Menstrual Cup Sizing: Let’s Clear This Up First

If you’ve ever Googled “what size menstrual cup should I use?”, you’ve probably seen advice based on age, whether you’ve had kids, or even assumptions about vaginal “looseness”.

Let’s set the record straight:

Menstrual cup size is determined primarily by your cervical height, not the width of your vagina.

Your vagina is elastic and designed to stretch and return to shape. What matters most is where your cervix sits during your period, because that determines how a cup fits and functions inside your body.

Why Cervical Height Matters More Than Anything

Your cervix is the “target” for your menstrual cup. If the cup doesn’t sit correctly in relation to your cervix, it can leak, feel uncomfortable, be hard to remove, or "disappear".

How to Check Your Cervical Height

During your period, insert a clean finger and feel for your cervix (it feels like the tip of your nose).

Low cervix: You can feel it near your first knuckle

Medium cervix: Around your middle knuckle

High cervix: You have to reach deep or can’t easily feel it

What That Means for Cup Sizing

Low cervix → Smaller/shorter cup

Medium cervix → Most standard sizes work

High cervix → Longer cup or easier-to-reach base/stem

What About Vaginal “Tightness”?

This is one of the biggest myths.

Your vaginal canal:

• Expands and contract naturally
• Adjusts to fit a tampon, cup, or baby
• Is influenced more by pelvic floor muscles than size

So no, you don’t need a “bigger cup” because you’ve had kids, and you don’t need a “smaller cup” just because you haven’t.

Other Factors That Affect Cup Fit

While cervical height is the #1 factor, a few other things matter:

1. Flow Level

Heavier flow → you may prefer a higher-capacity cup

Lighter flow → smaller capacity may feel more comfortable

2. Pelvic Floor Strength

Strong pelvic floor (runners, lifters, athletes) → may prefer a firmer cup that opens easily

Weaker or more sensitive pelvic floor → may prefer a softer feel

3. Sensitivity & Cramping

Some people feel pressure from very firm cups, while others struggle with soft cups that won’t fully open.

Why Cup Firmness Matters (and Where Poppins Cups Shine)

One of the most common reasons cups leak isn’t size, it’s that the cup isn’t fully opening.

Poppins Period cups are designed to be:

-Firm enough to open easily once inserted

-Flexible enough to stay comfortable throughout the day

That balance helps reduce leak, improve seal consistency, ake insertion easier, especially for beginners

Poppins Cup Sizes: Simple, Functional Options

We offer three thoughtfully designed sizes to match different bodies and needs:

Teen: Best for lower cervix heights or those wanting a more compact fit

Small: Great for average cervix height and everyday use

Large: Ideal for higher cervix or those wanting more capacity

And remember: it’s about fit and placement, not body size.

Signs You Might Have the Wrong Size

You might need a different size or style if:

• Your cup leaks even when inserted correctly
• It feels like it’s sitting too low or falling out
• You can’t reach it easily for removal
• It feels uncomfortable or creates pressure

The Bottom Line

Choosing the right menstrual cup isn’t about guessing your size, it’s about understanding your anatomy. Start with your cervix, not assumptions about your body.

When you match your cup to your body- especially your cervical height- everything gets easier: insertion, comfort, and leak protection.

Still unsure of what size would work best? Try one of our 2-packs that includes 2 different sizes. Remember, our Poppins Promise: If you don’t love it, send it back for a refund.

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