If the egg sinks or stays at the bottom, it is still fresh. An older egg will either stand on its end or float. The float test works because air builds up inside the egg as it ages, and this increases its buoyancy. However, an egg that floats may still be safe to eat.

Why are my boiled eggs floating?

An egg can float in water when its air cell has enlarged sufficiently to keep it buoyant. This means the egg is older, but it may be perfectly safe to use. ... A spoiled egg will have an unpleasant odor when you break open the shell, either when raw or cooked.

Do hard boiled eggs sink or float when done?

No. Old eggs tend to float, whether raw or boiled, as they have lost moisture and their density has decreased. Fresh eggs sink in water, whether raw or hard boiled. ... If it is cracked, but still has substance inside, then it's boiled or cooked.