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. It is designed for clinicians, medical students, evidence-synthesis researchers. The 1 items are summed to produce a total score.
mMRC Dyspnea Scale contains 1 items. Item scores are summed to produce the total. Scores run from 0 to 4, grouped into 2 interpretation bands from ‘Low symptom burden’ up to ‘High symptom burden’.
On the mMRC Dyspnea Scale (total score 0–4), scores of 2–4 fall in the ‘High symptom burden’ band — interpreted as: High impact. The full ladder is: 0–1 — Low symptom burden: Low impact.; 2–4 — High symptom burden: High impact. A higher score reflects a more severe presentation, and crossing a cutoff is a prompt to step up assessment or care — but these bands are screening thresholds, not diagnoses.
Scores of 0–1 fall in the ‘Low symptom burden’ band: Low impact. A low score is reassuring but does not by itself rule out the underlying condition — if symptoms or clinical suspicion persist, reassess over time or use a complementary evaluation rather than relying on the number alone.
Yes — mMRC Dyspnea Scale is in the public domain and free for clinical, educational, and research use without permission. You can use this calculator and the scale itself freely; if you publish results or reproduce the scale, cite the original source paper.
Mahler DA, Wells CK. Chest. 1988;93(3):580-586. This is the original publication for the mMRC Dyspnea Scale — the reference to cite when reporting results.
No. mMRC Dyspnea Scale is a structured assessment aid, not a diagnostic test. Its proper role is clinical assessment of functional impact of breathlessness — it standardizes assessment and flags who needs closer evaluation, but the result must be weighed alongside history, examination, and clinical context. When a score conflicts with your clinical impression, clinical judgment takes precedence; treatment decisions should never rest on a screening score alone.
mMRC Dyspnea Scale is supported by the following peer-reviewed sources: