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A standard whole-blood donation removes 470 mL (just under a pint), and most healthy adults replace the fluid within 48 hours.

Most people lose 30–40 mL of blood per period; heavy bleeding is over 80 mL.

Most people lose 30–80 mL of blood in a period (about 2–5 tablespoons); bleeding above 80 mL is often treated as heavy.

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

An adult body replaces about 170 billion red cells each day, plus plasma, to keep total blood volume steady.

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.