The Egg Float Test
The float test is the easiest and most reliable way to check an egg's freshness without cracking it open.
Sinks to bottom and lies flat
Very Fresh (1–7 days old). Perfect for poaching, frying, and baking.
Stands upright at bottom
Slightly Older (2–3 weeks old). Safe to eat, great for hard boiling!
Floats to top of water
Spoiled / Bad. Discard immediately. Gas has built up inside the egg.
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The Science: Why Eggs Float
An eggshell contains roughly 17,000 tiny pores. Over time, moisture evaporates through these pores and air enters, expanding the small air pocket inside the wider end of the egg. The larger the air pocket gets, the more buoyant the egg becomes!
Freshness Test — FAQs
Common questions about checking if eggs are fresh.
Yes, an egg that floats all the way to the top of water is old and should be discarded. The air cell has expanded significantly due to moisture loss and gas exchange.
If an egg stands upright on the bottom of the water bowl, it is slightly older (2–3 weeks) but still completely safe to eat. Use it soon!
Yes! An egg that sinks and lies flat on its side is extremely fresh.