{"id":104624,"date":"2026-08-12T11:11:16","date_gmt":"2026-08-12T09:11:16","guid":{"rendered":"https:\/\/sileu.com\/menstrual-cup-heavy-flow-capacity-ml\/"},"modified":"2026-09-24T02:11:25","modified_gmt":"2026-09-24T00:11:25","slug":"menstrual-cup-heavy-flow-capacity-ml","status":"publish","type":"post","link":"https:\/\/sileu.com\/en\/menstrual-cup-heavy-flow-capacity-ml\/","title":{"rendered":"Menstrual Cup for Heavy Flow: Real Capacity in ml"},"content":{"rendered":"

Does your cup fill up before 12 hours and you don’t know whether that’s normal or you need a different model? You’re not alone: it’s the number-one question for anyone looking at a menstrual cup for heavy flow<\/strong>. The good news is that capacity isn’t a marketing mystery \u2014 it’s measured in milliliters, just like a glass, and here are the real figures so you can choose based on data rather than guesswork.<\/p>\n

Menstrual cup for heavy flow: how much is “heavy” in ml<\/h2>\n

Before comparing cups, you need to know what amounts we’re dealing with. In a normal cycle, a woman loses on average 30 to 40 ml of blood in total over 4-5 days, although the range considered physiological goes up to about 80 ml<\/a>. Menorrhagia, or heavy bleeding, is when you lose more than 80 ml per cycle or when large, persistent clots appear<\/a>: if that’s your case, talk to your gynecologist, because it can have treatable causes (fibroids, hormonal imbalances) and a cup alone doesn’t replace that diagnosis.<\/p>\n

That said, most people searching for a “menstrual cup for heavy flow” don’t have menorrhagia: they simply have an intense day 2-3 in their cycle when the cup fills up sooner than they’d like, and they want one that lasts longer without emergency emptying in a public restroom.<\/p>\n

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For heavy days: Sileu Sport L \u2014 \u20ac14.99<\/strong><\/p>\n

Our firmest cup, 30 ml up to the air holes and 34 ml to the rim, designed for intense physical activity and very heavy flow. Medical-grade silicone certified to ISO 10993. Shipped from Spain in 24-72h.<\/p>\n

See the Sileu Sport \u2192<\/strong><\/a><\/p>\n<\/div>\n

Real capacity in ml of Sileu cups<\/h2>\n

These are the real capacities of the models in the Sileu cup range<\/a> most often considered for heavy flow. The useful figure is the capacity up to the air holes: the capacity to the rim is the theoretical maximum, and in normal use it’s best to empty the cup before reaching it.<\/p>\n

\n\n\n\n\n\n\n\n\n\n
Model and size<\/th>\nUp to the air holes<\/th>\nTo the rim<\/th>\nRecommended for<\/th>\n<\/tr>\n<\/thead>\n
Sileu Bell L<\/td>\n20 ml<\/td>\n25 ml<\/td>\nLight-moderate flow, low cervix<\/td>\n<\/tr>\n
Sileu Classic S<\/td>\n25 ml<\/td>\n29 ml<\/td>\nModerate flow<\/td>\n<\/tr>\n
Sileu Classic L<\/strong><\/td>\n30 ml<\/strong><\/td>\n34 ml<\/strong><\/td>\nHeavy flow<\/strong><\/td>\n<\/tr>\n
Sileu Sport S<\/td>\n28 ml<\/td>\n32 ml<\/td>\nHeavy flow without a vaginal birth, sport<\/td>\n<\/tr>\n
Sileu Sport L<\/strong><\/td>\n30 ml<\/strong><\/td>\n34 ml<\/strong><\/td>\nVery heavy flow or intense sport<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n

For context: if your heaviest day is around 15-20 ml in 12 hours (typical even with heavy periods), a Sileu Classic L<\/a>, with 30 ml up to the air holes, gives you plenty of margin. If you also play sports or your cycle is especially intense, the Sileu Sport L<\/a> offers the same capacity with a firmer silicone that holds its seal under effort. And if you haven’t had a vaginal birth, the Sport S is worth a look: with 28 ml, it’s the size S with the most capacity in the range.<\/p>\n

Classic L vs Sport L: how they really differ<\/h2>\n
\"Sileu
Sileu Classic (medium flexibility) and Sileu Sport (the firmest), the two candidates for heavy periods.<\/figcaption><\/figure>\n

It’s not just about ml: firmness matters too. The Sileu Classic<\/strong> has medium flexibility that suits most bodies and is the default choice if you have no particular reason to choose something else. The Sileu Sport<\/strong> is the firmest in the range: being less flexible, it opens with more force inside the vagina and seals better during intense movement, which reduces the risk of leaks when you run, swim or train on your heaviest days.<\/p>\n

If you have a trained pelvic floor or haven’t had a vaginal birth, size S may be enough even with heavy flow; if you’ve had a vaginal birth or notice the cup moving, size L usually fits better. Our guide to menstrual cup sizes<\/a> explains it in more detail if you’re still torn between S and L.<\/p>\n

Tricks to last longer without leaks on heavy days<\/h2>\n
\"Menstrual
Small placement adjustments make a difference on your heaviest days.<\/figcaption><\/figure>\n