Food Shelf Life Calculator

Enter your food category, storage method, and the date you purchased or prepared the food. The calculator uses standard food safety guidelines (from sources like the USDA) to estimate the total shelf life for that food under the selected storage condition, then computes how many days remain and what percentage of freshness is left.

No — sell-by, best-by, and use-by dates are different. Sell-by dates guide retailers on how long to display a product; food is often still safe to eat after this date. Best-by indicates peak quality. Use-by (or expiration) is when the manufacturer recommends discarding the product. When in doubt, rely on smell, texture, and appearance alongside these dates.

Add the expected shelf life (in days) for the food category and storage method to the production or purchase date. For example, cooked leftovers stored in the refrigerator last about 3–4 days, so if you cooked on Monday, plan to consume by Thursday or Friday.

Freezing dramatically extends shelf life — often by 3 to 12 months depending on the food. Raw poultry lasts 1–2 days in the fridge but up to 9 months in the freezer. The key is maintaining a consistent 0°F (-18°C) and using proper airtight packaging to prevent freezer burn.

Often yes — eggs can remain safe for 3–5 weeks after purchase when stored properly in the refrigerator. You can do a float test: place the egg in a bowl of cold water. If it sinks and lays flat, it's fresh. If it floats, discard it. Always check for off-odors before using.

Water activity (aw) measures how much free moisture is available in a food for microbial growth. Foods with low water activity (like dried pasta, crackers, or jerky) last much longer than high-moisture foods. A value below 0.6 generally prevents most microbial spoilage, which is why dried and canned goods have such long shelf lives.

Meat, poultry, seafood, dairy products, cooked leftovers, cut fruits and vegetables, and any food containing eggs should always be refrigerated after opening or preparation. The USDA recommends the '2-hour rule' — perishables left out longer than 2 hours (or 1 hour above 90°F) should be discarded.

Trust your senses: look for visible mold, unusual discoloration, or slimy texture; smell for sour, rotten, or off-putting odors; and notice any unusual flavors. Some harmful bacteria (like Salmonella or Listeria) don't change the appearance or smell of food, so always follow safe storage time guidelines even if food looks fine.