Ponderal Index Calculator

Your details

Adults use kg/m³ with a typical band of 11 to 15. Newborns use g/cm³ with a typical band of 2.2 to 3.0.
Body weight, kilograms in metric, pounds in imperial.
kg
Height in centimetres (metric) or inches (imperial). For a newborn this is the crown to heel length.
cm
The reciprocal ponderal index is height divided by the cube root of weight, the form used in some clinical references.
Ponderal IndexTypical / healthy range
13.1kg/m³

Mass relative to height cubed

Reciprocal index (RPI)42.46cm/kg⅓
BMI (for comparison)22.9kg/m²
13.1 kg/m³
Below<11Healthy11-15Above15-17High17+

Your Ponderal Index is 13.1 kg/m³, within the typical healthy band.

  • Unlike BMI, the Ponderal Index divides by height cubed, so it stays steadier across very tall and very short people of the same build.
  • A roughly 11 to 15 kg/m³ range is commonly cited as typical for healthy adults, though no single body has fixed official cut-offs the way the WHO has for BMI.
  • It is a screening number, not a diagnosis: it cannot tell muscle from fat or show where weight is carried.
  • Your reciprocal index (RPI) is 42.46 cm/kg⅓, the inverted form some clinical papers use, where a higher number means a leaner build.

Next stepCompare it with your BMI above, if the two disagree, your height is probably stretching one of the indices, and a waist-based or body-fat measure will clarify the picture.

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