APACHE II Score Calculator

Health

The APACHE II Score Calculator adds up the individual point scores of a critically ill patient to give a severity-of-disease score and a rough estimate of in-hospital mortality. This is a simplified version that sums the points you enter for each component. The formula used is: APACHE II score = sum of all component points.

Rates and fees change frequently. Always confirm the current figures with the official authority before relying on this result.

Formula

Sum of component scores
  • The APACHE II Score Calculator updates instantly as you change any component's points.
  • Formula: APACHE II score = sum of all component points
  • Input definitions: • Age Points: points assigned for the patient's age band • Temperature Points: points for the worst temperature reading • Heart Rate Points: points for the worst heart rate • Systolic BP Points: points for the worst mean arterial / systolic pressure
  • The full APACHE II uses 12 physiologic variables plus age and chronic health points; this tool sums the components you provide.
  • Higher total scores indicate more severe illness and a higher estimated mortality risk.
  • Mortality bands here are approximate and for orientation only — confirm with the full validated scoring tool.

Example Calculation

Inputs
  • Age Points: 3
  • Temperature Points: 2
  • Heart Rate Points: 2
  • Systolic BP Points: 1

Entering age 3, temperature 2, heart rate 2, and systolic BP 1 gives an APACHE II score of 8, which falls in the lower mortality band (around 8%).

Frequently asked questions

What is the APACHE II score?
APACHE II (Acute Physiology and Chronic Health Evaluation II) is an ICU severity-of-illness score. Higher totals indicate sicker patients and higher estimated mortality.
How is the score calculated?
It is the sum of points for each physiologic variable, plus points for age and chronic health. This simplified tool adds the component points you enter.
How is mortality estimated?
This tool maps the total score to broad mortality bands as a rough guide. Published APACHE II tables give more precise risk estimates.
Is this the complete APACHE II?
No. The full score uses 12 physiologic measurements plus age and chronic health adjustments. Use a validated clinical tool for real assessments.
Who should use this?
It is intended for clinicians as an educational aid. It does not replace formal scoring or clinical judgement.