How to Test Egg Freshness in Under 60 Seconds

The Simple 60-Second Test to Check If Your Eggs Are Still Good

We’ve all been there: you’re ready to bake a cake or scramble some eggs, but the expiration date on the carton passed a few days ago. Before you throw them out—or risk cracking a bad egg directly into your mixing bowl—there is a foolproof, scientific way to check their freshness in under a minute. Here is how to perform the egg float test and read the results instantly.

What You Need

• A deep glass or bowl (clear glass works best so you can see clearly)
• Cold water
• Your eggs

Step-by-Step Instructions

Follow these quick steps to determine if your eggs are fresh, aging, or spoiled:

• Step 1: Fill the glass. Fill your glass or bowl with enough cold tap water to completely submerge the egg with an inch or two of clearance at the top.
• Step 2: Gently lower the egg. Carefully drop the egg into the water. Avoid dropping it from too high so it doesn’t crack against the bottom.
• Step 3: Observe its position. Watch how the egg behaves in the water. It will do one of three things, each telling you exactly how fresh it is.

How to Read the Results

The behavior of the egg in the water tells you everything you need to know about its age:

• It lies flat on the bottom: Your egg is very fresh. It is perfect for poaching, frying, or baking where structure matters.
• It stands upright on the bottom: Your egg is older but still perfectly safe to eat. As eggs age, they lose moisture, and the air pocket inside expands, tilting the egg. These eggs are ideal for hard-boiling, as the larger air pocket makes them much easier to peel!
• It floats to the surface: Your egg is spoiled and should be thrown away. The air pocket has become so large that the egg is completely buoyant. Do not eat this egg.

The Science Behind the Float Test

Why does this work? Eggshells are semi-permeable, meaning they have thousands of tiny pores. Over time, liquid inside the egg evaporates through these pores and is replaced by outside air. The older the egg, the more air enters, and the larger the internal air cell becomes. Eventually, the air pocket becomes large enough to act like a tiny life vest, causing the egg to float.

Two Alternative Freshness Tests

If you don’t have a bowl of water handy, you can use these two alternative methods to check your eggs:

• The Shake Test: Hold the egg up to your ear and gently shake it. If you hear a distinct sloshing sound inside, the egg is old and has developed a large air pocket. If you hear nothing, the egg is fresh.
• The Plate Test: Crack the egg onto a flat plate or saucer. A fresh egg will have a bright, plump, domed yolk and thick white (albumen) that clings closely around it. An old egg will have a flat yolk that breaks easily, and the white will be thin, watery, and spread out widely.