Calwarden

Prostate Volume Calculator (Ellipsoid)

Calculate prostate volume using the ellipsoid formula.

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Inputs

cm
cm
cm

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Results

Volume
Est. Weight24.7

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Assumptions

  • The gland is modeled as an ellipsoid, so irregular contour or zonal asymmetry can make the estimate less exact.
  • The result depends on consistent plane selection and measurement technique on the source exam.
  • Volume is one part of assessment and should not be interpreted as a diagnosis by itself.

Sensitivity preview

Width (Transverse) -10%: Volume 22.2 cc

Width (Transverse) Current: Volume 24.7 cc

Width (Transverse) +10%: Volume 27.2 cc

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About this Prostate Volume

The prostate gland is roughly ellipsoid in shape. Radiologists and urologists measure the gland in three orthogonal dimensions (Width, Height, Length) using Ultrasound or MRI to estimate its volume in cubic centimeters (cc or mL).

Who this calculator is for

  • Radiologists, sonographers, urology teams, and trainees reviewing measured prostate dimensions.
  • People who already have width, height, and length from ultrasound or MRI.
  • Learners studying how prostate size estimates support downstream discussions like PSA density.

When to use it

  • Use this calculator after obtaining orthogonal prostate measurements from imaging.
  • Use it to quickly estimate gland volume when dictating or checking a report.
  • Use it in educational settings when explaining the standard ellipsoid approximation.

How to use this calculator

  1. Measure Width (Transverse dimension).
  2. Measure Height (Anteroposterior dimension).
  3. Measure Length (Longitudinal/Craniocaudal dimension).
  4. The calculator applies the standard coefficient (0.52).

Key assumptions

  • The gland is modeled as an ellipsoid, so irregular contour or zonal asymmetry can make the estimate less exact.
  • The result depends on consistent plane selection and measurement technique on the source exam.
  • Volume is one part of assessment and should not be interpreted as a diagnosis by itself.

Accuracy and testing

Review formula sources, default test cases, assumptions, unit handling, rounding rules, and changelog for this calculator.

View accuracy page

How this calculator works

Volume = Width × Height × Length × 0.52 The factor 0.52 comes from the ellipsoid volume formula: $\frac{\pi}{6} \approx 0.523$.

Inputs explained

Dimensions

Measurements taken from imaging. Order does not matter for the calculation, but consistent labeling helps tracking.

Understanding your results

The result gives an estimated gland volume in cc/mL. Larger volumes are often discussed alongside symptoms, PSA, and exam context rather than used in isolation.

Key Features

  • Instant Calculation
  • Private & Secure
  • Mobile Optimized

Tips & Best Practices

  • Prostate specific antigen (PSA) density can be calculated by dividing serum PSA by prostate volume and interpreted with the broader clinical picture.
  • Weight in grams is roughly equivalent to Volume in cc (density ~1 g/cc).

Frequently Asked Questions

What is a normal prostate size?
A normal prostate volume for a young adult is around 20-25 cc. It typically grows with age; a volume > 30 cc is often considered enlarged (BPH).
Why 0.52?
The formula for an ellipsoid is (Width × Height × Length) × (π/6). Pi divided by 6 is approximately 0.523, which is rounded to 0.52 in clinical practice.