Critical Care Calculators

Estimate the alveolar–arterial oxygen gradient to assess gas exchange and identify causes of hypoxaemia.

Rapid interpretation of acid–base status and compensatory physiology from arterial blood gas values.

Estimate basal metabolic requirements to guide nutritional support in clinical and critical care settings.

Assess the probability of invasive candidiasis to guide early antifungal therapy decisions.

Calculate delivered oxygen fraction accounting for sweep gas flow and nitric oxide admixture in ECMO circuits.

Convert and interpret gas tensions across units and conditions for accurate physiological analysis.

Estimate risk and severity in gastrointestinal bleeding to support triage and management decisions.

Convert between infusion rates and weight-based dosing for accurate drug delivery in ICU settings.

Estimate probability of acute coronary occlusion using ECG-based scoring for early reperfusion decisions.

Estimate mechanical power delivered during ventilation to guide lung-protective strategies.

Quickly convert between commonly used medical units across biochemistry, gases, and physiology.

Calculate weight-based noradrenaline dosing and infusion rates for haemodynamic support.

Convert between opioid agents to determine equivalent analgesic dosing safely.

Calculate oral liquid medication doses based on concentration and prescribed dose, including paediatric use.

Compare oxygen delivery across devices including low flow, high flow, and non-invasive support.

Assess severity of respiratory failure using oxygenation index for escalation and ECMO consideration.

Calculate P/F ratio to classify severity of hypoxaemia and ARDS.

Determine phenylephrine infusion rates for blood pressure support in acute care.

Assess right ventricular function and haemodynamic status using PAPi.

Calculate appropriate salbutamol dosing for intravenous therapy.

Estimate physiological shunt to quantify impairment in oxygenation.

Adjust serum sodium for hyperglycaemia to better reflect true osmotic status.

Estimate total body water based on patient characteristics to guide fluid and drug dosing.

Calculate airway or vascular cross-sectional area to understand device proportional occlusion, flow dynamics and resistance.

Convert between tube diameter, gauge, and French size for airway and procedural equipment.

Guide vancomycin dosing using pharmacokinetic principles and therapeutic targets.

Estimate survival probability in VV ECMO to support clinical decision-making.