Can You Compost Egg Shells?

Yes, egg shells can be used as a compost material. Egg shells would be considered brown compost matter (source of carbon).

Egg shells are great for composting because they are a rich source of calcium and other essential minerals. Before burying the egg shells into the compost, one good tip is to bake the egg shells and crush them into smaller pieces. This will speed up the composting process.

Reference: http://msue.anr.msu.edu/news/adding_eggshells_to_compost

Egg Shell Compost