Testicle Volume Estimator
Enter the length, width and height of each testis to estimate volume with the Lambert formula used in ultrasound research. We deliberately removed the old “percentile” because the site did not have a defensible population distribution for it.
Your measurements
Measure each side separately. The formula is 0.71 × length × width × height.
Left testis
Right testis
Clinical context
Reference values depend strongly on the formula and method. That is exactly why the old percentile was misleading.
Why we removed the percentile
No universal distribution
Testicular volume varies with age, population, fertility status and measurement method. A single universal adult percentile table would overstate precision.
Formula changes the answer
Clinical studies show 0.52 and 0.71 multipliers can produce materially different volumes from the same dimensions.
Asymmetry needs context
One side being somewhat different is not automatically disease. Pain, a new lump, sudden swelling or a meaningful new change deserves clinical evaluation rather than calculator interpretation.
Sources
- Pilatz et al. — adult ultrasonographic reference values.
- Correlation of orchidometer and ultrasonographic testis volume in adults — used the 0.71 × L × W × H formula.
- Comparison of ultrasound formulas with true testicular volume — Lambert formula had smaller mean bias than the 0.52 ellipsoid formula in this small validation study.
- European Association of Urology male infertility guideline — orchidometer and ultrasound context.