Penis Size Calculator
Enter a professionally comparable length or circumference measurement to estimate its percentile against published adult reference data. Results are private and calculated only in your browser.
Calculate your percentile
Choose the measurement you actually took. Do not compare an erect measurement with a flaccid reference group.
For length, measure along the top from the pubic bone to the tip of the glans. For girth, wrap a flexible tape around the mid-shaft without compressing the skin.
Your result will appear here
You will see an estimated percentile, comparison with the study mean and the limits of the calculation.
See your result in the population
Use three complementary views to understand statistical position. These charts use the same pooled means and standard deviations as the calculator and update when you calculate.
Erect length distribution
Enter a value
Where the measurement sits
The centre band contains the middle 50% of the modeled reference distribution. Extreme bands contain fewer observations; they are not medical diagnoses.
Published mean length
Bars show pooled arithmetic means, scaled to 14 cm. They do not show individual change between states.
Published mean girth
Bars show pooled arithmetic means, scaled to 12 cm. Length and circumference are separate measurements.
How to measure correctly
Measurement technique can change the result. Use the same method as the clinical reference data before interpreting a percentile.
Use a rigid ruler for length and a flexible, non-stretch tape for circumference.
Place the ruler on the upper side and gently press through the fat pad to the pubic bone.
Measure to the tip of the glans, excluding foreskin. Repeat under similar conditions if needed.
See the complete penis measurement guide before using the calculator.
Reference values used by this calculator
The calculation uses pooled means and standard deviations reported by Veale and colleagues. The review included measurements taken by health professionals rather than unverified self-reports.
| Measurement | Participants | Mean | Standard deviation |
|---|---|---|---|
| Flaccid length | 10,704 | 9.16 cm | 1.57 cm |
| Stretched flaccid length | 14,160 | 13.24 cm | 1.89 cm |
| Erect length | 692 | 13.12 cm | 1.66 cm |
| Flaccid circumference | 9,407 | 9.31 cm | 0.90 cm |
| Erect circumference | 381 | 11.66 cm | 1.10 cm |
Primary source: Veale D, Miles S, Bramley S, Muir G, Hodsoll J. Am I normal? A systematic review and construction of nomograms for flaccid and erect penis length and circumference in up to 15,521 men. BJU International. 2015;115(6):978–986. DOI: 10.1111/bju.13010.
What your percentile means
A percentile is a statistical position, not a quality score. The 60th percentile means the measurement is larger than an estimated 60% of measurements in the reference distribution and smaller than about 40%. It does not measure sexual function, fertility, masculinity, partner satisfaction or health.
Understand the result in context
Frequently asked questions
What is the average erect penis size?
The pooled review used here reported a mean erect length of 13.12 cm (5.17 inches) and mean erect circumference of 11.66 cm (4.59 inches). These are study averages, not targets.
Is this calculator medically diagnostic?
No. It is an educational statistical comparison. A clinician considers measurement technique, development, anatomy, symptoms and distress before making any diagnosis.
Why can my measurement change?
Temperature, arousal quality, anxiety, time and technique can affect a measurement—especially in the flaccid state. Use a consistent method and avoid repeatedly checking for tiny differences.
Does a higher percentile mean better sexual function?
No. Percentile does not measure erectile function, sensation, fertility, compatibility or satisfaction.
When should I speak with a healthcare professional?
Seek professional advice for pain, new curvature, injury, erectile difficulty, developmental concerns or persistent distress about body image. Do not use this result to justify unregulated enlargement products or procedures.