Katz Index of ADL Calculator

Katz Index of ADL Calculator for Geriatrics. Changes should be checked against the underlying activities and circumstances. A rise from 4 to 5 is one more point on this version, not a universal proportional gain in independence.

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

How this calculator works

This entry page uses the 0-6 version, with higher totals indicating greater independence in the assessed basic activities. Source version: https://www.bgs.org.uk/sites/default/files/content/attachment/2018-07-05/katz_adl.pdf.

When to use this calculator

Communicate a completed basic-function assessment alongside the actual care plan. Do not mix letter-classified Katz variants with this numeric version.

Inputs used

  • Final 0-6 Katz total
  • Version and observed assistance context

Clinical interpretation

Changes should be checked against the underlying activities and circumstances. A rise from 4 to 5 is one more point on this version, not a universal proportional gain in independence.

Worked example

A source assessment yields 4/6. The page records 4; it does not label the person 66.7% independent. Two people with 4 can need assistance with different activities and therefore require different arrangements.

Limitations and safety notes

The total is not a full assessment of cognition, instrumental daily tasks or safe living arrangements. No item text or scoring descriptors are reproduced. The score-entry page cannot verify how the source assessment was performed.

Frequently asked questions

Is 4.5 an acceptable total?

No. This version accepts integers only. Recheck the source rather than averaging two observers' totals.

References

  • British Geriatrics Society hosted Katz source version. https://www.bgs.org.uk/sites/default/files/content/attachment/2018-07-05/katz_adl.pdf

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.

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