How many red cells we have in our body?

Question

How many red cells we have in our body?

Answer 1

Billions!

Answer 2

Adult humans have roughly 2–3 × 10^13 red blood cells at any given time (women have about 4 to 5 million erythrocytes per microliter (cubic millimeter) of blood and men about 5 to 6 million.

Answer 3

"Woman usually have 4-5 million erythrocytes per cubic millimeter of blood, men have 5-6 million."

"In an average healthy adult, the volume of blood is about one-eleventh of the body weight. Most sources state the volume of blood in an average human adult, who is between 150 to 160 pounds, as between 4.7 and 5 liters, although the more recent sources state the volume of blood in an average adult as 4.7 liters. Sources state that an 80-pound child had about half that amount, and an 8-pound infant has about 8.5 ounces. People who live at high altitudes, where the air contains less oxygen, may have up to 1.9 liters more blood than people who live in low altitude regions."

Answer 4

A normal person has between 20,000,000,000,000 and 30,000,000,000,000 red blood cells.