How many blood cells does a person have?
Humans have so many blood cells that one can hardly imagine the absolute number. Just how many erythrocytes there are in a microliter of blood is beyond imagination. The absolute number of course depends on the amount of blood, which in turn depends on the body weight.
These blood cells exist
- Not all blood cells are created equal. By far the largest part of the cells in the blood make up the erythrocytes, the red blood cells, at over 99 percent.
- In addition to the erythrocytes, there are also the leukocytes, the white blood cells. At less than one percent, they make up a very small proportion of the blood. However, humans have far more leukocytes than can be counted in the blood - because most of the leukocytes - around 90 percent - are in the bone marrow and tissues.
That's how many erythrocytes a person has in their blood
- First of all, you have to look at how many red blood cells there are to count in a microliter of human blood: on average, that is an unbelievable 5 million cells. Women have slightly fewer erythrocytes than men, so the range of a healthy adult ranges from 3.5 to just under 6 million. For the sake of simplicity, the calculation should continue with 5 million.
- The amount of blood varies from person to person. A blood volume of 5 liters is assumed here, which corresponds to about 70 kilograms of body weight. However, a volume of 7 liters of blood - for example in a large, strong man - is still quite normal.
- With the knowledge of how many liters of blood a person has and how many red blood cells there are in one Microliters, you can calculate the absolute number yourself: One liter equals 1,000,000 (106) Microliters. So a relatively light person has 5 million microliters of blood. 5 million times 5 million is 25 trillion. This is how many erythrocytes there are in a person at the assumed values.
- Humans have around 4,000 to 10,000 leukocytes in their blood. Assuming 5 liters of blood, this makes absolute values of 20 to 50 billion leukocytes in the blood. But if you consider that this is only about 10 percent of the leukocytes, the result is between 200 and 500 billion leukocytes.
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