Prostate Volume Calculator

The prostate volume calculator helps you determine the volume of the prostate gland using transrectal ultrasound (TRUS) measurements. This prostate volume calculator uses the ellipsoid formula to estimate prostate volume, which is essential for diagnosis, treatment planning, and determining PSA density in prostate health assessment.

Enter the prostate dimensions from ultrasound measurements:

Width (cm) *Transverse diameter (1-10 cm)

Height (cm) *Anteroposterior diameter (1-10 cm)

Length (cm) *Longitudinal diameter (1-10 cm)

PSA Value (ng/mL) (optional)For PSA density calculation

How to Use the Prostate Volume Calculator

Our prostate volume calculator is designed for ease of use. Follow these steps to calculate prostate volume accurately:

Enter the Width (transverse diameter) of the prostate in centimeters from ultrasound measurements.
Enter the Height (anteroposterior diameter) of the prostate in centimeters.
Enter the Length (longitudinal diameter) of the prostate in centimeters.
Optionally, enter the PSA Value to calculate PSA density.
Click the Calculate Volume button to get the prostate volume result.
The prostate volume calculator will display the volume in cubic centimeters (cc) or milliliters (ml).
If you provided a PSA value, the prostate volume calculator will also display PSA density and its interpretation.

Prostate Volume Calculator Formula

This prostate volume calculator uses the ellipsoid formula:

Volume = (π/6) × Width × Height × Length

Where all dimensions are measured in centimeters (cm) and the resulting volume is in cubic centimeters (cc) or milliliters (ml).

Understanding Prostate Volume Calculator Results

Interpreting results from the prostate volume calculator is essential for clinical assessment and treatment planning:

Normal Prostate Volume

A normal adult prostate typically has a volume of 20-30 cc. The prostate naturally enlarges with age, so what's considered normal varies across age groups.

Enlarged Prostate (BPH)

A prostate volume between 30-80 cc indicates benign prostatic hyperplasia (BPH), a common non-cancerous enlargement in older men that may cause urinary symptoms.

Significantly Enlarged Prostate

A prostate volume exceeding 80 cc is considered significantly enlarged and may require medical intervention, especially if causing severe urinary symptoms.

PSA Density Interpretation

PSA density is calculated by dividing PSA value by prostate volume. A PSA density greater than 0.15 ng/mL/cc may indicate a higher risk of prostate cancer and may warrant further investigation.

Clinical Applications of the Prostate Volume Calculator

The prostate volume calculator has several important clinical applications:

BPH Diagnosis and Management

The prostate volume calculator provides accurate measurements that help diagnose benign prostatic hyperplasia (BPH) and guides treatment decisions, including medication dosing and surgical planning.

PSA Interpretation

Results from the prostate volume calculator help contextualize PSA levels through PSA density calculation, improving the specificity of PSA testing for prostate cancer detection.

Treatment Planning

Measurements from the prostate volume calculator inform treatment approaches for various prostate conditions, including radiation therapy planning, brachytherapy seed calculations, and surgical strategy development.

Monitoring Disease Progression

Serial measurements using the prostate volume calculator can help monitor disease progression or treatment response over time for both benign and malignant conditions.

Frequently Asked Questions About the Prostate Volume Calculator

What is considered a normal prostate size when using the prostate volume calculator?

When using our prostate volume calculator, a normal adult prostate typically has a volume of 20-30 cubic centimeters (cc). However, prostate size naturally increases with age, so normal values vary by age group. In younger men (30-40 years), volumes of 20-25 cc are typical, while in older men (60+ years), volumes up to 30-40 cc may still be considered normal.

How accurate is the prostate volume calculator using the ellipsoid formula?

The prostate volume calculator using the ellipsoid formula (π/6 × width × height × length) provides a reasonable estimate with about 10-20% margin of error compared to prostatectomy specimens. It is widely used in clinical practice due to its simplicity and reasonable accuracy when measurements are taken carefully.

Can the prostate volume calculator help diagnose prostate cancer?

The prostate volume calculator alone cannot diagnose prostate cancer. However, when combined with PSA testing to calculate PSA density (PSA ÷ prostate volume), it improves the specificity of cancer detection. A PSA density greater than 0.15 ng/mL/cc raises suspicion for prostate cancer and may warrant further investigation.

Does prostate volume affect medication dosing?

Yes, measurements from the prostate volume calculator can influence medication dosing for BPH treatments. For example, 5-alpha reductase inhibitors like finasteride and dutasteride are more effective in prostates larger than 40 cc as measured by a prostate volume calculator, while alpha-blockers are usually effective regardless of prostate size.

How often should I use the prostate volume calculator?

For men with prostate conditions requiring monitoring, using the prostate volume calculator might be recommended annually or biannually. The frequency depends on the specific condition, symptoms, treatment plan, and rate of change in previous measurements. Your healthcare provider can recommend an appropriate schedule for using the prostate volume calculator.