A small cup is the usual starting point for teenagers and first-time users. PeeSafe’s own cup page recommends Small for under 18s.
What menstrual cup size do you actually need?
Choose a menstrual cup size by four things: your age, whether you have given birth vaginally, how heavy your flow is, and how high your cervix sits. In general, a small cup suits teenagers, first-time users, light flow and a low cervix, while medium and large suit heavier flow, a higher cervix, or if you have given birth. PeeSafe’s cup pages recommend Small for first-timers and under 18s, Medium for medium to heavy flow, and Large for heavy flow or after vaginal birth.
Quick facts
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Four factors: age, childbirth history, flow level, cervix height
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PeeSafe guidance: Small for teenagers and first-timers, Medium for medium to heavy flow, Large for heavy flow or after vaginal birth
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Capacity: PeeSafe lists up to 22 ml for its cup, and capacity and firmness vary by brand
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Cervix height matters: a high cervix often suits a longer or larger cup, a low cervix a shorter one
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Wrong size signs: leaks, trouble removing it, or pressure on the bladder
Quick size guide
|
Size |
Typically suits |
|---|---|
|
Small |
Teenagers and under 18s, first-time users, lighter flow, lower cervix, no childbirth |
|
Medium |
Medium to heavy flow, adults, or people who have given birth |
|
Large |
Heavy flow, higher cervix, or after vaginal birth |
Sizes are not standardised across brands. A medium from one brand can differ in length, width and firmness from another’s, so use each brand’s own guide.
How to estimate your cervix height
Cervix height is the distance from the vaginal opening to the cervix, and it can shift a little through your cycle, usually sitting lowest during your period. To get a rough idea, wash your hands, squat or sit, and gently insert a clean finger. If you reach the cervix (it feels like the tip of a nose) at about the first knuckle, it is low. At about the second knuckle it is average, and if you struggle to reach it, it is high. This is a rough guide, not a medical measurement, and a doctor can help if you are unsure.
Measure during your period, when the cervix usually sits lowest, to avoid buying a cup that is too long.
Signs you have the wrong size
|
Sign |
Likely meaning |
|---|---|
|
Leaking even when the cup is not full and has opened |
Cup may be too small, or the wrong shape for you |
|
Cup is hard to remove or you feel the stem a lot |
Cup may be too long, or sitting too low |
|
Pressure on the bladder or frequent urge to pee |
Cup may be too large |
|
Feels uncomfortable the whole time |
Wrong size or too firm. Try another size before giving up |
Most problems are fit problems, not signs that cups do not work for you. How to use a menstrual cup covers insertion tips that often fix early leaks. Once you know your size, browse the menstrual cup collection.
Related reading from the PeeSafe blog
FAQ's
Which menstrual cup size is best for a teenager?
Do I need a bigger cup if I have a heavy flow?
Not always. Capacity matters, but fit matters more. A larger cup can help with heavy flow, especially with a higher cervix, but a cup that is too big may cause pressure or trouble removing it. Emptying more often also helps.
Does my cup size change after having a baby?
It can. After vaginal birth, pelvic floor muscles often change, and many people find a larger cup holds the seal better. Many brands suggest a larger size after childbirth.