# PSA Density Calculator

URL: https://speedycalculator.com/calculators/health/psa-density/
Last updated: 2026-10-30

> The PSA density calculator divides your PSA level by prostate volume to help decide whether a raised PSA is more likely to come from an enlarged prostate or from prostate cancer.

## Inputs

- PSA (ng/mL)
- Prostate volume input
- Prostate volume (mL)
- Length (cm, in, m, ft, mm)
- Width (cm, in, m, ft, mm)
- Height (cm, in, m, ft, mm)

## Results

- Prostate volume
- PSA density

## Formula

```
PSA density = PSA (ng/mL) ÷ prostate volume (mL)
≥ 0.15 ng/mL/cc: higher risk of clinically significant cancer
```

## Explanation

A large prostate produces more PSA, so PSA alone can mislead. PSA density above 0.15 is associated with a higher chance of clinically significant prostate cancer and is used, with MRI findings, to decide on biopsy.

### How to use the PSA Density Calculator

- **PSA**
- **Prostate volume input**
- **Prostate volume**
- **Length**
- **Width**
- **Height**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Enter PSA and the prostate volume from ultrasound or MRI (or its three dimensions).

### Inputs explained

FieldWhat to enterPSAIn ng/mLProstate volume inputChoose one: Volume, Three dimensionsProstate volumeIn mLLengthUnits: cm, in, m, ft, mmWidthUnits: cm, in, m, ft, mmHeightUnits: cm, in, m, ft, mm

### Example values

How the main result changes when **PSA** changes and everything else stays at the example values above:

PSA (ng/mL)PSA density (ng/mL/cc)30.084.50.1160.157.50.1990.23120.3
*Health note: this calculator is for education and screening only and is not a diagnosis or treatment advice. Discuss your results with a qualified clinician.*

## Worked example

Inputs — PSA: 6 ng/mL; Prostate volume input: Volume; Prostate volume: 40 mL.

Results — Prostate volume = 40 mL; **PSA density = 0.15 ng/mL/cc**.

## Key terms

- **PSA**: Prostate-specific antigen.

## FAQ

**What is a normal PSA density?**
Below 0.15 ng/mL/cc, and below 0.10 is reassuring.

**Does a high PSA density mean cancer?**
No – it raises the probability; MRI and biopsy are needed to diagnose cancer.

**How is prostate volume measured?**
By transrectal ultrasound or MRI.


## Sources

- [Benson MC et al. Prostate specific antigen density: a means of distinguishing BPH and prostate cancer. J Urol, 1992](https://pubmed.ncbi.nlm.nih.gov/1371294/)