Are my testicles too small?


If your testicles are significantly smaller than average, consider the following possible causes:

  • An undescended testicle. Your testicle may not have developed fully because it didn’t descend correctly in childhood.
  • Hormone imbalances (possibly as a result of hypogonadism). If your body does not produce enough of certain hormones, your testes will not ramp up testosterone production.
  • High exposure to female sex hormones. You may have been exposed to significant amounts of estrogen.
  • Klinefelter Syndrome. An extra copy of the X chromosome will result in smaller testicles (usually up to 6 ml). If only a part of your cells have an extra X chromosome, you may suffer from mosaic Klinefelter Syndrome. Your testicles may be 6-15 ml in size. Use the orchidometer app to find out if it could be Klinefelter Syndrome.
  • Testicular atrophy. A testicle that is smaller than 12 ml can be considered to be atrophied.

Bigger testicles

There isn’t a one-fits-all solution for small testicles. Taking fish oil supplements may result in a small increase in testicle size. Getting enough exercise and eating a healthy diet will maximise your testicular volume.

If you are noticing a sginificant change in testicle size, contact your doctor for a medical exam. A doctor may prescribe medications such as HCG or Clomid to stimulate your testicles to produce more testosterone.

Are you still unhappy with your testicle size? Some plastic surgeons offer surgery with implants to increase the size of your testicles.

You can also get a Scrotox procedure, where botox is injected into the scrotum. This will not enlarge the testicles, but it will make them look larger.

The silver lining

There are some upsides to having smaller testicles. It does not necessarily impact fertility or testosterone levels. In fact, having ‘small balls’ may even have some benefits.

One study showed that having small testicles is associated with being a better father. Small testicles can also visually enhance the size of your ‘package’. Only when your testicles are smaller than 15 ml (around 1.4 inches or 3.5 cm in width), testosterone production could be affected.

To find out if your testicles are smaller than 15 ml, use the orchidometer app for iPhone.

The Orchidometer app
Find out if you suffer from testicular atrophy or Klinefelter Syndrome with the Orchidometer app (available on the App Store)


  • John January 10, 2022

    Hi my testicles are right side 4.41 x 2.35 x 2.42 = 13.2ml
    Left 4.68 x 2.19 x 2.89 = 15.52ml
    Could I have mosaic Klinefelters?
    I am 26.

    • orchidometer January 11, 2022

      Hi John,

      In the Orchidometer app, your right testicle corresponds to around 14-16 ml and your left testicle to around 20 ml in volume. To estimate testicular volume, Lambert’s formula is more accurate than the ellipsoid formula (that I assume you’ve used). If you have Klinefelter Syndrome, your testicles would likely be smaller than 6 ml in volume. If you have mosaic Klinefelter Syndrome, a volume of less than 15 ml is likely, although there are exceptions. Do you have any other symptoms, such as weak muscles, delayed puberty, being taller than average and having gynecomastia? Here’s what the Orchidometer app would show you with the volumes you provided. Please note that you should always contact a doctor if you want to get an accurate diagnosis. The only way to know with certainty if you have Klinefelter Syndrome, is to get a karyogram.

      • John January 11, 2022


        I am 6ft4
        Those measurements were given by a doctor after having an assessment (where they put the gel on your testes to gain measurement). I am “skinny fat”.
        I have normal beard growth etc which is why I’m scared I have mosaic Klinefelters

        • orchidometer January 11, 2022

          You could request a fertility test if a karyotype is not an option. If you have Klinefelter Syndrome, you are most likely sterile. If you have mosaic Klinefelter Syndrome, you would likely be infertile or have reduced fertility. You can also use the Orchidometer app to compare your testicle size to the ellipse shown in the app. Don’t forget to turn on the option in Settings -> Genetic disorders -> Klinefelter Syndrome -> Show indicator.

        • John January 11, 2022

          I was also born with an undescended testicle (my right one)

  • Demari January 9, 2022

    Does my parents dna determine my testicle size?

    • orchidometer January 10, 2022

      Hi Demari,

      Yes, your testicle size is mostly determined by your DNA. In mice, a study showed that testis size is controller by around 40 genes. Two of these genes control testis size by regulating the number of Sertoli cells. But your testicle size can also be affected by other factors such as the environment, age and disease. If you are younger than 18, your testicles will likely still grow. If you’re already an adult, your testicle size could be smaller if you have Klinefelter Syndrome or suffer from testicular atrophy. If you want to know how your testicle size compares to the average male, use the ‘Normal distribution’ option in our Orchidometer app. With this option, you can check what percentage of the population has larger and smaller testicles. You can also check whether you might have Klinefelter Syndrome or testicular atrophy. This is not a diagnosis, however, and you should always consult with a doctor if you have questions about your testes.

  • Jacob P. January 6, 2022

    My testicles measure in at about 4cm at length and 3cm in width. Would I be at risk for Klinefelter syndrome?

    • orchidometer January 6, 2022

      Hi Jacob! A testicle of 4 cm in length and 3 cm in width would mean a volume of around 25 ml. That is much larger than a testicular volume associated with Klinefelter Syndrome and looks more like the average adult size. People with Klinefelter Syndrome often have a testicular volume less than 2.5 cm x 2 cm x 2 cm. (or a volume of less than 6 ml). People with mosaic Klinefelter Syndrome can have larger testicles, but usually below 15 ml. If you want to accurately measure your testicle size and see if you might have have this syndrome, please use our Orchidometer app and enable the option in Settings -> Genetic disorders -> Klinefelter syndrome > Show indicator. If you save a measurement by tapping on the orchidometer, you can view if you are at risk by opening the measurements screen and tapping on ‘Klinefelter syndrome’. This will add a filter to the chart with measurements.

      Please note that this is not medical advice and only a doctor can tell you if you have Klinefelter Syndrome. You can request a Karyotype to get a definitive answer to your question.

  • Shaun H. December 17, 2021

    Do I have small testicles? The right testicle is 1.3 inch and the left is slightly smaller at 1.2 inch?

    • orchidometer December 17, 2021

      Hi Shaun! It very much depends on your age. A size of 1.3 inch would mean a testicular volume of around 12-14 ml. But it could be a little bit more or less (to get an accurate measurement, please use our Orchidometer app).
      A volume of 14 ml means you are in Tanner stage 4, which is almost an adult size (Tanner stage 5). Your testicular volume could also vary during the day or week, so it could be useful to take several measurements. Testicular atrophy means you have a testicular volume of less than 12 ml in volume, which appears not to be the case for you. In Klinefelter Syndrome, we often see a testicular volume of less than 10 ml, which would mean a testicle width of less than or around 1 inch. If you’d like to see how you compare to the population in size, check out the ‘normal distribution’ option in our app. Select your age and see what percentage of the population has smaller and bigger testicles than you.


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