Daily How Much

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.

An average adult heart moves about 7,000–7,500 liters of blood in 24 hours at rest.

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

Adult kidneys receive about 1,200 mL of blood each minute, so roughly 1,700 liters pass through them in a day.

Most people lose about 30–60 mL of blood in one cycle; over 80 mL is classed as heavy menstrual bleeding.

An average adult carries a bit over 5 liters of blood, and day-to-day health depends on keeping enough volume to move oxygen and heat around.