Enter the five MEWS parameters
Enter the five bedside parameters, then press Calculate.
MEWS allocation chart (Subbe et al., 2001)
| Parameter | 3 | 2 | 1 | 0 | 1 | 2 | 3 |
|---|---|---|---|---|---|---|---|
| Systolic BP (mmHg) | ≤70 | 71–80 | 81–100 | 101–199 | — | ≥200 | — |
| Heart rate (bpm) | — | <40 | 41–50 | 51–100 | 101–110 | 111–129 | ≥130 |
| Respiratory rate (/min) | — | <9 | — | 9–14 | 15–20 | 21–29 | ≥30 |
| Temperature (°C) | — | <35.0 | — | 35.0–38.4 | — | ≥38.5 | — |
| AVPU | Unresponsive | Pain | Voice | Alert | — | — | — |
Score each parameter independently and sum the five values. Local variants exist; this chart follows the original Subbe (2001) allocation.
Worked example
Systolic BP 95 mmHg (1) + heart rate 105 bpm (1) + respiratory rate 22/min (2) + temperature 36.5°C (0) + responds to voice (1) = MEWS 5 → medium risk: urgent review and more frequent observations. Verify it yourself in the calculator above.
Frequently asked questions
What is the Modified Early Warning Score (MEWS)?
The Modified Early Warning Score (MEWS) is a bedside track-and-trigger tool introduced by Subbe and colleagues (QJM, 2001) that turns five routine vital signs — systolic blood pressure, heart rate, respiratory rate, body temperature, and level of consciousness (AVPU) — into a single score from 0 to 14. Higher scores flag a greater risk of clinical deterioration, prompting earlier review and intervention.
How is the MEWS calculated?
Each of the five parameters is scored 0 to 3 against the Subbe (2001) allocation table, and the five sub-scores are added together. For example, systolic BP 101–199 scores 0, heart rate 111–129 scores 2, respiratory rate 21–29 scores 2, temperature below 35°C or 38.5°C and above scores 2, and an unresponsive patient (U on AVPU) scores 3. The total is the MEWS, ranging from 0 to 14.
What MEWS score is normal, and what needs urgent review?
A total of 0–4 is considered low risk: continue routine monitoring. A score of 5–6 is medium risk and should trigger urgent review by a ward doctor or acute team nurse, with more frequent observations. A score of 7 or more is high risk and calls for emergency assessment, usually by the critical care team. Two extra track-and-trigger rules are common: any single parameter scoring 3, or a rise of 2 or more from a previous score, also prompts escalation — even if the total is still modest.
What is the maximum possible MEWS score?
14. The theoretical maximum combines the worst sub-score on every parameter: systolic BP 70 mmHg or less (3), heart rate 130 bpm or more (3), respiratory rate 30 breaths per minute or more (3), temperature below 35°C or 38.5°C and above (2), and unresponsive on AVPU (3). That gives 3+3+3+2+3 = 14.
What does AVPU mean in the MEWS chart?
AVPU is a quick consciousness scale: A = Alert, V = responds to Voice, P = responds to Pain, U = Unresponsive. In MEWS it scores 0, 1, 2, and 3 respectively. Altered consciousness is one of the earliest and most sensitive markers of shock, sepsis, or neurological deterioration, so even a drop from Alert to Voice adds a point and should prompt a recheck of the other vital signs.
What is the difference between MEWS and NEWS2?
MEWS (Subbe 2001) is the older, simpler score with five parameters and no oxygen measurement. NEWS2, developed by the Royal College of Physicians, adds oxygen saturation and supplemental oxygen use as scored parameters, uses a 0–3 scale per parameter with a 0–20 total, and includes a separate oxygen-target scale for patients with hypercapnic respiratory failure. NEWS2 is the standard in UK hospitals; MEWS remains useful as a teaching tool and in resource-limited settings because it needs only a cuff, a watch, and a thermometer.
Is MEWS a diagnosis?
No. MEWS is a screening and deterioration aid, not a diagnosis and not a substitute for clinical judgement. It was validated in adult medical admissions to predict mortality, ICU admission, and cardiac arrest — it does not tell you what is wrong with the patient. Treat any score as a prompt to assess the patient, not as a label.
Can MEWS be used for children or pregnant patients?
MEWS was validated in adult medical admissions, and its normal ranges do not apply to children, who have age-dependent vital-sign norms — pediatric early warning scores (such as PEWS variants) exist for that purpose. Obstetric patients likewise need maternity-specific scores (MEOWS). Using adult MEWS cutoffs outside the adult population can mislead, so choose the score built for the patient in front of you.
Can I enter temperature in Fahrenheit?
Yes. This calculator accepts temperature in Celsius or Fahrenheit and converts internally before scoring against the 35.0–38.4°C normal band. For reference, the MEWS temperature bands are: below 95.0°F (35.0°C) scores 2, 95.0–101.1°F scores 0, and 101.3°F (38.5°C) and above scores 2.
A patient scored 5 but looks fine. Should I still escalate?
A MEWS of 5 or more is linked in the original Subbe (2001) study to a clearly increased likelihood of death and ICU admission, so yes: the score exists precisely to catch deterioration that is not yet obvious. Review the patient, increase observation frequency, and look for trends — a rising score is often more informative than a single snapshot. When in doubt, escalate; early warning scores are designed to err on the side of review.
Do all hospitals use the same MEWS thresholds?
The five parameters and their 0–3 allocation table are consistent (Subbe 2001), but response thresholds and observation frequencies vary between hospitals and trusts — some escalate at 4, some use modified parameter bands (for example, local variants with different blood-pressure cutoffs). This calculator uses the widely cited 0–4 / 5–6 / ≥7 band convention; always follow your own institution’s escalation protocol, which takes precedence.
Is my data sent anywhere when I use this calculator?
No. This MEWS calculator runs entirely in your browser: the scoring engine is plain JavaScript on this page, and the optional trend tracker stores readings in your browser’s local storage on your own device. Nothing is uploaded, no account is needed, and clearing your browser data removes the saved trend history.
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