Free tool

Penis Size Percentile Calculator

Based on Veale et al. 2015 · nothing you type leaves your browser

Enter your measurements below and you will see where they sit in the distribution. The comparison uses Veale et al. 2015, BJU International — a review of up to 15,521 men whose measurements were taken by health professionals, not self-reported. That distinction is the whole point: self-reported figures run consistently higher, which is why most numbers you have seen online are too big.

How to read the result

A percentile says how many men out of a hundred measure less than you. The 50th percentile is the exact middle. Anything from roughly the 15th to the 85th is ordinary variation — that band holds about seven men in ten.

The number is only as good as the measurement behind it, and most measurements are wrong in the same direction. The studies use bone-pressed erect length: the ruler is pressed into the pubic bone until it meets resistance. The figure that circulates online is usually taken without that pressure, which adds anywhere from a few millimetres to well over a centimetre depending on body composition. If you measured the second way and compared against the first, you would flatter yourself by a whole band. The measurement guide walks through it properly, including the mistakes that make your own number jump around from week to week.

What the number does not tell you

In a survey of 52,031 people, 85% were satisfied with their partner’s size — while only 55% of men were satisfied with their own. Both figures come from the same dataset. The gap between them is not a measurement problem, and no percentile will close it.

If your erect length comes out under about 3.53 inches, that is roughly two and a half standard deviations below the measured mean — unusual enough to be worth raising with a doctor. One caveat so this is not read as more than it is: the clinical definition of an abnormally small penis is set on stretched flaccid length, not erect length, so this calculator cannot check it. Treat the flag as a reason to ask, not as an answer.

Questions

What is the average penis size?

Across studies that used measurements taken by health professionals rather than self-reports, the average erect length is 5.17 inches (13.12 cm) and the average erect girth is 4.59 inches (11.66 cm). Those figures come from Veale et al. 2015, a review covering up to 15,521 men.

Why is this calculator giving me a lower percentile than others?

Most numbers circulating online come from self-reported surveys, which run consistently higher than clinical measurement. This calculator compares you against professionally measured data, so a given number lands at a lower percentile here than on a calculator built from self-reports. The percentile you get here is the more accurate one.

How should I measure before using this?

Measure erect, with the ruler pressed against the pubic bone until it meets resistance — this is called bone-pressed erect length, and it is the standard used in the studies behind this calculator. Measure girth around the middle of the shaft with a flexible tape, without pulling it tight.

Is my measurement saved or sent anywhere?

No. The calculation runs entirely in your browser. Nothing you type is transmitted, stored on a server, or written to your device beyond your choice of units.

What percentile is considered normal?

Anything between roughly the 15th and 85th percentile is ordinary variation. In a survey of 52,031 people, 85% of respondents were satisfied with their partner’s size while only 55% of men were satisfied with their own — which suggests the gap is usually one of perception rather than measurement.

Source: Veale et al. 2015, BJU International — Systematic review of up to 15,521 men, measured by health professionals.