MEWS Score Calculator — Modified Early Warning Score
The Modified Early Warning Score (MEWS) aggregates five bedside vital signs — respiratory rate, temperature, systolic blood pressure, heart rate, and neurological status (AVPU) — into a single score (0–14). A rising or elevated MEWS flags physiological deterioration and triggers structured escalation.
breaths/min
°C
mmHg
bpm
Consciousness (AVPU)
Modified Early Warning Score — range 0 (lowest risk) to 14 (highest risk)
- 1
Respiratory rate score
RR = 16 breaths/min → score = 1 - 2
Temperature score
T = 37 °C → score = 0 - 3
Systolic BP score
SBP = 120 mmHg → score = 0 - 4
Heart rate score
HR = 80 bpm → score = 0 - 5
Consciousness score
AVPU (alert) → score = 0 - 6
Total MEWS
1 + 0 + 0 + 0 + 0 = 10–1 low risk; 2–4 increase monitoring; ≥ 5 urgent review.
How does this calculator work?
MEWS sums subscores for respiratory rate, temperature, systolic BP, heart rate, and AVPU consciousness. Each parameter scores 0 (normal) to 3 (severely abnormal); the maximum total is 14. Score 0–1 = low risk; 2–4 = increase monitoring; ≥5 = urgent review. Based on Subbe et al. (2001). Follow your institution's escalation protocol.
Formula
How this is calculated
MEWS was described by Subbe et al. (2001) as a simple, rapidly calculable bedside score. Each of five vital signs is placed into a category that earns 0–3 points: 0 for the normal range, 1–3 for increasingly abnormal values (below or above the normal range). Respiratory rate ≤8 or ≥30 earns 3 points; heart rate ≥130 earns 3 points; systolic BP ≤70 earns 3 points; unresponsiveness earns 3 points on the AVPU scale. Temperature only goes up to 2 points. The five subscores are summed to give the total MEWS (0–14).
A score of 0–1 indicates low physiological risk; 2–4 suggests the patient warrants increased monitoring frequency; ≥5 is widely used as a threshold for urgent medical review or activation of a rapid-response team. Many hospitals set their calling threshold at 4 or 5 and document the trajectory (improving, static, or deteriorating) alongside the absolute score.
MEWS was designed for general adult inpatient wards and has been validated primarily in that setting. It performs less reliably in paediatric, obstetric, and ICU populations, where disease-specific or age-adjusted scoring systems (e.g. PEWS, NEWS2) are preferred. Individual hospitals may use locally adapted versions of the thresholds — always follow your institution's escalation protocol.
Frequently asked questions
Most institutions use a threshold of MEWS ≥ 5 to trigger an urgent medical review or rapid-response call, though many set the threshold at 4 or even 3 for certain high-risk patient groups. The trend (a rising score) is as important as the absolute value. Always follow your hospital's escalation policy.
The National Early Warning Score (NEWS/NEWS2) is a more recent UK-developed tool endorsed by the Royal College of Physicians. It adds oxygen saturation and supplemental oxygen as parameters and has been more extensively validated across diverse settings. MEWS (2001) is simpler and remains widely used outside the UK.
AVPU is a rapid four-point neurological assessment: A = Alert (patient is fully awake and oriented, 0 points); V = responds to Voice (responds to spoken instructions or questions, 1 point); P = responds to Pain (no verbal response but reacts to a painful stimulus, 2 points); U = Unresponsive (no response to any stimulus, 3 points).
Also known as
TG we-Calculate Editorial Team. (2026). MEWS Score Calculator — Modified Early Warning Score [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/mews-score-calculator
TG we-Calculate Editorial Team. "MEWS Score Calculator — Modified Early Warning Score." TG we-Calculate. 2026. https://we-calculate.com/calculator/mews-score-calculator.
TG we-Calculate Editorial Team, "MEWS Score Calculator — Modified Early Warning Score," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/mews-score-calculator
@misc{wecalculate_mews_score_calculator, title = {MEWS Score Calculator — Modified Early Warning Score}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/mews-score-calculator}}, year = {2026}, note = {TG we-Calculate} }
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