How many red blood cells are in the human body?

Each microliter of blood has on average 5 million red blood cells, 7 thousand white blood cells and 300 thousand platelets. Average total blood volume is 5 L. Thus there are about 25.3 trillion (American usage) or 2.53 x 10exp13 cells in healthy human beings (this only includes circulating blood cells). read more

Adult humans have roughly 20-30 trillion red blood cells , at any given time. Women have roughly 4 to 5 million red blood cells per microliter of blood, whereas men have about 5 to 6 million per microliter of blood. Red blood cells comprise approximately 70% of total human body cell number. read more

Lymphoma: A form of blood cancer, in which white blood cells multiply abnormally inside lymph nodes and other tissues. The enlarging tissues, and disruption of blood's functions, can eventually cause organ failure. Anemia: An abnormally low number of red blood cells in the blood. read more

And the team’s human cell count, which more or less jibes with one of the best-ever estimates, cleverly takes advantage of the fact that, by count, we’re mostly red blood cells. The story of the ten-to-one ratio has all the characteristics of an academic urban legend. read more

Look at a beaker of blood, for example, and you’ll find that the red blood cells are packed tight. If you used their density to estimate the cells in a human body, you’d come to a staggering 724 trillion cells. Skin cells, on the other hand, are so sparse that they’d give you a paltry estimate of 35 billion cells. read more