Predicted 6-minute walk distance (6MWD) from published reference equations, your percent predicted, lower limit of normal, a lap counter, test-to-test change vs MCID, and an ATS protocol checklist.
Educational tool — not medical advice. Clinical interpretation by a qualified health professional.Enter two 6MWT results to see whether the change reaches the minimal clinically important difference. Uses 30 m as a reference point within the commonly cited 25–33 m range.
Educational summary of the ATS 2002 standardized protocol. This is not a substitute for the full guideline or clinical training.
The 6-minute walk test measures the distance walked on a flat, hard surface in six minutes. Reference equations predict the distance a healthy person of your age, height, weight, and sex would walk, so your result can be expressed as percent predicted = (actual ÷ predicted) × 100. Select any of the three published equations in the calculator above:
Men: 6MWD = 7.57 × height(cm) − 5.02 × age − 1.76 × weight(kg) − 309
Women: 6MWD = 2.11 × height − 2.29 × weight − 5.78 × age + 667
117 healthy men and 173 healthy women, ages 40–80. Lower limit of normal: predicted − 153 m (men), − 139 m (women). Source: Am J Respir Crit Care Med. 1998;158(5 Pt 1):1384–1387.
6MWD = 218 + 5.14 × height(cm) − 5.32 × age − 1.80 × weight(kg) + 51.31 × sex (male = 1, female = 0)
Healthy elderly subjects. No published lower-limit-of-normal subtraction; this calculator shows an approximate educational band instead. Source: Eur Respir J. 1999;14(2):270–274.
Men: 6MWD = 867 − 5.71 × age + 1.03 × height(cm)
Women: 6MWD = 525 − 2.86 × age + 2.71 × height − 6.22 × BMI
Middle-aged and elderly adults. No published lower-limit-of-normal subtraction; this calculator shows an approximate educational band instead. Source: Physiother Theory Pract. 2009;25(7):516–522.
The 6-minute walk test is a standardized submaximal exercise test that measures how far a person can walk on a flat, hard surface in six minutes. It is a simple, low-cost measure of functional exercise capacity used in cardiopulmonary disease, heart failure, and pre-transplant evaluation. The American Thoracic Society (ATS) published standardized protocol guidelines in 2002.
This calculator uses published reference equations. The default, Enright and Sherrill (1998), is: men, 6MWD = 7.57 x height(cm) - 5.02 x age - 1.76 x weight(kg) - 309; women, 6MWD = 2.11 x height - 2.29 x weight - 5.78 x age + 667. Example: a 72-year-old man, 177 cm, 80 kg gives 7.57x177 - 5.02x72 - 1.76x80 - 309 = 528.7 m predicted.
Healthy adults typically walk about 400 to 700 m, but normal depends on age, height, weight, and sex, so percent predicted is preferred over absolute distance. Using Enright and Sherrill, the lower limit of normal is predicted minus 153 m for men and minus 139 m for women. Example: a 65-year-old woman, 165 cm, 70 kg has a predicted 479.2 m and a lower limit of 340.2 m.
Percent predicted is (actual distance walked / predicted distance) x 100. It expresses the result relative to the reference population. Example: with a predicted 528.7 m and an actual 432 m, percent predicted = 432 / 528.7 x 100 = 81.7%. This calculator also compares the result against the lower limit of normal where published.
They were derived from different study populations, so they predict different distances. Troosters et al. (1999) uses one equation for both sexes: 218 + 5.14 x height - 5.32 x age - 1.80 x weight + 51.31 x sex (male = 1, female = 0). Example: a 70-year-old man, 175 cm, 80 kg gives 652.4 m. Jenkins et al. (2009) uses: men, 867 - 5.71 x age + 1.03 x height (a 60-year-old man, 175 cm gives 704.7 m); women, 525 - 2.86 x age + 2.71 x height - 6.22 x BMI (a 60-year-old woman, 165 cm, 70 kg gives 640.6 m). Compare equations, and let a clinician interpret.
Published MCID estimates vary by population. The ATS/ERS 2014 technical standard reports 25 to 33 m in chronic respiratory disease, while an earlier study reported 54 m. This tool's comparison mode uses 30 m as a reference point within the commonly cited 25 to 33 m range. Example: improving from 480 m to 515 m is a +35 m change, which meets the 30 m reference.
The standardized test is designed for a clinical setting with a measured course, standardized encouragement, and monitoring of heart rate and oxygen saturation. A self-administered walk cannot reproduce those conditions, so the result is less comparable to reference values. If you try it, use a flat straight course of known length, wear proper footwear, stop if you feel chest pain, severe breathlessness, dizziness, or leg cramps, and discuss any result with a clinician.
Age, height, weight, and sex are the main predictors in the reference equations. Test conditions also matter: corridor length and number of turns, the encouragement given, a learning effect on repeat tests, footwear, walking aids, medications, time of day, motivation, and comorbidities such as arthritis, lung disease, or heart failure.
Multiply the number of full laps by the track length, then add the partial final lap: distance = laps x track length + partial lap. Example: 12 laps of a 30 m track plus a 15 m partial lap = 375 m, which equals 1230.3 ft or 410.1 yd. The ATS recommends a straight corridor at least 30 m long.
No. This tool estimates functional exercise capacity using clinical reference equations for the 6-minute walk test. A walking calorie calculator estimates energy expenditure from activity data such as MET values, speed, and body weight. They answer different questions and are not interchangeable.
Yes. This calculator is educational only: it computes reference predictions and comparisons, but a low 6-minute walk distance is nonspecific and nondiagnostic on its own. Only a qualified health professional can interpret the result in the context of your medical history, symptoms, and other tests.
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