Question 1

What is a Ponderal Index?

Accepted Answer

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.

Question 2

How does the Ponderal Index work?

Accepted Answer

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.

Question 3

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

Accepted Answer

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

Question 4

Is the Ponderal Index free to use?

Accepted Answer

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

Question 5

How accurate is the Ponderal Index?

Accepted Answer

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.

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

Ponderal Index

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