How to measure penile curvature

A straight penis is functionally and aesthetically important. Severe penile curvature can interfere with sexual function.

Pediatric Penile Curvature (chordee)

Most cases of pediatric penile curvature are associated with hypospadias. The curvature is typically ventral (towards the bottom side of the penis) and in the midline. Penile curvature tends to form an arc and be distributed along the penile length — arc type of curvature.

Pediatric penile curvature can also be dorsal or lateral.

Adult Penile Curvature

Most cases are associated with Peyronies Disease. Curvature can go in any direction and tends to be concentrated at one point on the penis (as opposed to having the curvature distributed along the length of the penis like in the pediatric population) –or what I call hinge type of curvature

How penile curvature is measured:

There are 3 ways to measure penile curvature:

  1. “Eyeball” method
  2. Goniometer
  3. Digitally using an app or computer program

The eyeball method is the most commonly used. The curvature is inspected and the degree of curvature is guessed.

A goniometer measures the angle in between 2 straight lines. It works better with the adult type of curvature where the angle is concentrated at one point in the penis but poses a challenge for measuring pediatric “arc” like curvature :


Types of penile curvature

Hinge type curvature

When the curvature is concentrated at one point of the penis — a hinge — I call that a hinge type curvature. Those curvatures can be more accurately estimated with a goniometer. Following are some pictures created by dividing a picture of a straight penis in half and then angling the two ends at the hinge with some touch-ups to round up the edges:


Arc type curvature

On the other hand, when the curvature of the penis is not concentrated at one point but at a few points, I call that curvature an arc type. Arc type curvatures are very difficult to measure with a goniometer as explained in this video:

How to measure penile curvature with the Photoblend App

The App can be downloaded here:

Step by step guide

  1. Take the picture of the curvature you want to measure
  2. Take a screenshot of one of the colored penile curvature models above that you think is the closest to the one you are trying to measure. Use either the hinge type or arc-type pictures, whichever looks more similar to the type of curvature you are trying to measure.
  3. Open the Photoblend App and chose the pictures from step 1 and 2
  4. On the App, manipulate each image to make them match as best as possible using the Pan and Zoom function:
  5. Once you matched the two images as best as possible, decide if this would be the best match:
  6. If not the best match, try with a different model until the best match is achieved:




To practice using the App, you can use these models ( or click here for the zip file):

15 thoughts on “How to measure penile curvature”

    • Hi there
      My penis has a curve from the root to left
      So I had to take it in my hand to a bit right
      Then after when I measured it’s about 10 to 20 degree.
      Can I ask please that is it normal for me to have a slight curve from the root means from the start of the penis.

      • About 10% of men have some degree of penile curvature. Men usually seek help for curvatures of more than 20-30 degrees due to pain during intercourse. If the curvature does not bother the patient or his partner, then it probably does not need to be corrected.

    • The curvature is best appreciated on lateral pictures. Up and down pictures would not show the curvature appropiately.

    • The methods described in the article are meant to measure curvature after the base. Bending from the base should be able to be corrected by positioning the penis with the hand. I hope that makes sense.

    • The easiest way to estimate the curvature would be to take a picture and then compare that to the 2nd or 3rd image on the blog post.

  1. Will it be painful or any discomfort for my girl? I have a curved penis (30) degree to the left ( 5 inch penis size), about to have sex for the first time? PLEASE answer (thank you).THERE IS NO PAIN FOR ME IN ERECTION .
    answer soon .

  2. I just checked with the blending app method, and I found that my penis is curves left 20 degree. What is the safe range for penile curvature?

    Do I need a medical attention for 20 degree?

    • Hi Samuel. We don’t provide medical advice on this website. However, how much penile curvature can a person tolerate is a personal matter. Some men seek evaluation for lower degrees of curvature and others for higher degrees of curvature. If a specific degree of curvature does not bother the patient or the partner then I would think it does not need to be treated.


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