Science Of...

How Many Atoms Are In Your Body?

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The estimate of seven billion billion billion atoms per human body was made for a person who weighs 70 kg (154 lbs), so your results may vary! 99% of these atoms would be hydrogen, oxygen, and carbon—the rest are trace elements. And let's not forget, the vast majority of these atoms came from stars that exploded billions of years ago.

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Key Facts In This Video

  1. A human body is made up of around seven billion billion billion atoms. 00:21

  2. There are an estimated 10 to the power of 50 atoms on Earth. 00:53

  3. It's estimated that there are 10 to the power of 80 atoms in the observable universe. 01:14