What this calculator does
Cerebral perfusion pressure (CPP) works out net pressure driving blood flow to the brain, from blood pressure and intracranial pressure. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
The inputs explained
| Field | What to enter |
|---|---|
| Systolic blood pressure (mmHg) | A number, measured in mmHg. Starts at 120. |
| Diastolic blood pressure (mmHg) | A number, measured in mmHg. Starts at 80. |
| Intracranial pressure (mmHg) | A number, measured in mmHg. Starts at 10. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with systolic blood pressure
Every other input is held at the calculator’s starting values while systolic blood pressure varies. Select any row to load that scenario into the calculator.
| Systolic blood pressure (mmHg) | Cerebral perfusion pressure | Mean arterial pressure used | Typical adult target range |
|---|---|---|---|
| 60 | 63.3 mmHg | 73.3 mmHg | 60 - 80 mmHg |
| 90 | 73.3 mmHg | 83.3 mmHg | 60 - 80 mmHg |
| 120 | 83.3 mmHg | 93.3 mmHg | 60 - 80 mmHg |
| 180 | 103.3 mmHg | 113.3 mmHg | 60 - 80 mmHg |
| 240 | 123.3 mmHg | 133.3 mmHg | 60 - 80 mmHg |
| 360 | 163.3 mmHg | 173.3 mmHg | 60 - 80 mmHg |