Functional impact of breathlessness. Free to use.
mMRC Dyspnea Scale (Modified Medical Research Council Dyspnea Scale) is a validated clinical instrument used to assess functional impact of breathlessness. The instrument contains 1 item.
Source / attribution: Mahler DA, Wells CK. Chest 1988
The instrument's primary construct — functional impact of breathlessness — is operationalized through a fixed set of items, each with a defined response format. This standardisation is what allows mMRC Dyspnea Scale scores to be compared meaningfully across clinicians, sites, and studies.
Like all screening or assessment instruments, mMRC Dyspnea Scale is a structured aid — not a diagnostic test in isolation. Results should be interpreted alongside history, examination, and clinical context. Where a score crosses an actionable threshold, the next step is typically a more detailed clinical evaluation rather than a definitive diagnosis.
Answer all 1 item below to see your mMRC Dyspnea Scale score and interpretation.
Each item is scored on a 5-point scale (0–4). Your score updates live as you answer.
All scoring runs in your browser. No data is sent anywhere — close the tab and the answers are gone.
mMRC Dyspnea Scale uses simple summation: each item's selected response is converted to a numeric value, and the values are added to produce a total score. Reverse-scored items are inverted before summation.
Scoring notes: Educational use only.
The cutoffs below are drawn from the published validation literature. Always interpret in clinical context.
| Score range | Band | Interpretation |
|---|---|---|
| 0–1 | Low symptom burden | Low impact. |
| 2–4 | High symptom burden | High impact. |
This is an illustrative walkthrough, not a real patient. Follow the same four steps with your own answers — or use the live calculator at the top of this page.
Read each question and choose the response that best fits. Each response has a number next to it — that number is the item's score. The example below uses illustrative answers.
| # | Item | Example response | Score |
|---|---|---|---|
| 1 | Breathlessness grade | Stops for breath after ~100 m or after a few minutes | 3 |
Add up all the item scores you noted in Step 1.
3 = 3
Find the row in the interpretation table whose range contains your total:
Total = 3 falls between 2 and 4 → High symptom burden
High symptom burden. Used in COPD GOLD assessment.
A score is one input alongside history and examination. mMRC Dyspnea Scale supports clinical judgment — it does not replace it.
If mMRC Dyspnea Scale doesn't fit your context, related instruments in pulmonology include:
| Scale | Measures | Items | Time |
|---|---|---|---|
| CURB-65 | 30-day mortality in community-acquired pneumonia | 5 | — |
| PERC Rule | Rule out PE in low-risk patients | 8 | — |
| sPESI | 30-day mortality risk after acute PE | 6 | — |
| Wells Score (PE) | Pre-test probability of pulmonary embolism | 7 | — |
| APGAR Score | Rapid assessment of newborn at 1 and 5 min | 5 | — |
| ASA Physical Status | Pre-operative health status | 1 | — |
| CHA2DS2-VASc | Annual stroke risk in non-valvular atrial fibrillation | 8 | — |
| Glasgow Coma Scale | Level of consciousness after head injury | 3 | — |
mMRC Dyspnea Scale (Modified Medical Research Council Dyspnea Scale) is a validated instrument that assesses functional impact of breathlessness.
mMRC Dyspnea Scale contains 1 item. Items are summed to produce a total score.
Scores of 2–4 fall in the "High symptom burden" band. High impact.
Scores of 0–1 fall in the "Low symptom burden" band. Low impact.
Yes — mMRC Dyspnea Scale is in the public domain and free for clinical, educational, and research use without permission.
Mahler DA, Wells CK. Chest. 1988;93(3):580-586.
No. mMRC Dyspnea Scale is a structured assessment aid. A score is one input alongside history, examination, and clinical context. Treatment decisions should never rest on a screening score alone.
mMRC Dyspnea Scale is supported by the following peer-reviewed sources: