Size Guide

Zero menstrual cups are available in two sizes: Small and Large. 

Zero cup dimensions are as follows (in mm):

S model (20ml capacity) 42.5 width (diameter), 48.2 length, and 70.3 including the stem.

L model (25ml capacity) 45.5 width (diameter), 52.1 length, and 76.3 including the stem.

Zero menstrual cup diagram

Which Size Is Right For Me?

Generally speaking, the small Zero (S model) is recommended for users under 30 and who have never given birth, and the large Zero (L model) is recommended for users over 30 or who have given birth vaginally at any age.

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However, there are some other important things to consider before deciding which size to go for:


If it’s your first time using a menstrual cup or you’re a teenager, you may find S model easier to insert and remove at first. If you’re over 35 – L model will be best suited for you.

Bladder Sensitivity

Some firmer cups can be uncomfortable if you’ve got a sensitive bladder – use S model as it is made of a softer silicone than our L model, so it will contour to your vaginal walls easier without putting pressure on your bladder.


Congratulations on the miracle of birth! L model will be perfect for your vagina: it’s made of silky yet firm silicone, has a higher capacity, and is larger in size – great!

Pelvic Floor Tone

If you lead a very active & healthy lifestyle and have a toned pelvic floor, then S model will be best for you. If you have weaker pelvic floor muscles, then consider L model as the firmer silicone and larger size will prevent any leakage.

Cervix Height

Take the time to work out the height & positioning of your cervix – if you’ve got a low sitting cervix, S model could be more comfortable for you as the length of the cup is shorter.

Your Menstrual Flow

Did you know the average amount of menstrual fluid expelled each period is between 20 and 50ml? If you have got a heavy flow, then model L may be more practical for you as it boasts an extra 5ml holding capacity than the smaller cup.

Should I Trim the Stem of my Zero Cup?

It is only necessary to trim the stem of your cup if it is protruding from the vagina once correctly inserted.

Zero Cup is designed with a stretchy, ridged stem to assist with grip and to help you reach the base of your cup for secure removal.

While the stem is longer than some other brands (2.21cm for S model or 2.41cm for L model), it can be trimmed down to a length of your preference.
Some users trim the stem, others cut it off completely, and others leave the stem at full length. It is a personal choice, so you will need to see what works best for you.
If you have a high sitting cervix, the long stem is ideal to help you reach your Zero Cup. If your cervix is low-sitting, you may find trimming the stem or removing it completely ensures for a more comfortable fit.
Before you trim the stem, make sure you are confident removing your menstrual cup without using the stem. Also, if you cut the stem in increments, you may find you don't need to cut it off completely.


If you have any trouble deciding which size is best for you, feel free to contact Zero for further assistance.

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