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An average adult carries about 1.2 to 1.5 gallons of blood, which equals roughly 7–8% of total body weight.

A standard whole-blood donation collects about one pint (450–500 mL), along with a few small tubes used for lab testing.

A standard whole-blood donation is about 1 pint (450–500 mL), with a few small sample tubes drawn at the same time.

A typical mosquito meal is measured in microliters, often 1–5 µL, so the bite feels loud while the blood loss stays small.

Most people lose around 2–3 tablespoons (30–80 mL) of menstrual blood per cycle, even if a pad makes it look like more.

Most visits collect roughly 690 mL of plasma while your red cells are returned, so you do not lose a full-blood unit.

Most people lose around 20–90 mL of blood across an entire period, with many landing near 30–80 mL.

Most adults carry around 5 liters (10 pints) of blood, with total volume shifting with body size, sex, and life stage.

A standard whole blood donation collects about 470 mL (around one pint), plus a few small tubes used for lab testing.

Most periods shed about 30–40 mL of blood across the whole cycle, with a wide normal range that can run from about 20 to 90 mL.