Surprised? Well, that’s the science, and they’re not interested in lying to you. If that conflicts with your expectations, you need to remember that men have a tendency to exaggerate their size and that exaggeration rubs off on women too. Science cares about the truth, not feelings.

With our average number set, we can look at the standard deviation (a measure of how much variation there is in the dataset) and extrapolate out just how rare a big penis actually is. Half a standard deviation above and below the median gets us a central “average” range, which covers the middle 40% of dicks: 13.2-15.0 cm / 5.2-5.9 inches.

From there, we can extrapolate out, stepping out by standard deviations to go up and down the range of penis lengths.

Erect penis length chart

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

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

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.

How to measure your penis

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