If you raise backyard chickens, making sure your hens get enough calcium is essential for strong, healthy eggshells. One of the easiest and most sustainable ways to add extra calcium to your chickens’ diet is by using the eggshells they already produce.

Instead of throwing eggshells away, you can recycle them into a natural calcium supplement for your flock. This simple habit not only supports your chickens’ health but also helps reduce waste in your kitchen.

For backyard chicken keepers and homesteaders, finding practical ways to reuse resources around the home is part of creating a more sustainable lifestyle. Using eggshells as a calcium supplement is one of the easiest ways to do just that.

Why Chickens Need Calcium

Calcium plays a critical role in egg production. When hens lay eggs, their bodies pull calcium from their diet to create the hard outer shell.

If chickens do not receive enough calcium, their bodies will begin pulling calcium from their bones instead. Over time, this can lead to health issues and weaker birds.

A lack of calcium in chickens can cause:

• Thin or fragile eggshells
• Soft-shelled or shell-less eggs
• Reduced egg production
• Weak bones in laying hens
• Increased stress during egg laying

Most commercial layer feeds are formulated with calcium included, but depending on your flock’s laying cycle, age, or breed, additional calcium may still be beneficial.

Providing extra calcium helps support healthy hens and consistent egg production.

Using Eggshells as a Natural Calcium Supplement

Eggshells are a natural source of calcium and can easily be recycled back into your chickens’ diet.

Instead of tossing them in the trash, you can turn them into a simple calcium supplement that supports your flock while reducing food waste.

Here is the method I like to use at home.

Step 1: Rinse the Eggshells

After cracking your eggs, rinse the shells well to remove any leftover egg white or yolk. This helps prevent odors and keeps the shells clean before drying.

Step 2: Dry the Eggshells

Place the clean shells on a baking sheet and dry them in the oven at a low temperature, around 150°F to 175°F.

Bake them for about 10 to 15 minutes until they are completely dry. Drying the shells removes moisture and makes them easier to crush.

Step 3: Grind the Eggshells

Once the shells have cooled, grind them into a fine powder. You can use a blender, food processor, coffee grinder, mortar and pestle, or even crush them by hand.

Grinding the shells into small pieces is important so chickens do not recognize them as eggs. If hens start associating eggs with food, it can sometimes lead to egg-eating habits.

Step 4: Add to Your Chickens’ Feed

Sprinkle the crushed eggshell powder over your chickens’ feed or mix it into their feed container.

Another option is to place the eggshell powder in a small dish inside the coop or run so hens can eat it when they need extra calcium.

Chickens are surprisingly good at regulating their mineral intake and will often consume additional calcium when their bodies need it.

Other Natural Sources of Calcium for Chickens

Eggshells are not the only way to supplement calcium for backyard chickens. Many chicken keepers offer a variety of calcium-rich options to help support egg production.

Some common calcium supplements for chickens include:

• Crushed oyster shells
• Limestone grit
• Commercial calcium supplements
• Layer feed formulated with added calcium
• Dark leafy greens such as kale or collard greens

Crushed oyster shells are one of the most common calcium supplements used by chicken keepers. They are inexpensive and widely available at farm supply stores.

Many flock owners like to keep oyster shells in a separate container so chickens can eat them freely as needed.

Offering multiple calcium sources can help ensure your hens always have access to what their bodies need for healthy egg production.

How Often Should You Give Chickens Extra Calcium?

If your chickens are eating a high-quality layer feed, they are already receiving a base level of calcium in their diet.

However, providing an additional calcium source is still a good practice for many backyard flocks.

Most chicken keepers offer calcium supplements free choice, meaning hens can eat it whenever they feel they need it.

This allows each chicken to regulate its own intake depending on its laying cycle and nutritional needs.

For example:

• Young pullets that have not started laying may eat very little calcium
• Older laying hens may consume more calcium regularly
• Chickens producing large eggs often need more calcium

Providing a dish of crushed eggshells or oyster shells allows hens to choose how much they need naturally.

Signs Your Chickens May Need More Calcium

If you raise backyard chickens, paying attention to egg quality can help you determine whether your flock needs more calcium.

Some common signs of calcium deficiency include:

• Thin eggshells that crack easily
• Eggs with soft shells
• Shell-less eggs
• Hens appearing weak or tired after laying

If you notice these signs, adding an additional calcium source to your flock’s diet may help improve eggshell quality.

It is also important to make sure chickens have access to fresh water and a balanced diet, since overall nutrition plays a major role in egg production.

How I Save Eggshells for My Chickens

On our homestead, saving eggshells has become a simple habit in my daily kitchen routine.

Whenever I crack eggs for cooking or baking, I immediately rinse the shells thoroughly and place them in a bowl in my kitchen. Once the bowl fills up, I dry the shells in the oven and grind them into a calcium powder for my chickens.

Cleaning the eggshells right away is an important step. Rinsing them prevents the shells from sticking together and helps avoid attracting bugs or creating unpleasant odors in the kitchen.

Once they are clean and dry, the shells crush easily and can be added back into my chickens’ feed as a natural calcium supplement.

It’s a small routine that helps reduce waste in our home while supporting the health of our flock.

Frequently Asked Questions About Calcium for Chickens

Can chickens eat eggshells?

Yes, chickens can safely eat crushed eggshells. Eggshells are made mostly of calcium carbonate, which is the same form of calcium commonly found in many commercial poultry supplements.

When eggshells are properly cleaned, dried, and crushed, they provide a natural way to support strong eggshell production. Many backyard chicken keepers regularly feed crushed eggshells back to their flock as part of a sustainable feeding routine.

Should eggshells be baked before feeding them to chickens?

Drying eggshells in the oven is a common method used by chicken keepers. Baking them at a low temperature helps remove moisture, makes them easier to crush, and helps sanitize the shells.

While some people air dry their eggshells instead, baking them at around 150°F to 175°F for 10–15 minutes is a simple and reliable way to prepare them before grinding.

Can feeding eggshells cause chickens to eat their eggs?

Chickens typically do not associate crushed eggshells with fresh eggs. Grinding the shells into small pieces or powder helps prevent hens from recognizing them as eggs.

If whole or large pieces of eggshell are offered, there is a small chance chickens could begin associating eggs with food. Crushing the shells well helps prevent this behavior.

What is the best calcium supplement for chickens?

There are several effective calcium sources for backyard chickens. The most common options include:

• Crushed eggshells
• Oyster shells
• Layer feed formulated with calcium
• Commercial poultry calcium supplements

Many chicken keepers offer crushed oyster shells in a separate container so hens can eat them whenever they need extra calcium.

Should chickens have free access to calcium?

Yes, most chicken keepers offer calcium supplements free choice. This means chickens can consume calcium whenever their bodies need it.

Laying hens often regulate their own calcium intake naturally. Younger chickens that are not laying eggs typically consume less calcium, while actively laying hens may eat more.

Providing calcium separately from regular feed allows each bird to take what it needs.

How can you tell if chickens need more calcium?

One of the easiest ways to spot calcium deficiency in chickens is by observing the eggs they lay.

Signs that chickens may need more calcium include:

• Thin eggshells
• Soft-shelled eggs
• Eggs that crack easily
• Shell-less eggs
• Hens appearing weak during laying

If you begin noticing these signs, offering an additional calcium source such as crushed eggshells or oyster shells may help improve eggshell strength.

A Simple Way to Reduce Waste on Your Homestead

Using eggshells as a calcium supplement is one of the easiest ways to support your flock while reducing waste in your kitchen.

Instead of throwing eggshells away, you can recycle them into a natural supplement that benefits your chickens and strengthens their eggshells.

Small habits like this are part of what makes backyard chicken keeping and homesteading so rewarding. With just a few simple steps, you can turn something that would normally be discarded into something useful for your flock.

Healthy chickens lead to stronger eggs, happier hens, and a more sustainable homestead.