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Léa | ⏳ 3 min read
Menstrual Cup Size: The 2-Minute Guide to Choosing the Right One
Choosing the right menstrual cup size can seem complex at first: small, large, soft, firm... However, a few simple criteria are enough to identify the model that suits you. Age, childbirth, flow, cervix morphology: this decision guide walks you through the process step-by-step to find the menstrual cup size adapted to your body, without having to guess for months.
Table of Contents ❮
What sizes of menstrual cups exist?
Most brands offer two main sizes, often called Size S (or 1) and Size L (or 2). Some also manufacture an intermediate size or a "teen" version for younger users.
Concretely, the size of a menstrual cup affects three elements: the diameter (adaptation to the tonicity of the perineum), the height (adaptation to the position of the cervix), and the capacity (adaptation to the flow). It is therefore not just a question of "small or large vagina," contrary to a persistent misconception.
Please note: Each brand has its own dimensions. A Size S from one brand may correspond to a Size M from another. Always check the exact measurements (diameter in mm and capacity in ml) rather than just the label.
The 4 criteria for choosing your cup size
1. Age
Age provides a first indication because it is correlated with the tonicity of the perineal muscles. Before age 20, a small size (S) is generally recommended. Between 20 and 30 without childbirth, size S often remains the most comfortable. After 30, it depends mainly on the other criteria.
2. Vaginal births
This is the most determining criterion. Vaginal childbirth modifies the elasticity of the perineum. After one or more natural births, Size L generally ensures better sealing. A C-section does not have a direct impact on this choice.
3. Flow intensity
A heavy flow requires a larger capacity to space out emptying. If you usually change your protection every 2 hours on heavy days, look for a capacity of at least 30 ml. For a light to medium flow, a capacity of 15 to 25 ml is sufficient.
4. Cervix height
A high cervix allows for a longer cup. A low cervix requires a short cup, otherwise it will protrude or cause discomfort. We will look at how to easily measure this height next.
Summary table: find your size at a glance
Here is a summary table to help you quickly identify the size best suited to your profile.
| Profile | Recommended size | Indicative capacity |
|---|---|---|
| Under 20 years old, no childbirth | Size S / Teen | 15 to 20 ml |
| 20-30 years old, no childbirth, light to medium flow | Size S | 20 to 25 ml |
| 20-30 years old, no childbirth, heavy flow | Size S or L | 25 to 30 ml |
| Over 30 years old, no vaginal birth | Size S | 20 to 25 ml |
| After vaginal birth | Size L | 30 to 40 ml |
| Low cervix, regardless of the situation | Short cup | Depends on flow |
And additionally, if you are hesitating between two sizes, always start with the smaller one. A cup that is too large often creates more discomfort than one that is slightly undersized, which will simply need to be emptied a little more often.
How to measure your cervix height
This is the step that most tutorials forget, yet it changes everything. Here is the method, to be done during your period (the cervix changes position during the cycle):
- Wash your hands thoroughly.
- Gently insert a finger into the vagina, while squatting or standing with one foot elevated.
- The cervix can be identified by its slightly firmer texture, a bit like the tip of your nose.
- Count how many knuckles it takes to reach it.
Interpretation:
- Low cervix: reached with a single knuckle → prefer a short cup.
- Medium cervix: reached with two knuckles → most standard cups are suitable.
- High cervix: difficult to reach → you can opt for a longer cup with a stem.
Caution: The menstrual cup is not trivial. As recalled by the ANSM, respect the indicated maximum wear time, empty and rinse the cup regularly, and sterilize it between each cycle. For a cup, this is up to 12 hours according to the manufacturer's instructions. In case of fever, nausea, or skin rash while wearing it, remove the cup immediately and consult a healthcare professional.
Frequent mistakes when choosing a size
Some classic traps to avoid to ensure you choose the right menstrual cup size:
- Choosing a Size L "just in case" for a heavy flow without having given birth: the cup might not unfold properly or cause unnecessary pressure.
- Ignoring cervix height: this is the leading cause of discomfort and leaks, even with the "correct" theoretical size.
- Neglecting firmness: beyond size, a soft cup is better suited to sensitive perineums, while a firm cup opens more easily but can create pressure.
- Relying only on online reviews: every anatomy is unique. What suits a friend will not necessarily suit you.
Once you have identified your size, the next step is to learn the right techniques. Our guide on how to insert a menstrual cup details the different folding and positioning techniques.
Frequently asked questions about menstrual cup sizes
Can you use a cup if you are a virgin?
Yes, but it is generally advised to choose a Size S or Teen, which is thinner and shorter, for optimal comfort. The cup does not visibly replace the hymen, but inserting it may require an adjustment period.
Do I need to change sizes after childbirth?
In most cases, yes, after a vaginal birth. However, wait until the end of the postpartum period and the return of your period before resuming the use of a cup, and seek the advice of your midwife or gynecologist.
What to do if my cup leaks despite having the right size?
Leaks rarely come from the size itself, but more often from improper deployment (the cup does not open completely) or a cervix that dips into the cup. Verify that the cup is fully open by rotating it gently after insertion.
How long can I keep the same size?
A well-maintained medical-grade silicone cup lasts for several years. You only need to change sizes in the event of significant bodily changes: childbirth, menopause, or a significant loss of muscle tone.
What if painful periods persist despite using a cup?
The cup does not reduce menstrual cramps per se. If your pain remains severe, several gentle solutions exist, such as heat, stretching, or TENS electrostimulation. You can explore our article on how to quickly relieve menstrual cramps.
Ready to find your menstrual cup?
The Madame Patch menstrual cup, made of soft medical-grade silicone, keeps you comfortable throughout your period. Customer service in France, delivery in 5 to 7 days.
Discover the product →Key Takeaways
Choosing your menstrual cup size in 2 minutes is possible by cross-referencing four simple criteria:
- The 4 key criteria are: age, vaginal births, flow intensity, and cervix height.
- Size S is suitable for the majority of users who have not given birth vaginally.
- Size L is generally recommended after a vaginal birth or for a very heavy flow.
- Measuring your cervix height during your period is the most useful step to avoid discomfort and leaks.
- If in doubt between two sizes, always start with the smaller one.
- Respect the maximum wear time, hygiene, and sterilization between cycles for optimal use.
Léa | Editorial Manager for Menstrual Health, Madame Patch
Since 2022, I have been writing content to educate you on all topics related to painful periods (PMS, endometriosis, adenomyosis, PCOS, simulator, etc.).
