Respiratory rate (age-dependent)

≤ 60 (0–8 wk), ≤ 50 (2–11 mo), ≤ 40 (12–23 mo), ≤ 34 (2–3 y), ≤ 30 (4–5 y), ≤ 26 (6–12 y), ≤ 23/min (≥ 13 y) 1 61–69 / 51–59 / 41–44 / 35–39 / 31–35 / 27–30 / 24–27/min 2 ≥ 70 / ≥ 60 / ≥ 45 / ≥ 40 / ≥ 36 / ≥ 31 / ≥ 28/min 3

Retractions

none 0 subcostal or intercostal 1 two of: subcostal, intercostal, substernal – or nasal flaring (infant) 2 three of: subcostal, intercostal, substernal, suprasternal, supraclavicular – or nasal flaring/head bobbing (infant) 3

Dyspnea (age-dependent)

normal: drinking, vocalizing, activity/play; > 4 y: counts to ≥ 10 in one breath 0 one of: feeding difficulty, less vocalizing, restlessness (< 2 y) or less appetite, cough after play, hyperactivity (2–4 y); > 4 y: counts up to 7–9 1 two of these signs; > 4 y: counts up to 4–6 2 not drinking/eating, not playing, not vocalizing, drowsy or confused; > 4 y: counts to ≤ 3 3

Auscultation

normal, no wheezing 0 end-expiratory wheeze only 1 expiratory wheezing 2 inspiratory and expiratory wheezing and/or diminished breath sounds 3

Calculation aid for healthcare professionals: the calculator reproduces what the sources cited assign to the inputs. Clinical assessment and every treatment decision remain with the treating physician. Inputs and results are not stored.