Broca Index Calculator

Broca Index Calculator for Endocrinology. This is a historical reference, not a recommended target or a modern comprehensive assessment of body composition and health. The tool deliberately returns neutral arithmetic.

For shared guidance on choosing a tool and documenting results, read the clinical calculator workflow.

How this calculator works

The original Broca arithmetic reference subtracts 100 from height in centimeters to obtain a weight in kilograms. Later modified formulas use additional factors; those are not silently included here.

When to use this calculator

Understand an older clinical worksheet or compare historical body-size conventions. Identify the exact formula before interpreting a number called Broca, since modified versions produce different answers.

Inputs used

  • Adult height above 100 cm

Clinical interpretation

This is a historical reference, not a recommended target or a modern comprehensive assessment of body composition and health. The tool deliberately returns neutral arithmetic.

Worked example

At 170 cm the original reference is 70 kg. At 180 cm it is 80 kg. Applying an additional 0.9 factor would instead give 72 kg at 180 cm, which is a different formula, not a rounding choice.

Limitations and safety notes

Age, sex, muscle mass and adipose distribution are absent. The cited comparison study supplies the formula definition but does not justify making it a universal dosing or weight-management standard.

Frequently asked questions

Does the result account for sex?

No. The original height-minus-100 version is identical for both sexes; later modified equations must be separately named.

References

  • https://doi.org/10.15761/jcis.1000105

Editorial review and citation methodology

Maintained by the Quick Medical Calculator Editorial Team. Content record date: September 9, 2026. A content date is not evidence of independent clinical review. Individual clinical sign-off is not recorded on this page.

  • Prefer original validation studies for scoring systems and prediction tools.
  • Use current specialty society guidance, transplant allocation policy, public health guidance, or regulator resources when they govern clinical use.
  • Include limitations and safety notes when a calculator is population-specific, context-dependent, or unsuitable as a standalone decision tool.

Related reviewed calculators