Penis Size Calculator: Length, Girth & Average
Enter your erect length and mid-shaft circumference to compare each measurement with the reference distributions used by this calculator. Results are estimates, not exact counts of men worldwide or a medical diagnosis. The methodology page explains the research and assumptions behind the comparisons; use the measurement guide if you want to check your measurements first.
How to calculate your penis percentile
Enter erect length and mid-shaft circumference, using the same measurement method described in our measurement guide. The calculator estimates length and circumference percentiles separately against its reference distributions. Percentiles depend on the model and should not be interpreted as exact worldwide rankings.
Is my penis average? What the numbers show
Published averages provide context, not a boundary between normal and abnormal. The 2015 systematic review reported mean erect length of 13.12 cm and mean erect circumference of 11.66 cm, using different sample sizes for each measure. Compare like with like and read the methodology before interpreting a result.
Where do you rank compared to other men?
The calculator can put a measurement into context using the reference distribution described in the methodology. It cannot measure sexual function, predict a partner’s preferences or establish a medical diagnosis. If the result concerns you, check that your measurements were taken consistently before drawing conclusions.
My Size Report provides a private, calculator-led way to understand measurements against published research. Results are informational and should not be treated as medical advice.