How does the Ponderal Index work?

PI = Weight (kg) / Height (m)³ Then: Normal adult range: 11–14 kg/m³ Then: Used in neonates to assess intrauterine growth restriction Then: More appropriate than BMI at extremes of height.

Can you give an example of how to use the Ponderal Index?

Example: Input Weight 68 kg, height 1.72 m gives a result of PI = 68 / 5.088 = 13.4 kg/m³ (Normal).

Is the Ponderal Index free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Ponderal Index?

Our Ponderal Index uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Ponderal Index

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Weight (kg)

Height (cm)

PI = Weight / Height³. Normal range: 11–14 kg/m³.

The Ponderal Index (PI) divides weight by height cubed, making it more scale-independent than BMI for very tall or short individuals. Widely used in neonatal medicine for growth assessment.

Symbol	Name	Unit	Description
Weight	Body weight	kg (or grams for infants)	—
Length	Length / height	cm (or meters)	—
PI	Ponderal index	Unitless (or g/cm³)	—

PI (kg/m³)	Category
< 11	Underweight
11–13	Lean to normal
13–15	Normal to healthy
15–17	Overweight
> 17	Obese

References

›Ponderal index — Wikipedia

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