Which menstrual cup size is right for me?

Ruby Cup is available in two sizes, small and medium. We recommend Ruby Cup Small for girls and women with a light to medium flow and Ruby Cup Medium for women with a medium to heavy flow. These are the Ruby Cup measurements.

Ruby Cup Small

For light to medium flow

Cup Length Stem Length Total Length Diameter Capacity to the Rim Capacity to the holes
46 mm 19 mm 65 mm 40 mm 24 ml 19 ml

Ruby Cup Medium

For medium to heavy flow

Cup Length Stem Length Total Length Diameter Capacity to the Rim Capacity to the holes
51 mm 17 mm 68 mm 45 mm 34 ml 24 ml

If you are in doubt, remember that both cups can work for you. If you have a heavy flow and use a Ruby Cup Small, you would only need to empty it more frequently than Ruby Cup Medium. And if you have a light flow, it is ok to use the medium cup, it will only hold more than the Ruby Cup Small and not be full when emptied.

Also interesting: Some women with a low cervix prefer Ruby Cup Small or cut the stem of the Ruby Cup Medium. 

Still in doubt? Our Recommendation

Ruby Cup Sisterpack

From our experience, a combination of Ruby Cup Medium and Ruby Cup Small is optimal. For your lighter days, you can use Ruby Cup Small and during your heavy days, you use Ruby Cup Medium. You can order a small and medium with a discount by choosing Ruby Cup Sisterpack.

Getting started

For first time users, Ruby Cup Small might help you get started. After a few insertions and removals, it is easy to switch to Ruby Cup Medium.  Still in doubt? See some of user recommendations here.