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The number of cells can be estimated by the average mass of a cell compared to the average mass of the body, and works out to between 5 trillion and 100 trillion, depending on the person's age and body size. Larger individuals may not have more cells, just larger ones, or more fluid between them.

So for adults the average is about 50 trillion cells (5 x 1013).

As an example, every square centimeter of skin contains about 100,000 skin cells.

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Estimates vary, but are generally in the range 1013 to 1014, a 1 followed by either 13 or 14 zeros. The US number is 10 to 100 trillion (short scale).

Our bodies also have as many as 10 to 20 times as many bacteria as we have cells.

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12y ago

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