How firm is a normal erection?

The Erectile Hardness Scale provides a measure of penis firmness.

Erectile dysfunction isn’t just about getting or maintaining an erection. It’s also about how firm an erection is. Many men lose firmness slowly over the course of erectile dysfunction which leads to increasing dissatisfaction with their sexual experiences.


A firm penis is not only important for penile penetration, but it can also have a serious effect on a man’s self-esteem and sexual confidence. But how firm should an erection be?

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There is something called the Erectile Hardness Scale. This allows men to check if they may be experiencing a loss of penile firmness.

  • 0 – Penis does not enlarge.
  • 1 – Penis is larger, but not hard.
  • 2 – Penis is hard, but not hard enough for penetration.
  • 3 – Penis is hard enough for penetration, but not completely hard.
  • 4 – Penis is completely hard and fully rigid.


Finding out if you could have erectile dysfunction  

The International Index of Erectile Function (IIEF-5) is a survey that helps men determine if they may be suffering from erectile dysfunction. Although this is a good starting point, you should still see a doctor if you expect an erectile disorder.


The IIEF-5 asks the following questions with answers on a 5-item sliding scale:


How do you rate your confidence that you could get and keep an erection? (scale from very low to very high)

When you had erections with sexual stimulation, how often were your erections hard enough for penetration? (almost never to almost always)

During sexual intercourse, how often were you able to maintain your erection after you had penetrated (entered) your partner? (extremely difficult to not difficult)

When you attempted sexual intercourse, how often was it satisfactory for you? (almost never to almost always)


If you score between 22 to 25 points you do not have erectile dysfunction, whereas lower scores may point toward erectile dysfunction from mild to severe.

But only a doctor can accurately assess if you suffer from the condition. An examination by your physician will usually include a check of associated conditions such as high blood pressure or diabetes, and a hormone test to monitor testosterone levels.


Firmness of erection as a health indicator

Strong erections are a good indicator of general health in men. The small blood vessels lining the penis are often the first to become blocked when men suffer arterial diseases such as atherosclerosis. It could even point to more serious issues such as heart disease or diabetes. Hormone imbalances are also common in men with erectile dysfunction.


Erections rarely are ‘too hard’, but you may be experiencing very long erections. If you notice that your erections last longer than two hours, it could be a sign of priapism. Priapism is a medical emergency that requires immediate attention. It can cause serious tissue damage. People with sickle cell disease are more likely to experience priapism.


If you have trouble achieving a firm erection, speak to your doctor. Erectile dysfunction can affect men of all ages, but effective treatments are available.



  1. Dean, J., de Boer, B., Graziottin, A., Hatzichristou, D., Heaton, J., & Tailor, A. (2006). The Role of Erection Hardness in Determining Erectile Dysfunction (ED) Treatment Outcome. European Urology Supplements, 5/13: 767-772.
  2. Erection Hardness Score | (2019). Retrieved September 23, 2019, from <>
  3. Rosen, R., Riley, A., Wagner, G., Osterloh, I., Kirkpatrick, J., & Mishra, A. (1997). The international index of erectile function (IIEF): a multidimensional scale for assessment of erectile dysfunction. Urology, 49/6: 822-830.
  4. International Index of Erectile Function (IIEF-5) | Calculate by QxMD. (2019). Calculate by QxMD. Retrieved September 23, 2019, from <>
  5. Hudnall, M., Reed-Maldonado, A., & Lue, T. (2017). Advances in the understanding of priapism. Translational Andrology and Urology, 6/2: 199-206.

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