Daily How Much

Most adults carry about 5 liters of blood, close to 7–8% of body weight.

An average adult carries around 5 liters of blood, with normal ranges running from about 4.5 to 6 liters based on body size.

Most adults carry about 4.5–5.5 liters of blood, and total volume rises with body size and pregnancy.

A typical adult heart moves about 7,000 liters (around 1,850 gallons) of blood in 24 hours, with the total shifting with body size and activity.

An adult heart moves about 7,500 liters (2,000 gallons) of blood in 24 hours at rest.

A healthy adult heart often pumps around 5 liters per minute at rest, and it can rise near 20 liters per minute during all-out effort.

Most periods total 30–80 mL of blood, and heavier bleeding often shows up as repeated soak-throughs, larger clots, or low energy.

Most periods total 30–80 mL of blood per cycle, while the rest of what you see is mainly uterine lining and fluid.

Many adults faint after losing about 20–30% of blood volume (often 1–1.5 L), and a fast bleed can trigger collapse sooner.

A standard whole-blood donation is one pint (often 470 mL), plus a few small sample tubes drawn for testing.