Calculate prostate volume using the ellipsoid formula from transrectal ultrasound (TRUS) measurements. Also estimates PSA density for clinical assessment.
Ultrasound Dimensions (cm)
PSA Level (optional)
Results
Volume = π/6 × W × H × L
(Simplified to: 0.52 × W × H × L)
PSA Density = PSA ÷ Volume
PSAD > 0.15: Biopsy recommended
The prostate volume calculator uses the prolate ellipsoid formula (π/6 × W × H × L, simplified to 0.52 × W × H × L) to estimate prostate volume from transrectal ultrasound dimensions. Prostate volume is important for assessing BPH severity, calculating PSA density, and planning treatment strategies including medication dosing and surgical approaches.
A normal prostate volume is approximately 20–30 mL (cc) in men under 50. Prostate volume naturally increases with age due to benign prostatic hyperplasia (BPH). Volumes above 30–40 mL are considered enlarged and may be associated with lower urinary tract symptoms.
PSA density (PSAD) is calculated by dividing the serum PSA level by the prostate volume. A PSAD greater than 0.15 ng/mL/cc is considered suspicious for prostate cancer and may warrant further evaluation with biopsy, especially in men with PSA levels in the "gray zone" (4–10 ng/mL).