There is no exact count, but a solid estimate is about 10 quintillion individual insects alive on Earth at any given time , and about 5.5 million insect species overall. Scientists have formally described a bit over 900,000 to 1 million species , so a large share is still undiscovered.

Quick Scoop

A simple way to think about it:

  • Individuals: roughly 10 quintillion alive at once.
  • Species: about 5.5 million estimated, with a wide uncertainty range.
  • Named species: around 900,000 to 1 million have been described.

Why it is hard to count

Insects are tiny, widespread, and constantly changing in number, so scientists estimate rather than count them directly. Different studies use different methods, which is why species estimates range from about 2 million to as high as 30 million in older sources, while newer analyses often center around 5.5 million.

A useful comparison

One recent estimate says there are around 1.4 billion insects for every person on Earth, which helps show how enormous the total really is. Another commonly cited figure is about 200 million insects per human at a given time, depending on the source and method used.

Bottom line

If you want the shortest answer: trillions upon trillions of insects live on Earth, with the best current estimate around 10 quintillion individuals and about 5.5 million species.