Egg Storage Life & How Long Eggs Stay Fresh

It depends almost entirely on storage temperature. Eggs kept at around 4°C stay good for roughly 45 days; at cool room temperature they last a couple of weeks; in hot room heat they decline within days. Humidity matters too — this calculator estimates shelf life from your actual storage temperature and humidity.

Eggs lose quality as gases escape through the porous shell and the internal contents thin out, and that ageing speeds up with heat. Cooling slows every part of the process, which is why refrigeration extends shelf life from days to over a month. The hotter the store, the faster eggs lose grade and the shorter the safe window.

Aim for 70–80% relative humidity. Lower humidity lets eggs lose weight as moisture evaporates through the shell, shrinking the contents and enlarging the air cell; very high humidity risks mould. Holding 70–80% keeps weight loss slow without encouraging spoilage, so eggs stay heavier and fresher for longer.

It takes your storage temperature and humidity and maps them to an expected number of days table eggs stay at acceptable quality — long at cold, refrigerated temperatures and short in heat — then flags whether your temperature and humidity are in the good range and gives an overall quality rating.

They can for short periods in a cool room, but they age far faster than refrigerated eggs. In hot climates room storage gives only days of good quality. If you need to hold eggs for more than a few days — especially for sale or hatching-quality table use — cool storage near 4°C dramatically extends the safe window.

Washing removes the natural cuticle that helps seal the shell, so washed eggs lose quality faster and rely more on refrigeration to keep. Unwashed eggs with the cuticle intact keep better at cooler room temperatures. Either way, cold, humid storage gives the longest shelf life — this tool focuses on those storage conditions.

The air cell is the pocket of air at the blunt end of the egg. As an egg ages and loses moisture and gases, the contents shrink and the air cell enlarges — which is why old eggs float. Cold, humid storage slows moisture loss, keeping the air cell small and the egg fresher and heavier.

Hatching eggs need even tighter conditions — typically cooler than room temperature but warmer than 4°C, around 12–18°C, with high humidity, and they lose hatchability within about a week. This calculator is built for table-egg eating quality; for setting eggs use the Egg Incubation tools and store no more than a week.

Beyond the calculator's estimate, the float test helps: a fresh egg sinks and lies flat, an older one stands on end, and a spoiled one floats. Cracking into a clean dish, a fresh egg has a firm, raised yolk and thick white. Always discard eggs that smell off, regardless of the estimated days.

They're solid planning figures. Real shelf life varies with egg size and age at storage, shell quality, whether eggs were washed, and how steady your store stays. Use the estimate to plan turnover and stock rotation, keep storage cold and humid, and always check eggs before use — it's a guide, not a guarantee.