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Most adults carry around 4.5–5.5 liters of blood, with body size, sex, age, and pregnancy shifting the total.

Many people shed 30–60 mL of fluid per cycle, with blood closer to 5–30 mL.

A “super” tampon is labeled for 9–12 grams of absorbency, which lines up with about 9–12 mL of lab test fluid and often a bit less blood by volume.

Most people lose about 30–40 mL of blood per period, while heavy bleeding is often defined as over 80 mL in a cycle.

An adult heart at rest usually moves about 5–6 liters of blood each minute, with swings based on body size, fitness, and activity.

Most standard tampons hold about 6–18 mL of menstrual flow, depending on the absorbency label and how fully it’s saturated.

Most cycles shed about 30–40 mL of blood in total, while blood loss above 80 mL is commonly used as a heavy-bleeding cutoff.

Most periods add up to about 30–80 mL of blood total, with heavier flow often showing up as frequent pad or tampon changes or clots.

Blood volume often rises about 30–50% during pregnancy, with the peak usually in the third trimester.

Most periods involve around 30–40 mL of blood total, with heavier bleeding often defined at more than 80 mL across one cycle.