Six-Minute Walk Distance Calculator (6MWT)

Sex	Equation
Men	7.57 × height(cm) − 5.02 × age − 1.76 × weight(kg) − 309
Women	2.11 × height(cm) − 2.29 × weight(kg) − 5.78 × age + 667

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Walk-through

How to Use This Calculator

4 steps

1

Enter your age, sex, height, and weight

Fill in your age in years, select your sex, and enter your height and weight. Use the unit toggle to switch between metric (cm/kg/m) and imperial (in/lb/ft) — the calculator converts everything internally. You can also click a preset (adult man, adult woman, older adult, or a case with a test result already filled in) to load a realistic starting point.

2

Read your predicted distance

The headline number is your predicted six-minute walk distance — how far someone of your age, sex, height, and weight is expected to walk in six minutes, based on the Enright & Sherrill reference equations. The interpretation panel explains what that number means in plain language.

3

Add an actual measured distance (optional)

If you or someone you're supporting has actually completed a six-minute walk test, enter that measured distance in the optional field. The calculator will show it as a percentage of your predicted distance and describe, in plain language, how it compares.

4

Check the % of Predicted and Reference Equation tabs

The % of Predicted tab lays out the full breakdown — predicted, actual, and percentage — plus a side-by-side comparison showing how the formula differs for men and women. The Reference Equation tab shows both published equations and a worked example so you can verify the math yourself.

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Reference

Formula & Methodology

3 formulas

Predicted 6-Minute Walk Distance — Men

predicted (m) = 7.57 × height(cm) − 5.02 × age − 1.76 × weight(kg) − 309

Height is in centimetres, weight in kilograms, and age in years. The result is a predicted distance in metres. Constants are from the Enright & Sherrill (1998) reference equations, derived from a study of healthy adults.

Predicted 6-Minute Walk Distance — Women

predicted (m) = 2.11 × height(cm) − 2.29 × weight(kg) − 5.78 × age + 667

Same units as the men's equation. Women's predicted distances use different constants because average stride length, muscle mass, and cardiopulmonary capacity differ by sex on average — using a single formula for both sexes would systematically over- or under-predict one group.

% of Predicted

% of predicted = 100 × actual distance / predicted distance

Only calculated when you enter an actual measured distance. It expresses your real-world result as a percentage of the reference prediction for someone of your profile — a common way to normalise a raw walk distance so it can be compared across people of different ages, sexes, heights, and weights.

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YMYL

Trust, Methodology & Sources

Written by Calculover Editorial Team · Updated 2026-07-23 · 2 sources

Editorial accountability

Author: Calculover Editorial Team - Editor

Owner: Calculover Editorial Team - Editorial owner

Last reviewed: 2026-07-23

Last verified: 2026-07-23

Methodology

The Six-Minute Walk Distance Calculator applies the published Enright & Sherrill (1998) reference equations for predicted six-minute walk distance: for men, predicted(m) = 7.57 × height(cm) − 5.02 × age − 1.76 × weight(kg) − 309; for women, predicted(m) = 2.11 × height(cm) − 2.29 × weight(kg) − 5.78 × age + 667. Height and weight entered in imperial units are converted to centimetres and kilograms before computation. When an actual measured distance is supplied, % of predicted is computed as 100 × actual / predicted and described using plain, non-diagnostic language rather than a formal clinical severity tier.

Assumption: Age, height, and weight are entered accurately for the same individual, with the unit system set correctly before reading the result.

Assumption: The user wants a reference/screening estimate of expected walk distance for comparison purposes, not a diagnosis or a substitute for an administered six-minute walk test.

Assumption: Any actual distance entered was measured under conditions reasonably similar to a standard six-minute walk test protocol (flat, measured course).

Limitations & guidance

The reference equations were derived from healthy adults roughly age 40 to 80; predictions for people well outside that age range are an extrapolation, not a validated result.

The equations do not account for medical conditions, medications, motivation, assistive devices, or the exact corridor length and surface used during an actual test, all of which can affect a real result.

% of predicted is shown with a plain-language description only — this calculator does not assign a formal clinical severity grade, and any low result should be discussed with a clinician rather than interpreted on its own.

Professional guidance: The Six-Minute Walk Distance Calculator is for health education and reference purposes only. It is an estimate, not a diagnosis, and it is not medical advice or a substitute for assessment, diagnosis, or treatment by a qualified healthcare professional. The six-minute walk test itself should be administered by a trained professional. Do not make medical decisions based on its output.

Primary sources

Enright PL, Sherrill DL. Reference equations for the six-minute walk in healthy adults. American Journal of Respiratory and Critical Care Medicine. 1998;158(5):1384-7. - American Journal of Respiratory and Critical Care Medicine

ATS Committee on Proficiency Standards for Clinical Pulmonary Function Laboratories. ATS Statement: Guidelines for the Six-Minute Walk Test. - American Thoracic Society

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Glossary

Key Terms Explained

6 terms

Six-Minute Walk Test (6MWT) A submaximal exercise test that measures the total distance a person can walk on a flat, hard surface in six minutes, at their own pace, with rests allowed. It's widely used to assess functional exercise capacity.

Predicted distance The distance a healthy person of a given age, sex, height, and weight is expected to walk in six minutes, based on a published reference equation derived from a sample of healthy adults.

Enright & Sherrill equation The specific sex-specific reference equation this calculator uses, published by Enright and Sherrill in 1998, based on a study of healthy adults roughly age 40 to 80.

Exercise capacity A general term for how much physical exertion a person's cardiovascular and respiratory systems can sustain — the six-minute walk test is one common, low-cost way to estimate it.

% of predicted An actual measured distance divided by the predicted distance for that person's profile, expressed as a percentage. It's a way to normalise a raw walk distance for comparison.

Reference equation A formula derived from measuring a sample population, used to estimate a typical or expected value (here, walk distance) for someone with a given set of characteristics.

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Scenarios

Real-World Examples

3 worked examples

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Healthy adult man

45-year-old man, 175 cm, 80 kg

Age 45 Height 175 cm Weight 80 kg

Predicted distance ≈ (7.57 × 175) − (5.02 × 45) − (1.76 × 80) − 309 = 1324.75 − 225.9 − 140.8 − 309 ≈ 649 m. No actual distance was entered, so only the predicted figure is shown.

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Healthy adult woman

45-year-old woman, 162 cm, 65 kg

Age 45 Height 162 cm Weight 65 kg

Predicted distance ≈ (2.11 × 162) − (2.29 × 65) − (5.78 × 45) + 667 = 341.82 − 148.85 − 260.1 + 667 ≈ 600 m. Comparing this to the man's example above shows how the sex-specific constants shift the result even at similar ages.

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With an actual test result

55-year-old woman, 165 cm, 70 kg, walked 480 m

Predicted ≈ 620 m Actual 480 m

480 ÷ 620 ≈ 77% of predicted — described here as "notably below predicted." That gap doesn't say why on its own; it could reflect deconditioning, an off day, or a health condition, and is worth discussing with a clinician rather than interpreting in isolation.

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Deep Dive

Understanding the Six-Minute Walk Distance Calculator

3 chapters · 4 min read

The six-minute walk test (6MWT) is a simple, low-cost way to measure how far someone can walk in six minutes — a widely used proxy for functional exercise capacity. This calculator uses the published Enright & Sherrill reference equations to estimate the distance a healthy person of a given age, sex, height, and weight would be expected to walk, and lets you compare an actual measured result against that prediction. This guide explains how the formula works, what each input means, and where its limits lie.

How the prediction works

Enright and Sherrill derived their reference equations from a study of healthy adults, using linear regression to relate walked distance to age, height, and weight, separately for men and women. Each equation is a simple weighted sum: taller people are predicted to walk further (a taller stride covers more ground), older people are predicted to walk less far, and heavier people are predicted to walk somewhat less far as well, all combined into a single linear formula per sex.

Because the equations were fit separately for men and women, the constants differ — this isn't a rounding difference, it reflects real average differences in stride length, muscle mass, and cardiopulmonary capacity between the sexes in the reference sample.

Inputs and what they mean

Age is in years and has a negative coefficient in both equations — predicted distance decreases as age increases, reflecting typical age-related declines in exercise capacity. Sex selects which of the two equations is used. Height and weight can be entered in metric or imperial units; the calculator converts internally to centimetres and kilograms before applying the formula. The optional actual measured distance input lets you see a real six-minute walk test result expressed as a percentage of the prediction — leave it blank if you only want the predicted figure.

Limits and edge cases

The reference sample behind these equations was healthy adults roughly age 40 to 80 — predictions for people well outside that range are an extrapolation rather than a validated result. The equations also don't account for known medical conditions, medications, motivation, or the exact walking surface and corridor length used, all of which can meaningfully affect a real test result. This calculator gives a reference number for comparison, not a diagnosis: the six-minute walk test itself should be administered by a trained professional following a standardised protocol, and any result well below predicted should be discussed with a clinician rather than interpreted from a percentage alone.

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Questions

Frequently Asked Questions

6 questions

What is the 6MWT?+

The six-minute walk test is a submaximal exercise capacity test that measures the total distance a person can walk, at their own pace, on a flat surface in six minutes. It's used as a simple, low-cost proxy for cardiopulmonary and functional exercise capacity.

What's the source of this equation?+

This calculator uses the Enright & Sherrill (1998) reference equations, a widely cited published set of formulas derived from a study of healthy adults, with separate constants for men and women.

What does % of predicted mean?+

It's your actual measured distance divided by the predicted distance for someone of your age, sex, height, and weight, expressed as a percentage. It's a common way to put a raw walk distance in context — but this calculator describes it in plain language only and does not assign a formal clinical severity grade.

What units does it use?+

You can enter your height, weight, and actual distance in either metric (centimetres, kilograms, metres) or imperial (inches, pounds, feet) — the unit toggle switches all three at once, and the calculator converts internally before computing.

Is this a diagnostic test?+

No. This is a reference calculator, not a clinical test administration. The actual six-minute walk test should be conducted by a trained professional following a standardised protocol on a measured, flat course.

Is this medical advice?+

No. This calculator is for informational and educational purposes only. It is not a substitute for assessment, diagnosis, or treatment by a qualified healthcare professional — talk to a clinician about what your result means for you.

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Six-Minute Walk Distance Calculator