Size Guide

Getting the perfect fit

Find the perfect fit for your new reusable menstrual care journey!


With just a few considerations in mind, you will have the perfect fit in no time!

We also offer dedicated product support, so if you have any questions at all please call us on 0800 692 876 anytime between 9am - 2.30pm Monday to Friday - we can help!

Menstrual Cup Size Guide

  • Before your period, your uterus relaxes and drops your cervix down lower into your vagina, the entrance to the cervix opens and the blood flows into the vagina - this may also vary from person to person.

    Because of this you may find that your cervix is lower on days 1 - 3 of your period, requiring a smaller cup. Then on days 3+ you may need a larger cup as your uterus tightens again, lifting your cervix up and slowly back into its normal position - You may need two sizes of menstrual cups to work with your active cervix!

    The most important factor in choosing the right cup is knowing your cervix height. 

    HERE is a detailed page on cervix height.

    If you want to be absolutely sure about your cup size you need to check the height of your cervix every morning during your entire period. Then you can work out which cup would be best in terms of height. But you still need to be sure about the cup width.

  • MyCup™ Teen Menstrual Cup Size 0

    MyCup™ Menstrual Cup Size 0

    Best for teens ages 12 -18 or anyone who feels like they may need a smaller cup.

    The dimensions of the MyCup™ Teen Menstrual Cup Size 0 are as follows:

    • Capacity to breathing holes: 16.5 ml

    • Capacity to rim: 22 ml

    • Length including stem: 62 mm

    • Length of the cup only: 44.5 mm

    • Length of stem only: 17.5 mm

    • Width of diameter: 38 mm

    Cup width considerations: Tampon size

    Petite tampons only → MyCup Size 0

    Petite and Small tampons only → MyCup Size 0

    Small and Regular Tampons → MyCup Size 0 and/or MyCup Size 1

    Shop MyCup™ Size 0 
  • MyCup™ Size 1

    MyCup™ Size 1

    For people who use regular tampons most of the time and people who are first-time cup users (apart from teens).


    • Capacity to breathing holes: 23 ml

    • Capacity to rim: 29 ml

    • Length including stem: 72 mm

    • Length of the cup only: 44.5 mm

    • Length of stem only: 27.5 mm

    • Width of diameter: 42mm

    Cup width considerations: Tampon size

    Small and Regular Tampons → MyCup Size 1

    Regular Tampons only → MyCup Size 1

    Regular and Super Tampons → MyCup Size 1 and/or MyCup Size 2



    Shop MyCup™ Size 1 
  • MyCup™ Size 2

    MyCup™ Size 2

    For people who use super tampons all of the time, including people who already use a large cup & may want to change brands, or people who often find tampons fall out.

    • Capacity to breathing holes: 32 ml

    • Capacity to rim: 40 ml

    • Length including stem: 67 mm

    • Length of cup only: 51 mm

    • Length of stem only: 16 mm

    • Width of diameter: 46 mm

    Cup width considerations: Tampon size

    Regular and Super Tampons → MyCup Size 1 and/or MyCup Size 2

    Super Tampons only → My Cup Size 2


    Shop MyCup™ Size 2 
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  • Please take into consideration the following aspects as well; you may need to call us on our free helpline to ensure you are getting the right size cup to cater for any of the following conditions:

    • Prolapse (firmer cup)

    • Very Low Cervix (can feel it just inside the entrance to the vagina)

    • Very High Cervix (cannot find it)

    • Sensitivity (softer cup)

    • Endometriosis (heavy periods and a softer cup)

    • PCOS (heavy periods/irregular periods)

My Cup Size Guide

Applies to: My Cup Menstrual Cups. The most important factor in choosing the right cup is knowing your cervix height. You need to check this every day during your period as your cervix can move.

Once you know your cervix height you can have a good idea of what menstrual cup "height" you will need.

Shop MyCup Menstrual Cups

Merula Cup Size Guide

Applies to: Merula Standard and Merula XL Menstrual Cups

Shop Merula Menstrual Cups

Me Luna Cup Size Guide

Applies to: All Me Luna Menstrual Cups

Shop Me Luna Menstrual Cups

Period Underwear Size Guide

Period underwear is designed to look and feel like normal underwear - except it has a superhero-like quality. They can capture your menstrual flow for the ultimate security and peace of mind!

Period underwear has come a long way. No more cumbersome granny undies. They quite simply look and perform amazingly you will be wondering why you didn't make the switch earlier!

Period underwear can function in addition or in place of other menstrual care products - including menstrual cups for a perfect combination.

It is advisable to buy more than one pair while you are first getting used to it. It is also important to have a good understanding of your flow.

Love Luna Size Guide

Applies to: Bikini Brief, Full Brief, Midi Brief, Luxe Period Full Brief, Luxe Period Midi Brief, Period Swim wear, Heavy Brief (40mls)

Shop Love Luna Period Underwear

Love Luna Teen Size Guide

Applies to: Love Luna Period Underwear Teen Range

Shop Love Luna Teen Period Underwear

Modi Bodi Size Guide

Applies to: Full Modi Bodi Period Underwear Range

Shop Modibodi Period Underwear

Bamboo Basics Bra Size Guide

Applies to: Bamboo Basics Body Bra Sizes

Shop Bamboo Basics Bras
  • Cleaning Products

    Practical cleaning tips and products to help you keep your menstrual care products clean!

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