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13 Emergency Medicine & Critical Care Calculators – Acute Assessment & Severity

Emergency and critical-care calculators cover acute disease-specific assessment, general severity and organ dysfunction, sepsis and systemic response, neurologic and sedation assessment, and hemodynamics, burns, and resuscitation arithmetic.

Each tool uses its own population, observation window, measurement definitions, and unavailable-data rules. A point total or arithmetic result from one instrument cannot be substituted for another.

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Find a Emergency Medicine & Critical Care calculator

Search the calculators in this category by name, short name, or the task description. The full task-group listing remains below.

Enter a term to narrow this category; all calculators remain available in the task groups below.

Which tool fits this task?

Compare the purpose, inputs, and returned measure before opening a calculator. These distinctions describe tool scope; they do not make a diagnosis or choose treatment.

Pneumonia severity

Both tools require an established adult community-acquired pneumonia context, but their item sets and class systems differ.

CURB-65 Score

Use when
Calculate the five-item CURB-65 score for adults with clinically diagnosed community-acquired pneumonia.
Inputs
Confusion, urea/BUN, respiratory rate, blood pressure, and age.
Returns
A CURB-65 point total.
Distinction
It is not interchangeable with PSI/PORT and does not prescribe disposition or treatment.

Adult Pneumonia Severity Index (PSI / PORT) Calculator

Use when
Calculate the formal Fine PSI/PORT class for established adult community-acquired pneumonia.
Inputs
The complete demographic, comorbidity, examination, laboratory, and radiographic items.
Returns
A PSI class and point total.
Distinction
PSI has a different item structure and population context from CURB-65.

Critical illness and organ dysfunction

Use the score whose observation window, organ definitions, and support rules match the documented data.

APACHE II Calculator

Use when
Calculate APACHE II from its first-24-hour worst-value inputs and acute physiology components.
Inputs
The 12 APS components, age points, and chronic-health input.
Returns
APACHE II total and component audit.
Distinction
It is not SOFA-1, and the page does not generate mortality or treatment output.

Classic SOFA-1 Calculator

Use when
Calculate classic SOFA-1 from six organ-system components with the selected renal evidence.
Inputs
Respiration, coagulation, liver, cardiovascular, CNS, and renal inputs.
Returns
A classic SOFA-1 total and organ audit.
Distinction
It is not SOFA-2 and does not diagnose sepsis or determine organ support.

Sepsis and systemic-response prompts

These historical or limited prompts are not independent sepsis diagnoses.

Adult qSOFA Calculator (Sepsis-3)

Use when
Calculate adult qSOFA from the three bedside criteria supported by the page.
Inputs
Respiratory rate, systolic pressure, and mental-status criterion.
Returns
A qSOFA point total.
Distinction
It is a limited prompt and not a standalone sepsis diagnosis or treatment trigger.

Classic Adult SIRS Criteria Calculator (1992)

Use when
Count classic adult SIRS criteria from submitted measurements.
Inputs
Temperature, heart rate, respiratory rate or PaCO₂, and WBC or differential inputs.
Returns
A classic SIRS count.
Distinction
SIRS is a historical systemic-response criteria set and is not synonymous with sepsis.

Neurologic and sedation assessment

Choose between a structured consciousness examination and an observation-to-stimulation sedation scale.

GCS Calculator (Glasgow Coma Scale)

Use when
Record the documented Glasgow Coma Scale eye, verbal, and motor components.
Inputs
Explicit E, V, and M component selections, with barriers handled as stated.
Returns
A GCS total and component breakdown.
Distinction
GCS is a neurologic assessment and does not reconstruct an examination or diagnose a cause.

Adult RASS Assessment (Richmond Agitation–Sedation Scale)

Use when
Record adult observed agitation or sedation through the RASS observation sequence.
Inputs
Observation, voice response, and physical-stimulation response selections.
Returns
One RASS level or a safe not-assessable state.
Distinction
RASS is not a GCS substitute and does not select sedation medication or a target.

Burn area and resuscitation arithmetic

Separate estimating burn area from applying the historical Parkland arithmetic to qualifying TBSA.

Adult Burn TBSA Calculator (Rule of Nines)

Use when
Estimate adult qualifying burn TBSA with the Rule of Nines segments.
Inputs
Adult burn-depth segment selections from the supported 15 segments.
Returns
A neutral adult TBSA percentage.
Distinction
It excludes superficial erythema and does not determine referral, fluids, or treatment.

Classic Parkland Formula for Adult Burns

Use when
Calculate the classic adult Parkland formula amount and its two time allocations from qualifying TBSA.
Inputs
Calculation weight, qualifying burn TBSA, and time allocation from burn occurrence.
Returns
Classic 4 mL/kg/%TBSA formula arithmetic and 8/16-hour allocations.
Distinction
It does not calculate prior fluid, catch-up, hourly rate, or a fluid prescription.

Choose a calculator by task

Use the task groups below to find the calculator whose formula, intended population, required measurements, and purpose match the task.

Acute disease-specific assessment

Choose Wells PE, CURB-65, PSI/PORT, or BISAP only for the stated suspected or established acute disease context and its defined inputs.

Wells PEWells Score Calculator for PECalculate the weighted Wells PE pretest-probability score with two-level and three-level classifications.CURB-65 ScoreCalculate the five-item CURB-65 score for adults with clinically diagnosed community-acquired pneumonia using confusion, urea or BUN, respiratory rate, blood pressure and age.Adult Pneumonia Severity Index (PSI / PORT) CalculatorCalculate the formal Fine 1997 two-step adult PSI/PORT class for established community-acquired pneumonia, with complete item and guideline limitations.BISAP Score Calculator for Acute PancreatitisRecord the five-item adult BISAP early prognostic score from the first 24 hours of an established acute-pancreatitis hospitalization.

Critical illness severity & organ dysfunction

Use APACHE II or classic SOFA-1 only with the measurements, time window, organ-support definitions, and population stated by that model.

APACHE II CalculatorReproduce the 1985 adult general-ICU APACHE II severity score from worst first-24-hour physiology, age and defined chronic-health points.Classic SOFA-1 CalculatorCalculate the original 1996 Classic SOFA-1 score from the worst eligible values in one defined 24-hour window, with an optional comparable-baseline change.

Sepsis & systemic response

Use adult qSOFA or historical adult SIRS as limited prompts, not as independent sepsis diagnoses or universal screening rules.

Adult qSOFA Calculator (Sepsis-3)Calculate the original adult Sepsis-3 qSOFA prognostic prompt from respiratory rate, altered mentation, and systolic blood pressure.Classic SIRSClassic Adult SIRS Criteria Calculator (1992)Count the classic 1992 adult systemic inflammatory response criteria from submitted measurements, without diagnosing sepsis.

Neurologic & sedation assessment

Choose GCS for its eye, verbal, and motor assessment or RASS for the adult ICU observation-to-stimulation sequence.

GCS Calculator (Glasgow Coma Scale)Record the standard adult Glasgow Coma Scale eye, verbal, and motor responses, including documented not-testable components without creating a misleading total.Adult RASS Assessment (Richmond Agitation–Sedation Scale)Describe adult observed agitation or sedation with the original RASS assessment sequence.

Hemodynamics, burns & resuscitation

Use traditional shock index, adult Rule-of-Nines TBSA, or classic Parkland arithmetic only with the measurements, assumptions, and formula limits stated on each page.

Traditional Shock Index Calculator (HR/SBP)Calculate traditional adult Shock Index from paired heart rate and systolic blood pressure.Adult Burn TBSA Calculator (Rule of Nines)Estimate qualifying adult burn total body surface area with classic Rule of Nines anterior and posterior segments.Classic Parkland Formula for Adult BurnsCalculate the classic adult Parkland 4 mL/kg/%TBSA first-24-hour crystalloid estimate and its fixed 50/50 formula allocation.

Match the score to the acute-care question

  • Confirm whether the task is disease-specific assessment, severity or organ dysfunction, a sepsis or systemic-response prompt, neurologic observation, or arithmetic for hemodynamics and burns.
  • Confirm the model’s observation window: admission values, worst values, first 24 hours, or a current structured assessment are not interchangeable.
  • Treat qSOFA as a limited prompt and SIRS as a historical criteria set rather than independent sepsis diagnoses. Sedation, instability, confounders, and findings outside the model require separate clinical assessment.

Important limits

  • No result independently diagnoses a disease, sepsis, shock, organ failure, or another acute condition.
  • Burn and resuscitation calculators perform the stated arithmetic and do not generate a prescription, disposition, or treatment plan.
  • These pages do not select testing, medication, fluids, monitoring, referral, admission, or discharge.

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