Katz ADL Index Calculator — Free Functional Assessment

Katz Index of Independence (ADL) Calculator — Basic Functional Status Assessment

Score all 6 basic Activities of Daily Living — Bathing, Dressing, Toileting, Transferring, Continence, and Feeding — with complete independence and dependence criteria. Classifies functional status from fully independent (6) to fully dependent (0) with EMR-ready SOAP documentation.

NMClinically reviewed byNikhil Mahajan, PT, MPT · Aug 15, 2026

What Is the Katz Index of Independence in ADL?

A 78-year-old man is admitted to a rehabilitation unit following a left total hip replacement. His surgical team needs to document his pre-morbid functional status to set realistic discharge goals — specifically, whether he was independent in bathing and transferring before surgery, or whether he needed assistance. Without an objective baseline, the rehab team cannot meaningfully measure recovery or justify the level of post-discharge support he will need.

The Katz Index of Independence in Activities of Daily Living (Katz ADL) is the most widely used standardised measure of basic functional status in older adults. Developed by Sidney Katz and colleagues at the Benjamin Rose Hospital in Cleveland, Ohio and published in JAMA in 1963, it evaluates independence in six basic self-care activities: Bathing, Dressing, Toileting, Transferring, Continence, and Feeding. Each activity is scored as Independent (1) or Dependent (0) for a maximum of 6 points. For a comprehensive functional picture, the Katz ADL should be paired with the Lawton IADL Scale, which assesses more complex instrumental activities required for independent community living.

How to Score the Katz ADL — Interpretation Guide

Each of the six activities is scored as either Independent (1 point) or Dependent (0 points). The maximum score of 6 indicates full independence across all basic self-care tasks. The minimum score of 0 indicates complete dependence in all six activities.

Katz Score	Classification	Functional Description	Care Implications
6	Fully Independent	Independent in all 6 basic ADLs	Community living; independent home care
5	Mildly Impaired	Dependent in 1 ADL only	Minimal home assistance; monitoring recommended
4	Mild–Moderate	Dependent in 2 ADLs	Home care services; occupational therapy evaluation
3	Moderate	Dependent in 3 ADLs	Assisted living or significant home support
2	Moderate–Severe	Dependent in 4 ADLs	Skilled nursing or comprehensive home care
1	Severely Dependent	Dependent in 5 ADLs	Skilled nursing facility strongly indicated
0	Fully Dependent	Dependent in all 6 ADLs	24-hour nursing care required

Clinical Significance of the Katz ADL

The Katz ADL is grounded in a key observational finding: the six basic ADLs follow a hierarchical pattern of loss and recovery. Bathing is typically the first ADL lost during illness or functional decline and the last to be regained during rehabilitation. Feeding is typically the last lost and first regained. This hierarchy is not arbitrary — it reflects the underlying neuromuscular and cognitive complexity of each task. A patient who retains independence in bathing is almost always independent in the other five ADLs. A patient dependent in feeding is almost always dependent in all six.

This hierarchical property makes the Katz score both a snapshot of current function and a predictor of recovery trajectory. Research by Covinsky et al. (2003) demonstrated that ADL function at hospital discharge — not admission diagnosis — was the strongest predictor of nursing home placement at one year. Patients discharged with Katz scores of 3 or below had significantly higher rates of institutional care placement and 30-day readmission compared to those discharged at Katz 5 or 6.

When to Use This Calculator

The Katz ADL is indicated across a wide range of clinical settings:

Hospital admission — documents pre-morbid functional status for discharge planning and rehabilitation goal-setting
Skilled nursing facility admission — required as part of the Minimum Data Set (MDS 3.0) for all Medicare and Medicaid residents
Medicare home health eligibility — documents ADL dependence required for home care benefit qualification under Medicare Part A
Rehabilitation progress monitoring — serial Katz scores track functional recovery in PT/OT programs after hip fracture, stroke, or major surgery
Pre-operative assessment — baseline ADL function in older surgical patients predicts post-operative recovery and discharge destination
Annual geriatric assessment — year-over-year Katz score changes identify patients experiencing gradual functional decline before a crisis occurs

Minimal Clinically Important Difference (MCID)

The Katz ADL does not have a formally published MCID in the same manner as performance-based outcome measures. However, given its 7-point ordinal scale (0–6), a change of 1 point (gain or loss of independence in one ADL) is considered clinically meaningful — it typically signals a change in care level requirement and warrants care plan reassessment. A change of 2 or more points in either direction represents a substantial functional shift requiring immediate clinical review and potential modification of the discharge plan or level of care.

Clinical Perspective: Functional Assessment in Geriatric Practice

Functional status — the ability to perform activities necessary for self-care and independent living — is now widely recognised as a vital sign in geriatric medicine. Unlike traditional vital signs that measure physiological parameters, functional status reflects the integrated output of multiple organ systems, cognitive function, motivation, and environmental context simultaneously. A decline in ADL function is often the earliest observable signal of a deteriorating underlying condition, preceding measurable changes in laboratory or radiological parameters.

The Katz ADL Index captures this signal at its most fundamental level. The six activities it measures are not arbitrary — they were selected because they represent the minimum threshold of physical capability required for survival without constant assistance. Loss of independence in even a single ADL substantially increases caregiver burden, healthcare utilisation, and the probability of institutional placement over a 12-month horizon.

Clinical observation across geriatric inpatient and outpatient settings consistently confirms that ADL functional status at hospital discharge is more predictive of long-term outcomes than the acute diagnosis that prompted admission. A patient admitted with pneumonia who was Katz 6 before admission and discharges at Katz 4 carries a meaningfully different prognosis for 30-day readmission and one-year survival than their admission diagnosis alone would suggest. This is why documenting pre-morbid Katz ADL function on admission — not just current function — is a standard requirement in comprehensive geriatric assessment protocols.

The hierarchical structure of the Katz ADL also carries practical clinical value that is often underutilised. When a patient's Katz score does not follow the expected hierarchical pattern — for example, a patient who is independent in bathing but dependent in feeding — this should prompt further clinical investigation. Non-hierarchical loss patterns may indicate a specific localised impairment (neurological, musculoskeletal, or cognitive) that a global functional score alone would not detect and that warrants targeted assessment.

Written by Nikhil Mahajan, PT, MPT · Clinically reviewed August 15, 2026 · MedicalCalculatorHub

Katz ADL Index — Score Interpretation Reference

Katz Score

Classification

Functional Description

Care Implications

Fully Independent

Independent in all 6 basic ADLs

Community living; independent home care

Mildly Impaired

Dependent in 1 ADL only

Minimal home assistance; monitoring recommended

Mild–Moderate

Dependent in 2 ADLs

Home care services; occupational therapy evaluation

Moderate

Dependent in 3 ADLs

Assisted living or significant home support

Moderate–Severe

Dependent in 4 ADLs

Skilled nursing or comprehensive home care

Severely Dependent

Dependent in 5 ADLs

Skilled nursing facility strongly indicated

Fully Dependent

Dependent in all 6 ADLs

24-hour nursing care required

Frequently Asked Questions — Katz ADL Index

What does a Katz ADL score of 4 mean?

A Katz ADL score of 4 means the patient is independent in 4 of the 6 basic ADLs and dependent in 2. This indicates mild-to-moderate functional impairment. Patients at this level typically need some home care assistance and benefit from occupational therapy evaluation to identify adaptive equipment and environmental modifications that could improve independence. Assisted living or home care services are commonly appropriate at this level.

What are the 6 activities in the Katz ADL Index?

The six activities are: (1) Bathing — sponge bath, tub bath, or shower; (2) Dressing — getting clothes and putting them on; (3) Toileting — going to toilet, cleaning self, arranging clothes; (4) Transferring — moving in and out of bed or chair; (5) Continence — bladder and bowel control; (6) Feeding — getting food from plate to mouth. Each is scored as Independent (1) or Dependent (0). Maximum score is 6 (fully independent).

What is the difference between Katz ADL and Barthel Index?

Both assess basic ADL function but differ in scope and scoring. The Katz ADL has 6 items scored dichotomously (0 or 1, maximum 6) — simpler and faster, validated primarily in community-dwelling older adults and nursing home populations. The Barthel Index has 10 items scored on graduated scales (maximum 100) — more granular and better suited for measuring recovery in stroke and rehabilitation settings. The Katz ADL is the standard for geriatric functional assessment; the Barthel Index is the standard for stroke and inpatient rehabilitation.

Why does the Katz ADL follow a hierarchical order?

Katz and colleagues observed that the 6 ADLs are lost and regained in a consistent hierarchical sequence. Bathing is typically the first ADL lost and the last regained after illness or injury. Feeding is typically the last lost and first regained. This hierarchy reflects underlying neurological and musculoskeletal patterns of functional decline. It means a patient independent in bathing is almost always independent in the other 5 ADLs, while a patient dependent in feeding is almost always dependent in all 6. This hierarchy makes the Katz score a reliable predictor of recovery trajectory and overall functional status.

Is the Katz ADL required for Medicare documentation?

Yes. The Katz ADL is embedded in the Minimum Data Set (MDS 3.0), which is required for all Medicare and Medicaid residents in skilled nursing facilities. ADL function is also a key determinant for Medicare home health benefit eligibility — patients must demonstrate dependence in at least one ADL to qualify for skilled home care services under Medicare Part A. Accurate Katz ADL documentation supports both reimbursement and care planning.

How is the Katz ADL different from the Lawton IADL Scale?

The Katz ADL measures basic self-care activities that are fundamental for physical survival — bathing, dressing, toileting, transferring, continence, and feeding. The Lawton IADL Scale measures instrumental activities required for independent community living — using a telephone, managing finances, medication management, transportation, housekeeping, meal preparation, shopping, and laundry. Use both together for a complete functional picture: the Katz identifies who needs physical care support; the Lawton identifies who can live independently at home.

Can the Katz ADL be used to predict hospital readmission?

Yes. Multiple studies have confirmed that Katz ADL score at hospital admission is a significant predictor of 30-day readmission risk, length of stay, and discharge destination. Patients with Katz scores of 3 or below at admission are significantly more likely to require skilled nursing facility discharge rather than home discharge, and are at higher risk of 30-day readmission. Documenting baseline pre-morbid ADL function on admission provides the clinically relevant comparison point for discharge planning.

References

1. Katz S, Ford AB, Moskowitz RW, Jackson BA, Jaffe MW.
Studies of illness in the aged. The index of ADL: a standardized measure of biological and psychosocial function.
JAMA. 1963;185(12):914–919.
PubMed: 14044222

2. Covinsky KE, Palmer RM, Fortinsky RH, et al.
Loss of independence in activities of daily living in older adults hospitalized with medical illnesses.
Journal of the American Geriatrics Society. 2003;51(4):451–458.
PubMed: 12657063

3. Shelkey M, Wallace M.
Katz Index of Independence in Activities of Daily Living (ADL). Try This: Best Practices in Nursing Care to Older Adults.
Hartford Institute for Geriatric Nursing. 2012;2.
ConsultGeri: Issue 2

4. Graf C.
The Lawton Instrumental Activities of Daily Living Scale.
American Journal of Nursing. 2008;108(4):52–62.
PubMed: 18367931

The Katz ADL Index is in the public domain. No licensing or copyright permission is required for clinical or research use.