Most guys searching for "average penis size" are really just looking for the answer to one question: "Am I normal?"
The short answer? Yes, you probably are. "Normal" is a massive range, but pop culture has done us dirty by inflating what "average" looks like compared to what actual clinical science says.
If you’re going to compare yourself to the data, you’ve got to make sure you’re measuring the same way the pros do. Here’s the breakdown of what the numbers actually show and how to get an accurate read on yourself.
The Numbers: What is "Average" Anyway?

If you look at large-scale clinical studies (the kind where doctors do the measuring, not just guys filling out surveys), the numbers are usually lower than what you see in movies:
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Average Erect Length: Usually sits right around 5.1 to 5.5 inches (13–14 cm).
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Average Erect Girth (Circumference): Usually clocks in at about 4.8 inches (12.2 cm) at the widest point.
The "Self-Reporting" Bias: Many of the 6-inch+ stats you see online come from studies where participants measured themselves. Let’s be real—men tend to be a little "generous" when reporting their own stats. When clinicians take over with standardized tools (and sometimes injections like Prostaglandin or TriMix to ensure a 100% erect state), the average consistently lands closer to that 5-inch mark.
How to Measure Properly (No Cheating!)
If you want to know where you stand, follow the clinical standard:
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Length: Stand up straight with a full erection. Use a rigid ruler. Press it firmly against your pubic bone (push past any fat pad) and measure to the very tip of the head.
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Girth (Width): Use a flexible measuring tape or a piece of string. Wrap it around the thickest part of the shaft while erect.
Erect penis length chart
| classification | cm | inches | percentile | vs. average |
|---|---|---|---|---|
| micropenis | <8.1 cm cm | <3.2 inches | <0.02 | >42% shorter |
| very small | 8.1-9.8 cm | 3.2-3.9 inches | 0.02%-0.6% | 42-29% shorter |
| small | 9.8-11.5 cm | 3.9-4.5 inches | 0.6-7% | 29-18% shorter |
| below average | 11.5-13.2 cm | 4.5-5.2 inches | 7-30% | 18-5% shorter |
| average | 13.2-15.0 cm | 5.2-5.9 inches | 30-70% | 5% shorter – 5% longer |
| above average | 15.0-16.7 cm | 5.9-6.6 inches | 70-93% | 5-18% longer |
| big | 16.7-18.4 cm | 6.6-7.3 inches | 93-99.4% | 18-29% longer |
| huge | 18.4-20.2 cm | 7.3-7.9 inches | 99.4-99.98% | 29-42% longer |
| enormous | 20.2-21.9 cm | 7.9-8.6 inches | 99.98-99.999% | 42-56% longer |
| truly massive | >21.9 cm | >8.6 inches | >99.999% | >56% longer |
Erect Girth
But.. let us not forget about girth. If anything, girth is the more impactful of dimensions, versus length. CalcSD's dataset points to the average penis measuring 11.5 cm / 4.5 inches in circumference at its thickest point, which gives us an average range of 10.8-12.1 cm / 4.3-4.8 inches covering the middle 40% of dicks.
Extrapolating out again from that point, we can define the range of girths.
Accurate girth data is especially important for proper condom sizing, as those are sized based on the dick's thickness, not length.
Erect penis girth chart
| classification | cm | inches | percentile | vs. average |
|---|---|---|---|---|
| micropenis | <7.1 cm | <2.8 inches | <0.02% | >37% thinner |
| very small | 7.1-8.3 cm | 2.8-3.3 inches | 0.02-0.6% | 37-26% thinner |
| small | 8.3-9.6 cm | 3.3-3.8 inches | 0.6-6% | 26-16% thinner |
| below average | 9.6-10.8 cm | 3.8-4.3 inches | 6-30% | 16-6% thinner |
| average | 10.8-12.1 cm | 4.3-4.8 inches | 30-70% | 6% thinner – 6% thicker |
| above average | 12.1-13.4 cm | 4.8-5.3 inches | 70-94% | 6-16% thicker |
| big | 13.4-14.6 cm | 5.3-5.8 inches | 94-99.4% | 16-26% thicker |
| huge | 14.6-15.9 cm | 5.8-6.3 inches | 99.4-99.98% | 26-37% thicker |
| enormous | 15.9-17.1 cm | 6.3-6.8 inches | 99.98-99.999% | 37-51% thicker |
| truly massive | >17.1 cm | >6.8 inches | >99.999% | >51% thicker |
Flaccid Size
So now you know how your hard-on fits into the grand scheme of penises, but what about when soft? While flaccid measurements vary all over the place all day long, we still know what our "typical" softie is like. But is it normal? And are you a grower or a shower?
Science has an answer there too: the average flaccid penis measures 9.0 cm / 3.5 inches long. The bell curve on penis size is even narrower on soft measurements, with a central standard deviation covering 60% of flaccid penises for an average range of 3.3-3.8 inches / 8.3-9.7 cm.
Flaccid penis length chart
| classification | cm | inches | percentile | vs. average |
|---|---|---|---|---|
| tiny | <4.1 cm | <1.6 inches | <0.03% | >54% shorter |
| very small | 4.1-5.5 cm | 1.6-2.2 inches | 0.03-0.7% | 54-39% shorter |
| small | 5.5-6.9 cm | 2.2-2.7 inches | 0.7-7% | 39-23% shorter |
| below average | 6.9-8.3 cm | 2.7-3.3 inches | 7-30% | 23-8% shorter |
| average | 8.3-9.7 cm | 3.3-3.8 inches | 30-70% | 8% shorter – 8% longer |
| above average | 9.7-11.1 cm | 3.8-4.4 inches | 70-93% | 8-23% longer |
| big | 11.1-12.5 cm | 4.4-4.9 inches | 93-99.2% | 23-39% longer |
| huge | 12.5-13.9 cm | 4.9-5.5 inches | 99.2-99.97% | 39-54% longer |
| enormous | 13.9-15.3 cm | 5.5-6 inches | 99.97-99.999% | 54-70% longer |
| truly massive | >15.3 cm | >6 inches | >99.999% | >70% longer |
Like soft length, science also has an answer for soft girth. It can be a little squishy to measure, but the same principles apply. With thousands of penis measurements to run numbers off of, we can confidently say that the average soft penis has a girth of 9.0 cm / 3.5 inches. There's typically not a lot of variation in flaccid circumference, so the average range of 8.5-9.4 cm / 3.3-3.7 inches covers the middle 60% of men.
Flaccid penis girth chart
| classification | cm | inches | percentile | vs. average |
|---|---|---|---|---|
| tiny | <5.6 cm | <2.2 inches | <0.02% | >37% thinner |
| very small | 5.6-6.6 cm | 2.2-2.6 inches | 0.02-0.6% | 37-27% thinner |
| small | 6.6-7.5 cm | 2.6-3.0 inches | 0.6-7% | 27-16% thinner |
| below average | 7.5-8.5 cm | 3.0-3.3 inches | 7-30% | 16-5% thinner |
| average | 8.5-9.4 cm | 3.3-3.7 inches | 30-70% | 5% thinner – 5% thicker |
| above average | 9.4-10.4 cm | 3.7-4.1 inches | 70-93% | 5-16% thicker |
| big | 10.34-11.3 cm | 4.1-4.5 inches | 93-99.4% | 16-27% thicker |
| huge | 11.3-12.3 cm | 4.5-4.8 inches | 99.4-99.98% | 27-37% thicker |
| enormous | 12.3-13.2 cm | 4.8-5.2 inches | 99.98-99.999% | 37-48% thicker |
| truly massive | >13.2 cm | >5.2 inches | >99.999% | >48% thicker |
How to measure
Measuring your dick is straightforward, and yet full of complications. In the simplest form, to measure length you should you place a ruler on top of your erect penis, press into the pubic fat until it stops at the bone, and then note the measurement at the end. To measure girth, wrap a soft measuring tape or a strip of paper around the thickest part of your penis.
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