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# How long does it take for an egg shell to decompose?

Updated: 9/14/2023

Wiki User

12y ago

I would say about a million years. When I was younger, my family did an experiment, trying to see how long it took an egg shell to break down. It still hasn't to this very day. I was about nine, and am now 59, so I wouldn't give it another thought. Hope this information helps.

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The answer depends on where the eggshell is placed. The existence of fossil dinosaur eggs shows they can last a long time. However, if the eggshell is added to a typical compost pile it will decompose as soil bacteria feed on it. (see http://www.paleo.ku.edu/palaios/25/5/smith.pdf)

However, if the eggshell is left on a shelf in your house then it could be there well past 50 years.

Wiki User

12y ago

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Q: How long does it take for an egg shell to decompose?
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