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Most people lose about 30–40 mL of blood per cycle; heavy bleeding is often 80 mL or more.

A whole-blood donation is about one pint (450–470 mL), plus a few small sample tubes for testing.

An adult heart pushes around 7,000–8,500 liters of blood per day at rest, with the total rising a lot during exercise, heat, or illness.

An adult heart moves roughly 7,000 liters (near 2,000 gallons) of blood in 24 hours, with wide swings based on size, fitness, and activity.

Most adults carry about 4.5–5.5 liters (1.2–1.5 gallons) of blood, with size, sex, and pregnancy shifting that range.

Most adults carry about 4.5–5.7 liters (1.2–1.5 gallons) of blood, with body size and pregnancy shifting the total.

Most people lose about 30–80 mL of menstrual blood per period; soaking a pad or tampon in an hour for 2+ hours is a warning sign.

Implantation spotting is usually a few small smears or drops—often seen on toilet paper or a liner—lasting hours to 2 days, not a pad-level flow.

Most periods lose 30–80 mL total; soaking pads hourly or big clots can mean the flow is heavier than expected.

An adult heart moves around 7,000–8,000 liters of blood in 24 hours at rest, and that total can rise a lot during active hours.