Prostate Volume Calculator

Category: Other Health
- May 15, 2025
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Calculate prostate volume and PSA density using transrectal ultrasound (TRUS), MRI, or CT measurements. This tool helps in the assessment of benign prostatic hyperplasia (BPH) and risk stratification for prostate cancer.

Prostate Measurements

Measure from base to apex
Maximum transverse diameter
Measure on sagittal/mid-transverse plane
Method used to obtain measurements

PSA Information

ng/mL
Total Prostate Specific Antigen
years

About Prostate Volume & PSA Density

Prostate volume and PSA density are important metrics in the assessment of prostate conditions, including benign prostatic hyperplasia (BPH) and prostate cancer risk stratification.

Prostate Volume Formulas
  • Ellipsoid Formula: Volume = Length × Width × Height × π/6 (or 0.523)
  • Bullet Formula: Volume = Length × Width × Height × 5π/24 (or 0.655)
  • The Bullet formula may be more accurate for prostates smaller than 55 cc
Normal Prostate Volume
  • Normal: 20-30 cc
  • Mild Enlargement (BPH): 30-50 cc
  • Moderate Enlargement: 50-80 cc
  • Marked Enlargement: >80 cc
PSA Density
  • PSA Density = PSA (ng/mL) ÷ Prostate Volume (cc)
  • Lower values are associated with benign conditions
  • Higher values may indicate increased risk for prostate cancer
  • Common threshold: 0.15 ng/mL/cc
Clinical Applications
  • Assist in distinguishing between benign prostatic hyperplasia and prostate cancer
  • Help decide when prostate biopsy may be necessary
  • Aid in risk stratification of patients with elevated PSA
  • Guide treatment selection for BPH

This calculator is for informational purposes only. Consult with a healthcare professional for medical advice. Prostate volume estimations have inherent limitations in accuracy compared to actual pathological specimens.

Prostate Volume & PSA Density Calculator

This calculator is a practical tool for estimating prostate volume and PSA density based on imaging measurements. These values are key indicators used by healthcare professionals when evaluating prostate Health, particularly in relation to benign prostatic hyperplasia (BPH) and potential prostate cancer risk. It works with data from TRUS, MRI, or CT scans.

Ellipsoid Volume Formula:
Volume = Length × Width × Height × π / 6
Bullet Volume Formula:
Volume = Length × Width × Height × 5π / 24
PSA Density:
PSA Density = PSA (ng/mL) ÷ Prostate Volume (cc)

What This Calculator Does

  • Calculates prostate volume using two common geometric formulas: ellipsoid and bullet.
  • Estimates PSA density based on the entered PSA level and computed volume.
  • Provides a general interpretation of results, helping identify potential prostate enlargement or elevated cancer risk.
  • Displays age-specific PSA reference values to contextualize results.

How to Use the Calculator

  1. Enter the length, width, and height of the prostate as measured on imaging (TRUS, MRI, or CT).
  2. Select the appropriate unit for each dimension (centimeters or millimeters).
  3. Choose the imaging method used for the measurements.
  4. Input the PSA level (ng/mL) and the patient’s age.
  5. Click “Calculate” to generate results.

Understanding the Results

  • Prostate Volume: Helps classify prostate size as normal, mildly, moderately, or markedly enlarged.
  • PSA Density: Indicates the concentration of PSA relative to prostate size. A value above 0.15 ng/mL/cc may suggest higher risk for prostate cancer.
  • Clinical Interpretation: Provides context-specific guidance based on your inputs, including age-referenced PSA thresholds.

Who Can Benefit From This Tool?

This calculator is useful for patients, clinicians, and medical students looking to quickly assess prostate metrics without manual calculations. It simplifies decision-making and helps support discussions around follow-up care or further diagnostic testing.

Why PSA Density and Prostate Volume Matter

  • Prostate volume helps evaluate conditions like BPH, a common issue in aging males.
  • PSA density improves the interpretation of PSA levels by accounting for prostate size.
  • Both metrics assist in identifying men who may benefit from further testing, such as prostate biopsies.

Frequently Asked Questions (FAQ)

What is considered a normal prostate volume?

Typically, 20–30 cc is considered normal. Anything above this may indicate an enlarged prostate.

What PSA density is concerning?

A PSA density of 0.15 ng/mL/cc or greater is generally considered a threshold for increased prostate cancer risk.

Can this replace a doctor’s evaluation?

No. This tool is designed for informational use only. Clinical decisions should always be made by a healthcare provider.

How accurate are these volume calculations?

The formulas provide close estimates based on typical prostate shapes, but actual volumes may differ. The bullet formula is often more accurate for smaller prostates (<55 cc).

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Disclaimer

This calculator provides estimates and should not be used as a substitute for clinical judgment or diagnostic procedures. Always consult a healthcare professional for personalized advice and medical decisions.