The 6-minute walk test: how to do it, normal distance and what counts as a real change

The 6-minute walk test (6MWT) is one of the most widely used fitness tests in hospitals and physiotherapy clinics. The idea could hardly be simpler: the farthest you can walk on a flat course in six minutes. No treadmill, no lab, no special equipment, which also makes it a practical way to track your fitness over time.

Safety first: who shouldn’t do it

Six minutes sounds short, but the test can push you hard. The American Thoracic Society (ATS) guideline lists:

• Do not do the test if you have had unstable angina (chest pain that comes on at rest or keeps getting worse) or a heart attack in the past month.
• Check with your doctor first if your resting heart rate is above 120, or your blood pressure is above 180 systolic or 100 diastolic.

The test stops straight away if you get chest pain, severe breathlessness, start to stagger or feel unwell. If you have a heart or lung condition, do the test with your doctor or physiotherapist, not on your own.

How to do the test

In clinical settings the test is done on a flat, straight course of at least 30 metres (about 100 feet). If you’re doing it for your own tracking, follow the same idea:

1. Set up a course. Find a flat, non-slippery stretch at least 30 m long with no traffic, and mark both ends.
2. Rest first. Sit for a few minutes before you start.
3. Walk as far as you can in 6 minutes without running. Turn at each end and keep going.
4. Slow down or stop if you need to. Rest is allowed; carry on when you can. The clock keeps running.
5. Record your distance. Multiply the number of lengths by the course length and add the final partial length.

Have someone with you to keep time and to help if anything goes wrong.

Your predicted distance: the Enright equations

Your distance means more when you compare it with what’s expected for your age, height and weight. Enright and Sherrill’s reference equations, derived from healthy adults, are (height in cm, weight in kg, age in years, result in metres):

• Men: 7.57 × height − 5.02 × age − 1.76 × weight − 309
• Women: 2.11 × height − 2.29 × weight − 5.78 × age + 667

Two examples:

Person	Calculation	Predicted distance
Man, 50, 175 cm (5′9″), 80 kg (176 lb)	7.57 × 175 − 5.02 × 50 − 1.76 × 80 − 309	about 624 m
Woman, 55, 162 cm (5′4″), 60 kg (132 lb)	2.11 × 162 − 2.29 × 60 − 5.78 × 55 + 667	about 554 m

Divide your own distance by the predicted value and multiply by 100 to get your “percent predicted”. It’s a comparison, not a diagnosis. If you are well below the predicted distance, or your distance is dropping over time, talk to your doctor.

How big a change is real?

When you repeat the test, not every difference is real progress. According to the ERS/ATS technical standard:

• The smallest meaningful change is about 30 metres. Smaller differences can be day-to-day noise.
• The learning effect is 24–29 metres. Most people walk farther on their second test simply because they know what to expect.

So treat your first test as a practice run, or do two tests on the same day and keep the better one. Repeat later tests on the same course, at a similar time of day and in similar conditions.

Can a smartwatch do the test for you?

Apple Watch can estimate your six-minute walk distance from your everyday walking. In Apple’s validation study the estimate was tested in adults aged 65 and over, with a mean error of 1 ± 51 metres, and it needs a period of wear-time data before it appears. It’s a handy way to follow trends, but it doesn’t replace the real test.

The 6-minute walk test in Durma

Durma guides you through the test step by step. It first asks health questions to check that nothing rules the test out, then keeps time, measures your distance and compares your result with your Enright predicted distance. Your results are saved so you can see how they change over the months.