Menstrual cup size guide

A menstrual cup size is chosen by measurement, flow and comfort. Never by age. If you're just starting out, Size 0 or the 0+1 Kit is the place to begin: a smaller cup is easier to insert and remove the first few times, and the kit gives you the first two sizes to find out in practice.

Take the 3-question quiz to get our suggestion for you.

The measurements of the three sizes

Size	Diameter	Total height	Recommended capacity	Maximum capacity
Size 0	Ø 33 mm	70 mm	10 ml	12 ml
Size 1	Ø 43 mm	80 mm	20 ml	25 ml
Size 2	Ø 47 mm	80 mm	30 ml	35 ml

Total heights measured with the stem. The stem can be trimmed, as explained in the manual that comes with each cup.

The three questions that decide

Have you had a vaginal birth? After a vaginal birth, the anatomy changes and a cup with a larger diameter usually fits better. A caesarean counts as “No”.

Is this your first menstrual cup? If you've used a cup before, you know what to expect. If it's your first, start smaller.

How would you describe your flow? Light: a regular pad or tampon lasts most of the day. Medium: you change 3 to 4 times a day. Heavy: on your heaviest days you change every 2 hours.

Our suggestion for each case

Vaginal birth	First cup	Flow	Suggestion	Alternative
No	Yes	Light	Size 0	Kit 0+1
No	Yes	Medium	Kit 0+1	Size 1
No	Yes	Heavy	Kit 0+1	Size 1
No	No	Light	Size 0	Size 1
No	No	Medium	Size 1	Kit 0+1
No	No	Heavy	Size 1	Kit 1+2
Yes	Yes	Light	Size 1	Kit 1+2
Yes	Yes	Medium	Kit 1+2	Size 1
Yes	Yes	Heavy	Kit 1+2	Size 2
Yes	No	Light	Size 1	Size 2
Yes	No	Medium	Size 1	Kit 1+2
Yes	No	Heavy	Size 2	Kit 1+2

If you're torn between two sizes, the kit settles it in practice: the 0+1 Kit and the 1+2 Kit come with two sizes and a case.

This is a size suggestion, not clinical advice. If you have an IUD, talk to whoever fitted it before trying the cup. If you have any health questions, talk to a professional.