The Diva Cup comes in three sizes: Model 0, Model 1, and Model 2. The right one for you depends on your age, whether you’ve been pregnant, your cervix height, and the width of your vaginal canal. Most people can narrow it down quickly using those four factors.
The Three Diva Cup Sizes
Model 0 is designed for teens aged 13 to 18. It’s the smallest option and features extra grip ridges to make removal easier for first-time users. If you’re a teenager or have a notably slim vaginal canal, this is your starting point.
Model 1 is the mid-range size, suited for people with a medium to heavy flow who haven’t given birth. It works well for most adults under 35 who are new to menstrual cups or have been using them for a while.
Model 2 is the largest size, recommended for people over 35 or those with a wider vaginal canal. It’s also the go-to for anyone who’s been through a full-term pregnancy or vaginal delivery, since both can relax the pelvic floor muscles that help hold a cup in place.
Why Pelvic Floor Tone Matters
The sizing isn’t really about flow volume alone. It’s mostly about fit, and fit depends largely on pelvic floor muscle tone. These are the muscles that surround and support your vaginal canal. When they’re tighter, a smaller cup creates a better seal. When they’re more relaxed, a larger cup is needed to sit securely and prevent leaks.
Two things naturally relax the pelvic floor over time: age and pregnancy. Carrying a baby to full term stretches these muscles regardless of whether you delivered vaginally or by C-section, though vaginal delivery has a greater effect. That’s why the standard recommendation bumps you up to Model 2 after a full-term pregnancy.
Here’s the catch: exercise can counteract that. If you’re over 35 but very physically active, or you do regular pelvic floor exercises, you may not need the larger size at all. Your muscle tone could still support a Model 1 perfectly well. The age and pregnancy guidelines are useful starting points, not rigid rules.
How to Measure Your Cervix Height
Cervix height is the factor most people overlook, and it can make or break your experience with a menstrual cup. A cup that’s too long for your anatomy will stick out past the vaginal opening and cause irritation. One that’s too short may sit uncomfortably low or be harder to reach for removal.
To measure, insert your index finger into your vagina and feel for the tip of your cervix. It feels like the tip of a nose: firm, round, and slightly raised. Note how far your finger went in, then compare that length against a measuring tape. The best time to do this is during your period, when the cervix sits at its lowest point. For the most accurate reading, measure on both the first and last day of your period and use the shorter measurement.
Your results fall into three ranges:
- Low cervix (44 mm / 1.4 inches or less): A standard menstrual cup may not work for you. It’s likely to protrude past the vaginal opening or feel like you’re hitting a wall during insertion. A menstrual disc is a better option in this range.
- Medium cervix (45 to 55 mm / 1.8 to 2.25 inches): A Diva Cup Model 1 should fit comfortably without sticking out past the labia. This is the sweet spot for most cup users.
- High cervix (above 55 mm / 2.25 inches): You’ll do well with a cup that has a longer catch basin. Both Model 1 and Model 2 work here, and the choice comes down to your age, pregnancy history, and canal width.
Choosing Based on Vaginal Canal Width
If you’ve measured your cervix and it’s in a comfortable range for a cup, the next consideration is width. A slim vaginal canal pairs best with Model 0, even if you’re older than 18, because the narrower diameter creates a more comfortable fit. A wider canal, which is common postpartum, calls for Model 2 to maintain a proper seal.
You won’t have an exact measurement for this, but you can get a sense from your experience with tampons or other insertable products. If regular-sized tampons feel snug, you likely have a narrower canal. If they’ve always felt small or you’ve never had trouble with larger sizes, your canal is probably average or wider.
Signs You Picked the Wrong Size
Even with careful measuring, sometimes the first size you try isn’t right. A cup that’s too large can press against your bladder and create a constant urge to pee, or it may feel uncomfortable and difficult to insert. A cup that’s too small will slide down, fail to form a seal, and leak consistently, even when it’s not full.
Occasional leaking during your heaviest day doesn’t necessarily mean the wrong size. It could mean the cup wasn’t fully open after insertion or wasn’t positioned correctly around the cervix. But if you’re leaking regularly despite proper placement, or if you feel persistent pressure or discomfort, try a different size. Some people also find that their needs change over time, after pregnancy, with age, or as their activity level shifts, so a size that worked for years may eventually need an update.
Quick Reference by Profile
- Teen, ages 13 to 18, no pregnancies: Model 0
- Adult under 35, no full-term pregnancies, medium to high cervix: Model 1
- Adult over 35, or any age after a full-term pregnancy, wider canal: Model 2
- Very active adult over 35 with strong pelvic floor, no pregnancies: Model 1 may still work
- Any age with a cervix height under 44 mm: Consider a menstrual disc instead of a cup