Can You Compost Eggshells? Discover the Facts and Tips for Effective Composting

Can You Compost Eggshells? The Ultimate Guide

Eggshells are a common household waste item that often raises the question of whether they can be composted. In this comprehensive guide, we’ll delve into the world of composting eggshells and provide you with all the information you need to know.

Why Should You Consider Composting Eggshells?

Composting is an eco-friendly way to dispose of organic waste while creating nutrient-rich soil for your plants or garden. When it comes to eggshells, they offer several benefits when added to your compost pile:

  • Nutrient Boost: Eggshells are primarily composed of calcium carbonate, which is essential for plant growth and development. Adding them to your compost enriches it with valuable nutrients.
  • pH Balance: As eggshells decompose, they can help balance the pH levels in your compost pile, creating an optimal environment for microorganisms.
  • Aeration and Drainage: The porous structure of crushed eggshells promotes better airflow and drainage in your compost heap, preventing it from becoming too compact or waterlogged.

The Dos and Don’ts of Composting Eggshells

To ensure successful decomposition and avoid any potential issues during the composting process, follow these dos and don’ts when dealing with eggshells:


  1. Rinse Thoroughly: Before adding them to your compost bin or heap, make sure you rinse off any remaining egg residue stuck inside the shells; this helps prevent attracting pests.
  2. Crush Them: Eggshells decompose faster when crushed into small pieces, as this increases the surface area available for microbial activity.
  3. Add Gradually: Incorporate eggshells into your compost pile gradually to avoid overwhelming it or disrupting the carbon-to-nitrogen ratio. A few shells each time you add organic waste should suffice.


  1. Avoid Boiling Water: Some suggest boiling eggshells before adding them to compost, but doing so might remove beneficial nutrients. It’s best to skip this step and add them directly.
  2. Avoid Adding Whole Shells: Whole eggshells take significantly longer to decompose compared to crushed ones. Breaking them down helps speed up the process.
  3. Avoid Overdoing It: While eggshells offer benefits, they should be added in moderation. Excessive amounts can alter the pH balance of your compost pile or attract pests like rodents.

Tips for Effective Composting with Eggshells

To make the most out of composting with eggshells, consider these tips for a smooth and efficient process:

  • Create Optimal Conditions: Maintain a balanced carbon-to-nitrogen ratio (C:N) by incorporating other green and brown materials in addition to eggshells. Aim for a C:N ratio of around 30:1.
  • Fine Grinding Option:

If you’re looking to expedite decomposition further, consider grinding your clean and dry eggshell fragments using a blender or spice grinder until they reach a fine powder-like consistency.

  • Mix Well:

    Ensure proper mixing and aeration within your compost pile by layering the eggshells with other organic materials, such as fruit and vegetable scraps, dry leaves, or grass clippings.

  • Monitor Moisture Levels:

    Keep an eye on the moisture content of your compost. Eggshells are dry materials; therefore, you may need to balance their addition with moist green matter or occasional watering.

  • The Verdict: Composting Eggshells is Beneficial

    In conclusion, composting eggshells is not only possible but also highly beneficial for your garden and the environment. By following the dos and don’ts mentioned above, you can effectively incorporate eggshells into your compost pile while enjoying enhanced nutrient levels and improved soil quality. So go ahead – start composting those eggshells today!