Daily How Much

Most periods shed about 30–40 mL of blood, while heavy bleeding is often described as 80 mL or more across one menstrual cycle.

A DIVA™ Cup holds 22–30 mL of fluid by model, which is roughly 4–6 regular tampons’ worth of flow.

An adult cow carries roughly 35–45 liters (9–12 gallons) of blood, with the total shifting with body weight, breed, and hydration.

Most adults carry about 4.5–5.5 liters of blood, with body size, sex, and pregnancy shifting that range.

Most adults carry about 5 liters of blood, near 7–8% of body weight, with size, sex, and pregnancy shifting the total.

Most adults carry about 4.5–5.5 liters of blood, with body size, sex, and pregnancy shifting the range.

A standard whole-blood donation is about one pint (470 mL), plus a few small test tubes taken at the same time.

Most people lose 30–40 mL of blood per period, with total menstrual fluid often closer to 60–80 mL.

Most people lose 30–40 mL of blood per period, and loss over 80 mL is often classed as heavy bleeding.

Most periods add up to 30–80 mL of blood total, and “heavy” bleeding is often linked with totals above 80 mL per cycle.