4 Steps To Choosing A Menstrual Cup

Step 3: Best Cup Length For Your Cervix

In the previous post I showed you how to use the knuckle rule to find out if you have a low, medium or high cervix. If you haven't completed this step, you may want to go here to do so, because now I'm going to show you a very simple way to find the best cup length for your body.

What You Need:

  • ruler
  • finger used to measure your cervix height

What To Do:

  • Place a ruler next to the finger used to measure your cervix height
  • Measure the length from the tip of your finger to the knuckle that applies to you

What It Means:

  • The length of your finger will tell how many centimeters of available space you have for a cup

Using my finger as an example:

I did the knuckle rule using my index finger. So I'm going to measure the distance between the tip of my finger to the knuckle that applies to me (my second knuckle, i.e I have a medium cervix).
 

The tip of my finger to my second knuckle = 5 cm

This means I have 5 centimeters of available space to fit a cup into

Since menstrual cups are measured in millimeters, lets multiply by 10 to convert cm to mm.

My ‘available cup space’ is 5 cm = 50 mm

Now Let's take a look at the Lena cup:

The base to rim of the cup measures approximately 4.6 cm (stem length isn't included since it can be trimmed)

Available space needed by the cup is 4.6 cm = 46 mm

I have 50 mm of available space and the cup only needs 46mm of space, so the Lena cup fits me jussssst right.

And it's that simple! By using the knuckle rule, you'll be able to look at cup comparison charts with a lot more clarity and know without a doubt which cups have the potential to be your best fitting cup.

Lets take a look at the popular Diva cup as an example:

Both the small and large Diva cups have the same length.They are both 57 mm long. From my measurements, I only have 50 mm of space before reaching my cervix. This means a Diva cup would be way too long for my vaginal canal.This is why it’s important to know your available cup space before purchasing a cup.

After you have your personalized measurement, it's finally time to pick a cup that best compliments your anatomy. If you're ready to put your new-found knowledge to work, check out these cup comparison charts.

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