Question 1

Is this calculator accurate?

Accepted Answer

Yes, our calculator uses the Veale 2015 meta-analysis (692 men for length, 381 for girth) with proper statistical parameters. While we display 100,000+ total data points across all studies, the percentile calculations require standard deviation values that only Veale provides (Veale et al. 2015, BJU Int). See the Data Methodology section above for geographic limitations.

Question 2

What is the average penis size?

Accepted Answer

Based on the largest meta-analysis (Veale et al. 2015), the average erect penis length is 13.12 cm (5.17 inches) with a standard deviation of 1.66 cm. The average erect circumference is 11.66 cm (4.59 inches) with a standard deviation of 1.10 cm.

Question 3

How do I measure correctly?

Accepted Answer

For length, use a rigid ruler placed on top of the penis, pressing into the pubic bone (bone-pressed measurement) and measuring to the tip. For circumference, use a flexible measuring tape around the thickest part of the shaft when fully erect. This is the standardized method used in all medical studies (Veale et al. 2015, BJU Int; Wessells et al. 1996, J Urol).

Question 4

What percentile is considered "big"?

Accepted Answer

Statistically, anything above the 84th percentile (one standard deviation above mean) could be considered "large." This translates to approximately 14.8 cm (5.8") in length or 12.8 cm (5.0") in circumference. Only 16% of men exceed these measurements (Veale et al. 2015, BJU Int).

Question 5

Do women care about penis size?

Accepted Answer

Research shows that while women express preferences for slightly above-average sizes when selecting from models (Prause et al. 2015, PLOS ONE), 85% report satisfaction with their current partner's size (Lever et al. 2006, Psychology of Men & Masculinity). Studies consistently show that factors like emotional connection, technique, and communication are rated as more important than size for sexual satisfaction (Stulhofer 2006, Arch Sex Behav).

Question 6

Is there variation between countries?

Accepted Answer

Yes, studies show some regional variation. A 2025 meta-analysis found the Americas had the largest average stretched length (14.47 cm), while Asian populations showed slightly smaller averages but higher growth ratios from flaccid to erect states (Mostafaei et al. 2025, Urology Research & Practice). However, variations within populations are much larger than between populations (Veale et al. 2015, BJU Int).

Question 7

What is the difference between bone-pressed and non-bone-pressed measurements?

Accepted Answer

Bone-pressed (BP) measurement involves pressing the ruler into the pubic bone, accounting for the fat pad. Non-bone-pressed (NBP) measures from the skin surface. Medical studies typically use BP measurements for consistency. The difference can be 0.5-2.5 cm depending on body fat percentage (Wessells et al. 1996, J Urol).

Question 8

Can penis size change over time?

Accepted Answer

Penis size typically remains stable after puberty ends (usually by age 18-21). However, factors like weight gain (increasing fat pad), aging (slight length decrease), and certain medical conditions can affect apparent or actual size. Weight loss can reveal more of the penis by reducing the fat pad (Ponchietti et al. 2001, Eur Urol).

Question 9

How reliable is self-reported data?

Accepted Answer

Self-reported measurements are consistently larger than clinical measurements. Studies show men typically overestimate by 1-2 cm in length and 0.5-1 cm in girth. In studies with clinical measurements, mean erect length is 13.12 cm, while self-reported studies show means of 14-16 cm. This calculator only uses data from clinical measurements taken by healthcare professionals (Veale et al. 2015, BJU Int).

Question 10

What about girth vs length importance?

Accepted Answer

Research suggests girth may be slightly more important than length for partner satisfaction, as it provides more stimulation (Eisenman 2001, BMC Women's Health). However, both dimensions contribute to overall size, and extreme values in either dimension are rare. The ideal is proportionality rather than maximizing one dimension (Prause et al. 2015, PLOS ONE).

Question 11

What is micropenis and how common is it?

Accepted Answer

Micropenis is a medical condition defined as an adult stretched penile length ≤9.3 cm (3.67 inches), which is 2.5 standard deviations below the mean. It affects approximately 0.6% of males globally, or about 1.5 per 10,000 male births in North America. The condition is usually caused by hormonal abnormalities during fetal development and can often be successfully treated with testosterone therapy if diagnosed early (Lee et al. 1980, J Pediatrics; Veale et al. 2015, BJU Int).

Question 12

Can you tell penis size from hands, feet, or height?

Accepted Answer

No, body parts are not reliable indicators of penis size. Studies have debunked these myths: A study of 104 men found NO correlation between shoe size and penis length (Shah & Christopher 2002, BJU Int). Height shows only weak correlation. The only statistically significant (but still weak) correlation found is with finger ratio - men with longer ring fingers relative to index fingers showed slightly larger sizes, likely due to prenatal testosterone exposure (Choi et al. 2011, Asian J Androl). Overall, these correlations are too weak to be predictive.

Question 13

Does race or ethnicity affect penis size?

Accepted Answer

Scientific evidence shows minimal differences between racial groups. A comprehensive review found no indication that penis size differs significantly between ethnicities (Veale et al. 2015, BJU Int). When differences are observed, they're typically less than 1 inch and individual variation within any ethnic group far exceeds average differences between groups. The widely-cited Lynn 2013 study has been rejected by the scientific community for using unreliable self-reported data from non-medical sources. Medical consensus: race is not a meaningful predictor of penis size.

Question 14

What causes micropenis?

Accepted Answer

Micropenis is primarily caused by hormonal issues during fetal development, including hypogonadotropic hypogonadism, primary testicular failure, or partial androgen insensitivity syndrome. It can be diagnosed at birth and treated with testosterone therapy during infancy or early childhood with good results (Walsh et al. 2020, J Pediatr Endocrinol Metab).

Question 15

How accurate are online size calculators?

Accepted Answer

Most online calculators lack proper statistical methodology or use self-reported data. Our calculator uses clinically measured data from peer-reviewed studies with proper standard deviations for accurate percentile calculations. Always verify that a calculator cites medical sources and uses measured, not self-reported data.

Question 16

Does circumcision affect penis size?

Accepted Answer

No, circumcision does not affect penis size. Multiple studies have found no difference in erect length or girth between circumcised and uncircumcised men. The procedure only removes the foreskin and does not impact the underlying erectile tissue (Morris & Krieger 2013, Adv Urol).

Question 17

What about penis enlargement methods?

Accepted Answer

No non-surgical method has been proven to permanently increase penis size. Pills, pumps, and exercises lack scientific evidence. Surgical procedures carry significant risks and complications. The medical consensus is that size enhancement claims are generally fraudulent (Campbell & Gillis 2017, Transl Androl Urol).

Question 18

How does age affect penis size?

Accepted Answer

Penis size remains relatively stable from the end of puberty through middle age. Some studies suggest a slight decrease (1-2cm) after age 60 due to decreased elasticity and blood flow. Weight gain with age can also make the penis appear smaller due to increased pubic fat pad (Ponchietti et al. 2001, Eur Urol).

Question 19

What is the normal range for penis size?

Accepted Answer

Statistically, the normal range (within one standard deviation) is 11.46-14.78cm for erect length and 10.56-12.76cm for erect girth. This encompasses about 68% of all men. The medical definition of normal is much broader, including sizes from the 2.5th to 97.5th percentile.

Question 20

Does testosterone affect penis size?

Accepted Answer

Testosterone is crucial for penis development during puberty but doesn't affect size in adults with normal levels. Supplemental testosterone in adults won't increase penis size unless treating a deficiency that occurred before/during puberty (Nieschlag 2020, Eur J Endocrinol).

Question 21

How do medical conditions affect size?

Accepted Answer

Conditions like Peyronie's disease (penile curvature), diabetes (affecting blood flow), and obesity (increased fat pad) can affect apparent or functional size. Erectile dysfunction doesn't change actual size but affects ability to achieve full erection. Most conditions are treatable (Hatzimouratidis et al. 2016, Eur Urol).

Question 22

What is body dysmorphic disorder related to penis size?

Accepted Answer

Small Penis Anxiety (SPA) or penile dysmorphic disorder occurs when men with normal-sized penises have persistent, distressing beliefs that they're inadequate. It affects up to 45% of men seeking enlargement despite normal size. Treatment involves cognitive behavioral therapy, not size enhancement (Veale et al. 2015, J Sex Med).

Question 23

How does weight affect penis size appearance?

Accepted Answer

Excess weight creates a suprapubic fat pad that buries part of the penis shaft, making it appear smaller. For every 30-50 pounds of excess weight, about 1 inch of visible length is lost. This is reversible with weight loss - the actual penis size doesn't change, just the visible portion (Awwad et al. 2005, Int J Impot Res).

Study	Country	Sample Size	Erect Length (cm)	Erect Girth (cm)	Source
Belladelli et al. 2023	Meta-Analysis	55,761	13.93 (95% CI: 13.20-14.65)	Not reported	World Journal of Men's Health
Mostafaei et al. 2025	WHO Regions	36,883	13.84 (SE 0.94)	11.91 (SE 0.18)	Urology Research and Practice
Veale et al. 2015	Meta-Analysis	692	13.12 ± 1.66 SD	11.66 ± 1.10 SD	BJU International
Wessells et al. 1996	USA	80	12.9	12.30	Journal of Urology
Argentina Study 2022	Argentina	800	12.93 (stretched)	Not reported	Asian Journal of Andrology
Nigeria Study 2021	Nigeria	271	10.6-14.1 (stretched)	Not reported	Pan African Medical Journal
China Meta-Analysis 2024	China	5,000	12.42 ± 1.50	Not reported	Asian Journal of Andrology
Iraq Study 2017	Iraq	223	12.6 (stretched)	Not reported	Arab Journal of Urology
Schneider et al. 2001	Germany	143	14.48 / 14.18	Not reported	European Urology
Ponchietti et al. 2001	Italy	3,300	12.5 (stretched)	10.0 (flaccid)	European Urology
Aslan et al. 2011	Turkey	205	13.1 ± 1.7	12.4 ± 1.4	International Journal of Impotence Research
Indian Study 2021	India	230	12.5 ± 1.8	11.2 ± 1.3	Journal of Andrology
Global Average	Worldwide	103,588	13.12 ± 1.66	11.66 ± 1.10	Combined

Study	Sample Size	Key Findings	Source
Yafi et al. (2018)	274	26% growers (≥4cm increase), 74% showers (<4cm increase). Growers had larger erect size (15.5 vs 13.1 cm)	International Journal of Impotence Research
Veale et al. meta-analysis (2015)	692	Mean flaccid: 9.16cm, mean erect: 13.12cm, average increase ~43%	BJU International
Habous et al. (2015)	778	Middle Eastern men: similar growth patterns to Western populations	Arab Journal of Urology
Park et al. (2016)	201	Korean men: Mean growth 7.7cm (flaccid 6.9cm to erect 14.6cm)	International Journal of Urology

Partner Type	Length	Girth	vs Average
One-Night Stand	16.3 cm (6.4")	12.7 cm (5.0")	Slightly larger
Long-Term Partner	16.0 cm (6.3")	12.2 cm (4.8")	Near average
Actual Average	13.12 cm (5.2")	11.66 cm (4.6")	Baseline

Category	Percentile	Range	Frequency
Small (< 2.5th percentile)	< 2.5%	< 10 cm	25 in 1000
Below Average (2.5th - 16th)	2.5% - 16%	10 - 11.5 cm	135 in 1000
Average (16th - 84th)	16% - 84%	11.5 - 14.8 cm	680 in 1000
Above Average (84th - 97.5th)	84% - 97.5%	14.8 - 16.4 cm	135 in 1000
Very Large (97.5th - 99.7th)	97.5% - 99.7%	16.4 - 18.1 cm	22 in 1000
Extremely Rare (> 99.7th)	> 99.7%	> 18.1 cm	3 in 1000

Penis Size Anxiety & Mental Health Education

Calculate Your Size Percentile

Medical Distribution Data

Length Distribution Curve

Circumference Distribution Curve

Normal Size... But Still Worried?

Why Knowing Your Size Doesn't Stop the Worry

Why Size Worry Is So Common

The Big Problem

Why This Happens

What Partners Actually Want

How The Worry Cycle Works

The Truth

How To Stop Worrying (What Actually Works)

The Good News

3 Things That Really Work

1. Fix Your Thinking

2. Stop Checking & Comparing

3. Talk To Your Partner

How Fast You'll Feel Better

Self-Help Actually Works!

What Gets Better

Remember:

Ready for more data?

Comprehensive Medical Studies Database

Belladelli et al. 2023

Mostafaei et al. 2025

Veale et al. 2015

Wessells et al. 1996

Argentina Study 2022

Nigeria Study 2021

China Meta-Analysis 2024

Iraq Study 2017

Schneider et al. 2001

Ponchietti et al. 2001

Aslan et al. 2011

Indian Study 2021

Global Average

Grower vs Shower: The Science of Penile Growth

Medical Definition

Medical Definition

Statistical Distribution

Calculate Your Growth Type

Clinical Studies on Flaccid to Erect Growth

What Determines Growth Type?

Age Factor

Temperature Effects

Cold Response

Recovery

Climate/Ethnicity Myth: Not Supported by Science

What Do Women Actually Prefer?

Study 1: The Perception Gap

Study 2: Physical Preferences (3D Models)

Key Research Findings

The Truth About "Pornstar" Size

Medical Reality Check

IMPORTANT Note

Why Porn Creates Unrealistic Expectations

Health & Relationship Impact

Too Large is Problematic:

Anatomical Limits:

What Women Actually Want:

Anxiety Impact:

Size Categories Based on Statistics

How to Measure Correctly

Understanding Percentiles

Key Facts

Frequently Asked Questions

Medical Questions