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PSA per Prostate Volume

Relate PSA density to serum PSA and measured or ellipsoid-estimated prostate volume.

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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Use the result with context

Health results are educational estimates, not a diagnosis or treatment recommendation. A qualified clinician can interpret measurements in the context of your health.

Formula and method

PSA 4 ng/mL and prostate volume 40 mL give PSA density 0.1 ng/mL per mL of prostate.

PSA density = PSA (ng/mL) / prostate volume (mL); ellipsoid volume = πLWH/6.

Worked example

Enter these known values and leave the other values blank.

Prostate volume
40 cm³
PSA
4 ng/mL
PSA density (ng/mL per mL prostate)
0.1 **ng/mL²**

Assumptions and limitations

  • Measured volume can be entered directly, or estimated from three orthogonal diameters in cm using an ellipsoid. Density uses PSA ng/mL per mL of prostate. Imaging and shape uncertainty affect estimates; no biopsy or cancer-risk decision is provided.
  • Use the displayed units and measurements from the same context. Editable fields support arithmetic inverses when enough independent values are supplied. Clear a preset value before solving it as an unknown.
  • This tool performs the stated arithmetic model. It does not establish a diagnosis, prescribe treatment or replace laboratory and clinical assessment.

Common questions

What does this calculation represent?

Measured volume can be entered directly, or estimated from three orthogonal diameters in cm using an ellipsoid. Density uses PSA ng/mL per mL of prostate. Imaging and shape uncertainty affect estimates; no biopsy or cancer-risk decision is provided.

Can I solve for a different field?

Clear the unknown field and enter enough independent values in the remaining editable controls. A relationship cannot recover a unique value when a dividing quantity is zero.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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