07/29/2026
Do you know how much blood you actually lose during your period? Most people have no idea and that’s exactly why heavy bleeding goes undiagnosed for years.
The average is about 30–40 mL per cycle. That’s 2 to 3 tablespoons. Total. For the whole period.
More than 80 mL (about a third of a cup ) is heavy menstrual bleeding. That’s not “just a bad period.” It’s a diagnosis, and it has treatable causes.
How to estimate with what you already use:
🩸 Fully soaked regular pad or tampon ≈ 5 mL
🩸 Fully soaked super pad or tampon ≈ 10 mL
🩸 Most menstrual cups hold 20–30 mL and have measurement lines
🩸 80 mL ≈ 16 fully soaked regular products in one cycle
Talk to your doctor if:
you’re soaking through a pad or tampon every hour for several hours,
doubling up on protection,
setting an alarm to change products overnight,
passing clots bigger than a quarter,
bleeding longer than 7 days, or
filling a menstrual cup every 2–3 hours.
And if you’re exhausted, dizzy, short of breath, or craving ice: these can be signs of anemia
Fibroids, polyps, adenomyosis, thyroid disease, and bleeding disorders are all treatable.
Heavy bleeding is common, but common is not the same as normal.
You don’t have to plan your life around your period.
📚 The 30–40 mL average and the 80 mL cutoff come from Hallberg et al., Acta Obstet Gynecol Scand 1966 — the population study that still defines the threshold today. ACOG uses >80 mL per cycle to define heavy menstrual bleeding, but also emphasizes that bleeding counts as heavy if it disrupts your quality of life you don’t have to hit a number to deserve care.
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Educational content, not medical advice. Talk to your own doctor about your bleeding.
