Don't Toss Those Eggshells: 17 Ways to Reuse Them (Your Plants, Drains, and Skin Will Thank You)

Let me tell you about the week I became an eggshell hoarder.

It started with a single conversation. A friend who gardens mentioned that she saves every single eggshell. Every. Single. One. She has a little bucket on her counter just for shells. I laughed and said, "That's... a lot of eggshells." She looked at me like I'd just admitted to throwing away gold.

"You have no idea what you're throwing away," she said.

She was right.

Most people toss eggshells straight into the trash without thinking twice. But what if those fragile shells could actually become one of the most useful tools in your home?

In today's world, where sustainable living, eco-friendly habits, and zero-waste kitchens are gaining popularity across the U.S., simple changes can make a big difference. Eggshells are packed with calcium and minerals, making them perfect for everything from gardening to cleaning—and even a few surprising household hacks.

I started saving my eggshells that week. I now have a dedicated jar in my freezer (pro tip: freeze them until you have enough to process). And I've learned more uses than I ever imagined possible.

Let me share 17 of my favorites—from the practical to the downright surprising.

First: How to Prepare Eggshells for Reuse

Before you start using eggshells, you need to prep them properly. Otherwise, they can attract pests, smell, or harbor bacteria.

The Simple Method:

Rinse: Rinse the eggshells thoroughly immediately after cracking to remove any egg white residue.
Dry: Spread them on a baking sheet and let them air dry completely, or bake at 200°F (95°C) for 10–15 minutes. Baking ensures they are sterile and brittle, making them easier to crush.
Crush/Grind: Crush them by hand for garden use, or grind them into a fine powder in a blender/coffee grinder for cleaning or consumption.
Store: Keep in a sealed jar or container in a cool, dry place.

💡 Pro Tip: Keep a container in your freezer. Add rinsed eggshells as you use them. The cold prevents any odor. When the container is full, dry and crush them all at once.