What is the average erect penis size?

The average erect length is 13.12 cm (about 5.17 in) and the average erect girth is 11.66 cm (about 4.59 in), based on Veale et al. 2015, a review of measurements from over 15,000 men published in BJU International. Those are the reference figures this visualizer draws beside your own.

How do I measure length and girth accurately?

Measure length along the top, from the pubic bone to the tip, pressing the ruler gently into the fat pad at the base. Measure girth with a soft tape around the thickest part of the shaft. Measure erect, at a comfortable room temperature, and take two or three readings on different days because normal variation is real.

Is the drawing really to scale?

Yes. The visualizer computes one pixels-per-centimeter scale factor sized so the largest item fits the frame, then draws every item with that same factor. Your measurement, the study average, and the comparison object are all on identical footing, which is the whole point.

Why is width drawn from girth divided by pi?

Girth is a circumference, and circumference divided by pi gives the diameter of a circle with that circumference. The silhouettes are simplified capsules, not anatomy, so treating the cross-section as a circle is the honest way to turn a tape measurement into a drawn width.

Does size matter to partners?

Far less than most men fear. In published preference research, partners consistently rank size well below about a dozen other qualities, including attentiveness, communication, and overall connection. The visualizer is for calibrating your sense of the numbers, not for delivering a verdict on you.

Is anything I enter here stored or sent anywhere?

No. The math and the drawing run entirely in your browser, and nothing you type is stored or transmitted by us. The share link encodes your inputs in the URL so the drawing can be reproduced, so only share that link if you want someone to see those numbers.

Penis Size Visualizer: See Measurements to Scale

Enter erect length and girth, pick an everyday object for scale, and get a to-scale side-by-side drawing of your measurement, the study average, and that object. Nothing you type is stored.

What this page does, and why it exists

You already have the numbers. What you probably do not have is a feel for them, because a tape measure reading is an abstraction. This shows the numbers to scale, side by side with objects you already know. It exists because '14 centimeters' means nothing to the human brain and 'about the length of a dollar bill' means everything. What it can't show you: that partners consistently rank size far below about a dozen other things in published preference research. The visualizer is for calibration, not verdicts.

The drawing is deliberately not anatomical. Each measurement is rendered as a clean capsule outline with dimension labels, the way an engineer would sketch a part. You get the honest geometry without anything you would mind having on screen at work, and the result stays hidden behind a blur until you choose to reveal it.

How the scale rendering works

Everything in the drawing shares one scale factor. The visualizer looks at the tallest and widest item in your comparison (your measurement, the study average, and the object you picked), then computes the largest pixels-per-centimeter value that still fits everything inside the frame. Every outline is then drawn with that single factor, so a centimeter is the same number of pixels everywhere in the picture. That is what "to scale" means, and it is the only way a side-by-side comparison is honest.

Width comes from your girth measurement. Girth is a circumference, so the drawn width is girth divided by pi, which is the diameter of a circle with that circumference.

The formula

drawn width = girth ÷ π | scale = the largest px-per-cm value that fits every item in the frame

Girth is the measured circumference in your chosen unit, pi is 3.14159, and the scale factor is applied identically to your measurement, the study average, and the comparison object.

Worked example

Say you enter 5.5 in length and 4.7 in girth. Converted, that is 13.97 cm long with an 11.94 cm girth, so the drawn width is 11.94 ÷ 3.14159, which is about 3.8 cm. The study average drawn beside it is 13.12 cm long with an 11.66 cm girth (a 3.7 cm drawn width), from Veale et al. 2015 in BJU International. Next to a 15.6 cm dollar bill, both capsules come up a little short of the bill, and they are nearly the same size as each other. That last part is the usual surprise.

Why to-scale beats raw numbers

Human perception is terrible at converting units into felt size, and it is even worse when the topic carries anxiety. Study after study on self-perception finds that men estimate the average to be larger than it actually is, then judge themselves against the inflated estimate. Seeing the real average drawn at the same scale as a soda can or a dollar bill resets that baseline in a way a table of numbers never will. Differences that sound significant spoken aloud often turn out to be a few millimeters of ink on screen.

Honest limits

The average we draw comes from Veale et al. 2015, a review of clinician-measured data from over 15,000 men published in BJU International. It is the best single reference available, but it is one study population, and self-measurement at home introduces its own error in both directions. The capsule silhouette is a simplification: real anatomy is not a uniform cylinder, so the drawn width is an idealized diameter, not a portrait. And the comparison objects use typical retail dimensions; your phone may differ by a few millimeters. Treat the drawing as a well-built estimate, not a measurement instrument. Figures reflect the published study data as of July 2026.

Privacy

Nothing you type here is stored or sent anywhere by us. The calculation and the drawing run entirely in your browser. One thing to know: the share link encodes your inputs in the URL so the drawing can be reproduced, so share it knowingly. If you want the comparison without the numbers attached, share the page address without the link the share button generates.

Where to go next

If you want context rather than a picture, the penis size percentile calculator places your measurement in the study distribution. The average penis size chart lays out the published figures by measurement type. And if there is a practical reason you are measuring, the condom size calculator turns girth into a nominal width recommendation, which is the number that actually matters for fit.

Penis Size Visualizer