What this calculator does
PSA density works out pSA level adjusted for prostate size, used alongside other tests to gauge cancer risk. 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
FormulaPSA density = PSA / prostate volume; volume (ellipsoid) = length × width × height × π/6
The inputs explained
| Field | What to enter |
|---|---|
| PSA level (ng/mL) | A number, measured in ng/mL. Starts at 4. |
| Prostate length (cm) | A number, measured in cm. Starts at 4.5. |
| Prostate width (cm) | A number, measured in cm. Starts at 4. |
| Prostate height (cm) | A number, measured in cm. Starts at 3. |
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 psa level
Every other input is held at the calculator’s starting values while psa level varies. Select any row to load that scenario into the calculator.
How the answer changes with psa level
| PSA level (ng/mL) | PSA density | Prostate volume | Reading |
|---|---|---|---|
| 2 | 0.071 ng/mL/cc | 28.3 cc | Below 0.15: a lower likelihood, though this does not rule out cancer |
| 3 | 0.106 ng/mL/cc | 28.3 cc | Below 0.15: a lower likelihood, though this does not rule out cancer |
| 4 | 0.141 ng/mL/cc | 28.3 cc | Below 0.15: a lower likelihood, though this does not rule out cancer |
| 6 | 0.212 ng/mL/cc | 28.3 cc | 0.15 or higher: often prompts further evaluation |
| 8 | 0.283 ng/mL/cc | 28.3 cc | 0.15 or higher: often prompts further evaluation |
| 12 | 0.424 ng/mL/cc | 28.3 cc | 0.15 or higher: often prompts further evaluation |