How to check if an egg is fresh: 4 reliable tests
updated 11 July 2026
Quick answer
The fastest way to check an egg's freshness is in water. Put it in a glass of cold water: a fresh egg lies flat on the bottom, an older one stands upright with the pointed end down, and a spoiled one floats to the surface. Cracked open, a fresh egg has a firm, thick white and a tall, domed yolk. If you smell a sulfurous odor after cracking, throw the egg out without hesitation.
Step by step
- 1
Do the water test
Pour about 10 cm (4 inches) of cold water into a tall glass and gently drop the egg in. A fresh egg sinks and lies horizontally on the bottom. A slightly older one stands upright, resting its pointed end on the bottom while the blunt end rises. If the egg hovers just below the surface or floats on top, it's old or spoiled and better thrown out. This check takes seconds and requires nothing but a glass of water.
- 2
Crack the egg onto a plate
Instead of cracking the egg straight into a bowl, break it onto a flat plate. A fresh egg has a thick, firm white that stays close to the yolk, and a tall, domed yolk. The older the egg, the more the white spreads and turns watery, and the flatter and more fragile the yolk becomes. A runny white means the egg is past its prime, but by itself it doesn't yet mean it's spoiled.
- 3
Smell the contents
Smell is the most reliable signal. A fresh egg smells neutral or of almost nothing. A spoiled one gives off a distinct, sulfurous rotten-egg odor, noticeable the moment you crack it. If you smell it, don't try to save the egg and don't fry it. Throw it out, then wash the plate and your hands thoroughly.
- 4
Read the date and the code on the shell
You'll find the best-before date on the carton and the producer code on the shell itself. The first digit shows how the hen was kept: 0 is organic, 1 free-range, 2 barn, 3 caged. Then comes the country code, for example PL, and the farm number. The date helps you estimate age, but always confirm freshness with the water test and a smell check, because storage conditions matter a lot.
Why do eggs float? It's all about the air cell
An eggshell is porous, so water and carbon dioxide slowly escape through thousands of microscopic openings while air seeps in. Over time, a so-called air cell grows at the blunt end of the egg - a pocket of gas between the shell and the membranes.
The bigger the air cell, the lighter and more buoyant the egg. That's why a fresh egg with a small cell sinks and lies flat, an older one stands upright, and a very old one floats. So the water test doesn't measure spoilage directly, only the egg's age. When an egg floats, always confirm the verdict by smelling it after cracking.
How to store eggs so they stay fresh longer
Keep eggs in the fridge, but not in the door. Every time the door opens, the temperature there jumps, and those swings speed up aging. The middle or top shelf is best, where it's cold and stable. Leave the eggs in their original carton, because it protects them from foreign smells and from drying out.
Store eggs pointed end down. That keeps the air cell at the top and the yolk centered, away from the shell, so the eggs lose quality more slowly. Don't wash eggs before storing them, because water removes the shell's natural protective layer and makes it easier for bacteria to get in. Wash them just before use.
Freshness and cooking: why very fresh eggs are harder to peel
There's a paradox here. Very fresh hard-boiled eggs peel the worst, because their white has a lower pH and clings tightly to the membrane under the shell. Bits of shell then come off together with the white. If you're planning hard-boiled eggs for a salad, pick ones that are a few days old, not straight from the hen.
Eggs past their best-before date don't always belong in the trash. If they pass the water test and have no off smell, they'll do fine in baking and in dishes with long, thorough cooking, for example in cake batter, an omelet, or a casserole. What counts is cooking or baking them through. For dishes with raw eggs, like mayonnaise or homemade eggnog, use only fresh ones.
Frequently asked questions
›How do I check if eggs are fresh without putting them in water?
Crack the egg onto a plate and look at the white and the yolk. A fresh egg has a thick, firm white and a tall, domed yolk. A runny, watery white and a flat yolk mean an older egg. Finally, smell the contents: a sulfurous odor means the egg is spoiled and has to go.
›How does the egg water test work?
Place the egg in a glass of cold water. A fresh one lies flat on the bottom, one a few weeks old stands upright with the pointed end down, and a spoiled one floats to the surface. The reason is the air cell, which grows with age and makes the egg more buoyant.
›Can you eat eggs past their date?
The date on the carton is a best-before date, not a hard cutoff. If the egg passes the water test and has no off smell, you can eat it, but only well cooked or baked. For dishes with raw eggs, use only fresh ones.
›How long do eggs stay fresh in the fridge?
Kept in the fridge, eggs usually hold good quality for about 3 to 5 weeks. Go by the date on the carton and verify quality with the water test. Store them on a shelf, not in the door, pointed end down and in the original carton, and they'll stay fresh longer.
›What do the digits on an eggshell mean?
The first digit of the code is the farming method: 0 means organic, 1 free-range, 2 barn, 3 caged. It's followed by the country code, for example PL, and a number identifying the specific farm.