ProReckoner's paramedic calculators are built for prehospital and emergency use — fast on mobile, accurate on scene. Tools cover clinical scoring (APGAR, Revised Trauma Score, GCS), drug and fluid calculations (Parkland formula, weight-based dosing, cardiac arrest drugs), vital sign interpretation and scene operations. All tools use current ARC, ILCOR and ATLS guidelines. Metric and Imperial supported.
Clinical Assessment
3 toolsAPGAR Score
Neonatal assessment at 1 and 5 minutes. Score Appearance, Pulse, Grimace, Activity and Respiration (0–2 each).
APGAR = Appearance + Pulse + Grimace + Activity + Respiration
Interpretation: 7–10 = Normal · 4–6 = Moderately depressed · 0–3 = Severely depressedRepeat at 5 min if 1-min score <7. Repeat at 10 min if 5-min score <7.
Revised Trauma Score (RTS)
Physiological triage tool for trauma severity. Uses coded values for GCS, systolic BP and respiratory rate.
RTS = (0.9368×GCS) + (0.7326×SBP) + (0.2908×RR)
Maximum score = 7.84 (minor injury) · RTS <4 → trauma centre activationField Triage: RTS ≤11 (unweighted) → consider transport to trauma centre.
Shock Index
Rapid haemodynamic assessment. Heart rate divided by systolic BP — values above 1.0 indicate significant haemorrhage risk.
Shock Index = Heart Rate ÷ Systolic BP
Ranges: <0.6 Normal · 0.6–1.0 Monitor · 1.0–1.4 Haemorrhagic shock likely · ≥1.4 CriticalNormal SI in adults is 0.5–0.7. SI >1.0 is associated with significantly increased mortality.
Drug & Fluid
3 toolsParkland Burns Formula
24-hour fluid resuscitation volume for burn patients. Splits delivery into first 8 hours and next 16 hours from time of burn.
Total 24h = 4 mL × Weight (kg) × TBSA%
First 8h = Total ÷ 2 · Next 16h = Total ÷ 2
Rule of Nines: Head 9% · Each arm 9% · Each leg 18% · Anterior trunk 18% · Posterior trunk 18% · Perineum 1%Use Hartmann's (Lactated Ringer's). Time from injury, not hospital arrival.
Prehospital Drug Dose (mg/kg)
Weight-based drug dose and volume calculation for prehospital and emergency use. Auto-converts lb→kg.
Total mg = Weight (kg) × Dose (mg/kg)
Volume (mL) = Total mg ÷ Concentration (mg/mL)
Example (morphine): 80 kg · 0.1 mg/kg · 10 mg/mL stock → 8 mg → 0.8 mL
Cardiac Arrest Drug Doses
Adrenaline, amiodarone and atropine doses for adult and paediatric cardiac arrest. Auto-switches to paediatric doses below 40 kg.
Adrenaline: 1 mg IV/IO every 3–5 min (1:10,000 — 10 mL)
Amiodarone: 300 mg IV/IO bolus after 3rd shock · 150 mg after 5th
Atropine: 3 mg IV/IO (single dose for asystole/PEA — not routine in ALS)
Paediatric adrenaline: 0.01 mg/kg IV/IO (max 1 mg)
Paediatric amiodarone: 5 mg/kg IV/IO (max 300 mg)
Vitals & Monitoring
3 toolsMean Arterial Pressure (MAP)
Calculated MAP from systolic and diastolic BP. Minimum MAP of 65 mmHg required for adequate organ perfusion.
MAP = DBP + ⅓ × (SBP − DBP)
Normal MAP: 70–100 mmHgMAP <60 mmHg = inadequate cerebral and renal perfusion
MAP ≥65 mmHg is the target in septic shock (Surviving Sepsis Campaign)
SpO₂ / FiO₂ Ratio (S/F)
Non-invasive approximation of P/F ratio for respiratory assessment. Identifies mild, moderate and severe hypoxaemia without ABG.
S/F Ratio = SpO₂ ÷ FiO₂ (as decimal)
FiO₂ guide: Room air 21% · Nasal cannula 1L=24%, 2L=28%, 4L=36%, 6L=44% · Simple mask ~40% · NRB mask ~60–80% · BVM 100%S/F thresholds (ARDS Berlin): ≥315 Normal · 235–314 Mild · 148–234 Moderate · <148 Severe
Respiratory Rate Assessment
Age-adjusted normal respiratory rate ranges. Flags bradypnoea, mild tachypnoea and severe tachypnoea for immediate action.
Adult: 12–20 · Child 6–12 yrs: 18–30 · Child 1–5 yrs: 22–37 · Infant: 30–53 · Neonate: 35–60 breaths/min
Bradypnoea: below range · Tachypnoea: above range
Count for a full 60 seconds for accuracy. RR is one of the earliest indicators of deterioration.
Scene & Operations
3 toolsScene Time Calculator
Total time on scene with case-type benchmarks. Flags when scene time exceeds targets for cardiac arrest, trauma, stroke and medical cases.
Cardiac arrest: <8 min · Trauma: ≤10 min (Platinum 10) · Stroke: <15 min · General medical: <20 min
Scene time = Departure − Arrival (adjusts for midnight crossover)
GCS — Prehospital
Glasgow Coma Scale for prehospital use. Severity classification with transport and pre-alert guidance for paramedics.
GCS = Eye (1–4) + Verbal (1–5) + Motor (1–6)
Prehospital thresholds:GCS ≤8 → airway intervention consideration, pre-alert trauma team
GCS <14 → document and report to receiving hospital
Drop of ≥2 points → reassess immediately and escalate
Paeds Weight Estimator (Broselow)
Estimated weight by age (APLS formula) or measured length (Broselow approximation). Includes emergency drug doses for the estimated weight.
Infant (<1 yr): (age months + 9) ÷ 2
1–5 yrs: (age × 2) + 8
6–12 yrs: (age × 3) + 7
The Broselow tape uses measured length as a proxy for weight, colour-coded to pre-calculated drug doses. Use actual weight whenever possible.