Cardiopulmonary Function Assessment Scores (CPET)

6 Minute Walk Test (6MWT) Calculator

Clinical calculation support · Verify results before clinical use

Patient measurements

Enter the patient's characteristics and the total distance walked during a standardized six-minute test.

6Minutes

Sex used by reference equation Select the category corresponding to the chosen reference equation.

Age (years)

Height (cm)

Weight (kg)

Distance walked (meters) Enter the total measured distance at six minutes, not the predicted distance.

About the 6-Minute Walk Test

The 6-minute walk test (6MWT) measures the distance a patient can walk on a flat surface in six minutes. It is a submaximal functional assessment that reflects the integrated response of cardiovascular, pulmonary, circulatory, and musculoskeletal systems.

This calculator estimates expected distance and the lower limit of normal using the sex-specific equations published by Enright and Sherrill for healthy adults. Their study included 117 men and 173 women aged 40–80 years; the equations explained approximately 40% of the variability in walking distance.

Reference equations

Equation	Predicted 6MWD	LLN
Male	(7.57 × height cm) − (5.02 × age) − (1.76 × weight kg) − 309	Predicted − 153 m
Female	(2.11 × height cm) − (2.29 × weight kg) − (5.78 × age) + 667	Predicted − 139 m

How to interpret the output

Expected 6MWD: estimated distance from the selected reference equation.
LLN: the equation's lower reference boundary, calculated by subtracting the sex-specific constant from predicted distance.
Percent predicted: measured distance divided by predicted distance, multiplied by 100.
Below LLN: indicates the measured distance is below this reference boundary; it does not by itself establish a diagnosis or determine prognosis.

References

Enright PL, Sherrill DL. Reference equations for the six-minute walk in healthy adults. Am J Respir Crit Care Med. 1998;158(5 Pt 1):1384–1387. PMID: 9817683. DOI: 10.1164/ajrccm.158.5.9710086. View article on PubMed

ATS Committee on Proficiency Standards for Clinical Pulmonary Function Laboratories. ATS statement: guidelines for the six-minute walk test. Am J Respir Crit Care Med. 2002;166(1):111–117. PMID: 12091180. DOI: 10.1164/ajrccm.166.1.at1102. View guideline on PubMed

Clinical use notes

Use a standardized 6MWT protocol and record the total measured distance.
Reference equations may not perform equally across all populations, diagnoses, or testing protocols.
Do not use the predicted value or LLN alone to make treatment, admission, or prognostic decisions.