normal Ponderal Index for adults?

For adults, a Ponderal Index of roughly 11 to 14 kg/m³ is generally considered normal. Values below this range may indicate underweight, and values above it may indicate excess weight.

How is the Ponderal Index different from BMI?

BMI divides weight by height squared, while the Ponderal Index divides weight by height cubed. Because body mass tends to scale with the cube of height, PI is less biased for very tall or very short individuals than BMI.

Is the Ponderal Index used for babies?

Yes. The Ponderal Index is widely used in neonatal medicine to assess whether a newborn's weight is appropriate for their length and to help identify growth restriction.

Can the Ponderal Index replace BMI?

PI is a useful complement rather than a full replacement. It is especially helpful at the extremes of height, but BMI remains the most widely referenced screening measure in general adult health.