Choosing the right menstrual cup size is like finding a shoe that fits perfectly. Before you buy a shoe you will find out your size and which shape fits you comfortably. The same rule applies to menstrual cups, although unfortunately, you can not just go into a store and try them until you find one that works well for you.
As every vagina is anatomically unique there is no such thing as 'one size fits all'. That's why we have a 120 day "no questions asked" money back guarantee. Try a Ruby Cup and if it does not fit, you can change the size or get a full refund.
Luckily, there are many different shapes and sizes of menstrual cups, which makes it possible for you to find the perfect fit.
Your "Goldilocks" cup, we recommend that you know your flow and your anatomy before choosing a menstrual cup.
Here are the two key factors to look out for when choosing the right size:
- Heaviness of your menstrual flow
- Position of your cervix
Once you know these two characteristics you can narrow down your pool of potential menstrual cups. Ruby Cup is a great starter cup and works well for the majority of users. If you're not sure about the height of your cervix, definitely read this guide.
We recommend the Ruby Cup Medium for ultimate comfort.
Heavy flow and low cervix? Both cups work for you:
Ruby Cup Small
For lighter to medium periods
Ruby Cup Medium
For medium to heavy periods
|Cup length||46 mm||51 mm|
|Stem Length||19 mm||17 mm|
|Total Length||65 mm||68 mm|
|Diameter||40 mm||45 mm|
|Capacity to the rim||24 ml||34 ml|
|Capacity to the holes||19 ml||24 ml|
Do age or childbirth influence the menstrual cup size needed?
We do not recommend that you choose your menstrual cup based on whether you have given birth or not or your age. Since each body is anatomically unique, these are not very reliable factors. Ruby Cup Small instead of a Ruby Cup Medium and vice versa.
So keep in mind that giving birth does not mean that you now need a bigger menstrual cup. Your flow and cervix position are better indicators in our experience.