How to Measure Your Penis Size

When choosing a condom, it's good to know the number

How to Measure Penis Size
How to Measure Penis Size. Photo © Dawn Stacey

When it comes to choosing the perfect condom, size can make all the difference. So many men complain about condoms fitting too tightly, but often it's a matter of not wearing the proper size. One way to be sure you're getting the best fit is to measure your penis.

In order to accurately measure your penis size, you must have an erect penis. A limp penis will not give you the full penis size. How you choose to accomplish this task is up to you.

But you can't move any further in measuring your penis size until your penis has assumed the proper position.

Measure Penis Length

Start off by measuring the length of your penis:

  • Use a ruler or measuring tape
  • Position it at the base of your erect penis, where it attaches to your body
  • Make sure to press into the pubic bone as far as you can because fat can actually hide the length of your penis
  • Measure your penis length by marking how long it is from the base, all the way to the end of the tip. 

Next, you'll measure the girth of your penis (that is, the circumference or thickness):  

  • For this step, use a piece of string (or something similar) or a soft measuring tape
  • Gently wrap the string one time around the thickest part of the shaft/body of your erect penis
  • Mark where the string meets
  • Then measure the distance of the string distance with a ruler. You could also do the same thing with the soft measuring tape, and just mark the measurement once you reach around the penis

    You may also want to know the width or diameter of your penis—since some condoms provide this measurement:

    • You can determine your penis width or diameter by taking the girth measurement you got and dividing it by 3.14
    • The number you get after doing this is the width of your penis

    So I Measured My PenisWhat's the Average Penis Size?

    Now that you have a good idea of your penis size, you can compare it with the average penis size.

    Typically, the average erection has a penis length of approximately 5.5 to 6.3 inches (139.7 to 160.02 mm). The average penis girth ranges between 4.5 to 5.1 inches (114.3 to 129.54 mm), and the average width is about 1.4 to 1.6 inches (35.56 to 40.64 mm).

    If your penis size is close to these averages, then a standard size condom should provide you with the most accurate fit. 

    Double Check Your Penis Size

    You want to get the most accurate measurement of your penis size. To do this, you should repeat the above steps at different times throughout the day, over several days. Penis size can vary due to stress, fatigue, frequency of sexual activity, and arousal levels.

    Using Your Penis Size to Choose a Condom

    Now, you've figured out how to measure your penis size. Once you are confident that you have figured out your penis size, you should be able to determine what size condom you need. So, it's now time to find you the perfect condom! Use this condom size chart to compare the sizes of the most popular condom types and find the one that will be a good fit for you. Good luck!


    Herbenick D, Reece M, Schick V, Sanders SA. "Erect penile length and circumference dimensions of 1, 661 sexually active men in the United States." The Journal of Sexual Medicine. 2014;11(1):93–101.

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