Menstrual cups come in a surprising range of shapes. Some are tall and tapered, some are wider and rounder and others have an angled or asymmetrical design.
The important part is that shape is only one factor in menstrual cup fit. Your cervix height, cup length, diameter, firmness, capacity and stem or removal design can all affect how a cup feels and performs. There is also no universal industry standard for menstrual cup shapes or sizing, so comparing the actual dimensions and design of a cup is more useful than choosing by shape name alone.
What does menstrual cup shape actually mean?
When we talk about menstrual cup shape, we're describing the overall profile of the cup body when it's open. Shape can affect how the cup takes up space in the vaginal canal, how it sits around the cervix and how the cup feels when worn.
Shape isn't the same as size. Two cups can have a similar shape but different lengths, diameters, capacities or firmness levels.
There also isn't one universal system for naming cup shapes. Different brands may use different terms for similar designs, so it's useful to look at the cup's actual measurements and construction rather than relying on the shape label alone.
The main menstrual cup shapes
Period Shop groups menstrual cups into several broad shape categories. These categories are useful for comparison, but they shouldn't be treated as strict clinical or industry-standard classifications.
V-shaped menstrual cups
V-shaped cups taper towards the base, creating a profile that is narrower at one end and wider towards the rim.
This shape is common across menstrual cup ranges and can vary considerably in length, width and firmness. A V-shaped cup isn't automatically better for a particular cervix height or flow level because those factors depend on the cup's full design.
See the V-shaped menstrual cups collection to compare examples.
Bell-shaped menstrual cups
Bell-shaped cups are generally wider through the lower body with a rounded or flared profile that resembles a bell.
The exact shape can differ between brands, so check the dimensions, rim width and body length when comparing cups.
See the bell-shaped menstrual cups collection for examples.
Round or bulb-shaped menstrual cups
Round or bulb-shaped cups have a fuller, more rounded body rather than a strongly tapered profile.
This can change how the cup occupies space and how its body feels compared with a more tapered design. Shape alone doesn't tell you whether a cup will feel comfortable or provide a good seal.
See the round or bulb-shaped menstrual cups collection to compare designs.
U-shaped menstrual cups
U-shaped cups have a more curved profile with a rounded base and sides rather than a pronounced V taper.
As with other shape categories, the actual dimensions and firmness of the cup can vary considerably between products.
See the U-shaped menstrual cups collection for examples.
Asymmetrical or angled menstrual cups
Asymmetrical or angled cups have a body or rim that isn't evenly shaped from one side to the other.
These designs may be worth comparing when you're looking for a cup with a different overall profile or a particular removal or positioning design. An angled shape doesn't guarantee a better fit for a particular anatomy.
See the asymmetrical or angled menstrual cups collection to compare options.
What about narrow-shaped and collapsible cups?
Narrow-shaped is a useful practical category for comparing cups with a slimmer overall profile. This can be relevant when diameter is an important fit consideration.
See the narrow-shaped menstrual cups collection for examples.
Collapsible describes a storage or folding feature rather than the open-body shape of the cup. A collapsible cup may have a different shape once opened, so it's better to consider its actual dimensions and design separately.
See the collapsible menstrual cups collection for examples.
Does menstrual cup shape affect fit?
Yes, shape can affect how a menstrual cup feels and where it sits, but it isn't enough to predict fit on its own.
A laboratory study published in 2021 examined 14 menstrual cups and grouped them into V, bell, round and asymmetrical categories. The researchers did not find a statistically significant relationship between cup shape and either volume or firmness. This is one reason it's better to consider several cup characteristics together rather than assuming one shape has a particular capacity or firmness.
In practice, fit is influenced by a combination of factors including your anatomy, cervix height, the cup's length and diameter, firmness, capacity and stem or removal design.
Shape vs length, diameter and firmness
Length
Cup length can affect where the cup sits and how easy it is to reach for removal. Your cervix height can be a useful starting point when comparing cup lengths, but it isn't a complete fit assessment.
Diameter
Diameter affects how wide the cup is once open. A cup that feels too wide may create pressure or awareness for some people, while a narrower cup may feel easier to accommodate. These are individual experiences rather than guarantees based on diameter alone.
Firmness
Firmness describes how much resistance the cup has when you squeeze the body or rim. It can influence how the cup opens, how strongly you feel it and how it responds to movement.
Read more about choosing a soft or firm menstrual cup.
Capacity
Capacity is the amount of menstrual fluid the cup is designed to hold. Two cups with similar shapes can have different capacities, so shape shouldn't be used as a shortcut for choosing based on flow.
Stem and removal design
The stem or other removal feature can also affect comfort and ease of use. A cup can have a shape that looks suitable on paper but still feel uncomfortable because another part of the design doesn't suit you.
How to choose a menstrual cup shape
Instead of choosing a shape on its own, use shape as one part of a broader fit comparison.
- Consider your cervix height. This can help you compare cup lengths and decide whether a particular design is likely to be practical for reach and removal.
- Compare diameter. Think about how wide the cup is and how that may feel for your anatomy and comfort preferences.
- Look at firmness. Consider whether you prefer a softer or firmer cup and how that may affect opening, pressure and awareness.
- Check capacity. Compare the stated capacity with your usual menstrual flow rather than assuming a particular shape holds more.
- Consider removal. Look at the stem, base or other removal design and whether it seems practical for you.
- Think about your priorities. Swimming, exercise, overnight wear, sensitivity to pressure and previous cup experience can all be relevant when comparing options.
You can compare the current range in the Period Shop menstrual cup collection or use the Period Shop quiz to narrow down options based on several fit factors.
What if your cup doesn't feel right?
If a menstrual cup feels uncomfortable, leaks or is difficult to insert or remove, the problem isn't necessarily the shape. Position, seal, length, diameter, firmness, cervix height and insertion technique can all play a role.
Start by checking that the cup has opened fully and is positioned comfortably. You may also find it useful to compare another fold, adjust the cup's position or try a different size or design.
For troubleshooting, see our guide to getting a menstrual cup to open and our guide to menstrual cup leaking.
If you're experiencing ongoing pain, significant bleeding, repeated difficulty using internal menstrual products or another concerning symptom, consider speaking with a qualified healthcare professional.