Quick answers
Direct, data-backed answers to the size questions people actually ask.
What is the average penis size in inches?
The average erect penis is 5.16 inches (13.12 cm) long and 4.59 inches (11.66 cm) in girth, based on clinician measurements of 15,521 men (Veale et al., 2015). The median is 5.2 inches, and about 90% of men fall between 4.1 and 6.2 inches erect.
Is 16 cm big?
Yes — 16 cm (6.3 in) erect lands at the 96th percentile in clinician-measured data (Veale 2015), with only about 1 in 24 men, the top 4%, measuring larger.
Does penis size matter to women?
No — size matters far less than most men assume. In studies, women's preferred erect length for a long-term partner is about 16.0 cm (6.3 in), only slightly above the 13.1 cm (5.2 in) average, and most women report being satisfied with their partner's size.
How do you measure your penis correctly?
To measure your penis correctly, measure when fully erect: press a ruler against the pubic bone at the base and measure along the top to the tip for length, and wrap a flexible tape around the thickest part for girth. The clinician-measured average is 13.12 cm (5.16 in) erect length and 11.66 cm (4.59 in) girth.
Is 13 cm big?
No — 13 cm (5.1 in) erect is almost exactly average: the clinician-measured mean is 13.12 cm (Veale 2015, n=15,521), which puts 13 cm at the 47th percentile.
Is 4 inches small?
No, 4 inches is below average but not unusually small. In the largest clinician-measured study (Veale 2015, n=15,521), average erect length is 5.16 inches (13.12 cm), placing 4 inches around the 4th percentile — roughly 1 in 27 men, yet still well above the micropenis threshold.
Is 5 inches below average?
Barely. 5 inches (12.7 cm) is about 0.4 cm under the 13.12 cm average — roughly the 40th percentile, well inside the normal range.
Is 5.5 inches average?
Yes. At 5.5 inches (14 cm) erect, you're above average — around the 70th percentile, longer than roughly 7 in 10 men. The clinician-measured average erect length is 5.16 inches (13.12 cm).
Is 20 cm big?
Yes — 20 cm (7.9 in) erect corresponds to the 99.998th percentile, roughly 1 in 59,000 men in the statistical model, so verified cases are exceptionally rare.
Is 5 inches of girth big?
Yes. A 5-inch (12.7 cm) erect girth is bigger than average and sits around the 83rd percentile, meaning it's thicker than roughly 4 out of 5 men. The average erect girth is 4.59 inches (11.66 cm).
Is 5 inches small?
No, 5 inches is not small. At about 5 inches erect, you're right around the 40th percentile — essentially average, since the clinically measured average erect length is 5.16 inches (13.12 cm).
Is 6 inches average?
Yes — 6 inches (15.2 cm) is at roughly the 90th percentile for erect length, so it's above average, not average. The clinician-measured average erect penis is about 5.2 inches (13.12 cm), based on Veale et al. 2015 (n=15,521).
Is 6 inches big?
Yes — 6 inches (15.2 cm) erect is above average. Only about 10% of men exceed it, placing 6 inches around the 90th percentile.
Is 8 inches big?
Yes — 8 inches is exceptionally big. With an average erect length of about 5.2 inches (13.1 cm), an 8-inch erection is rarer than 1 in 10,000 men.
Is bigger always better?
No — bigger is not always better. The average erect penis is 13.12 cm (5.16 in) long, and roughly 90% of men fall between 10.4 and 15.9 cm (4.1–6.2 in), with most partners reporting satisfaction at sizes only slightly above average.
Is 7 inches big?
Yes — 7 inches (17.8 cm) is very big. It sits around the 99.7th percentile for erect length, meaning roughly 1 in 400 men reach it, far above the 5.2-inch (13.1 cm) average.
Is my penis normal?
For most men, yes. The average erect penis is 13.1 cm (5.2 inches) long, and about 90% of men measure between 4.1 and 6.2 inches erect — so nearly any size in that range is completely normal.
What is a good girth?
A good girth is right around the average of 11.66 cm (4.59 in) erect — and anything from there up is comfortably normal; a 12.7 cm (5 in) girth already sits near the 83rd percentile, putting it in the thick range.
What is considered a small penis?
Clinically, only an erect or stretched length under about 9.3 cm (3.7 in) — a micropenis — is truly small, affecting roughly 0.6% of men. Anything from 10.4 cm (4.1 in) up is within the normal range.
What is considered a big penis?
A penis is generally considered big when its erect length is about 15.2 cm (6.0 in) or more — the 90th percentile, reached by only about 1 in 10 men. The average erect length is 13.12 cm (5.16 in).
What is the average girth?
The average erect girth (circumference) is 11.66 cm (4.59 in), per Veale et al. 2015. Most men fall between about 10 and 13 cm around.
What is the most common penis size?
The most common (average) erect penis size is about 13.1 cm (5.2 inches) in length and 11.7 cm (4.6 inches) in girth, based on clinician measurements of over 15,000 men.
What penis size is in the top 1%?
A penis in the top 1% is about 17.0 cm (6.7 inches) erect or longer — that's the 99th percentile in the largest clinician-measured study. In inch terms, roughly 7 inches puts you near the top 0.3% (about 1 in 400 men).
What percentage of men have a 6-inch penis?
About 10% of men have an erect penis of 6 inches or longer. A 6-inch (15.2 cm) erect length sits at roughly the 90th percentile, so it's well above average and found in only about 1 in 10 men.
What percentage of men are over 7 inches?
Under half a percent. Roughly 1 in 400 men has an erect length over 7 inches (17.8 cm) — it's genuinely rare, despite how common it looks online.
What is the average penis size?
The average erect penis is 13.12 cm (5.16 in) long and 11.66 cm (4.59 in) in circumference, based on clinician-measured data from up to 15,521 men (Veale et al., 2015).
What size do women prefer?
In the best study (3D models, Prause 2015), women preferred about 16 cm (6.3 in) length and 12.2 cm (4.8 in) girth for a long-term partner — slightly above average, with girth mattering as much as length.