• Question: what is the average amount of red blood cells in the human body?

    Asked by xX_samafamalama_Xx to Chris, Josh, Rebecca, Rob, Susan on 22 Jun 2015.
    • Photo: Rebecca Dewey

      Rebecca Dewey answered on 22 Jun 2015:

      Adult humans have approximately 20,000,000,000,000 to 30,000,000,000,000 red blood cells in the body. Women will have nearer the smaller end of that range, while men will have nearer the larger end of that range. Children and teenagers will have slightly fewer.

    • Photo: Josh Meyers

      Josh Meyers answered on 22 Jun 2015:

      Average red blood cell counts are:
      Male: 4.7 to 6.1 million cells per microlitre
      Female: 4.2 to 5.4 million cells per microlitre

      The average litres of blood in a human is 4.7 litres.

      Therefore the human body has between
      22,090,000,000,000 and 28,670,000,000,000 red blood cells in men and
      19,740,000,000,000 and 25,380,000,000,000 red blood cells in women.

      These numbers obviously change according to many factors such as height and weight!

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