How long to defrost meat, chicken and fish safely
Frozen chicken left on the counter is a classic cause of food poisoning: the outside warms to room temperature while the middle is still solid. This defrost time calculator gives a safe thawing time for the weight and type of food you have, for each of the three methods food safety agencies accept: the refrigerator, cold water and the microwave. It also works back from the time you plan to cook, so you know when to take the food out of the freezer.
The figures follow the USDA Food Safety and Inspection Service guidance known as “The Big Thaw” (read 24 October 2026): about 24 hours in the refrigerator for every 4 to 5 lb, and about 30 minutes per pound in cold water with the water changed every 30 minutes. Microwave times are our own planning range because ovens differ.
How to use the Defrost Time Calculator
- Choose the food: whole chicken, pieces, turkey, roast, steaks, mince, fish or prawns.
- Enter the weight in pounds or kilograms, as printed on the pack.
- Pick the thawing method and enter the time you plan to start cooking.
- Read the thaw time and the time to begin. The other two methods are listed underneath for comparison.
Defrost Time Calculator features
Three safe methods
Refrigerator, cold water and microwave, each with its own rule.
Back-timed start
Tells you when to begin, including “3 days before” for big joints.
Storage after thawing
How long refrigerator-thawed meat keeps before cooking.
Metric and imperial
Weights in kilograms or pounds, with the equivalent shown.
The three safe ways to thaw
| Method | Time rule | After thawing |
|---|---|---|
| Refrigerator (4 °C / 40 °F or below) | About 24 h per 4–5 lb; a small pack still needs a full day | Keeps 1–2 days (poultry, mince, fish) or 3–5 days (red meat cuts); can be refrozen raw |
| Cold water | About 30 min per lb, water changed every 30 min | Cook immediately; do not refreeze raw |
| Microwave, defrost setting | Minutes per lb vary by oven; follow the manual | Cook immediately; do not refreeze raw |
Safety rules worth repeating
- Never thaw on the counter, near a heater or in warm water. Bacteria multiply quickly between about 4 °C and 60 °C (40–140 °F).
- Keep the raw juices contained. Thaw on a tray or in a bowl on the bottom shelf so nothing drips on other food, and wash hands, boards and sinks afterwards.
- Cold water needs a sealed package. Water that touches the meat makes it soggy and unsafe. Use cold tap water, never warm.
- Cook straight after cold-water or microwave thawing, because parts of the food may already have started to warm.
- Cooking from frozen is safe if you allow roughly half as much time again and check the centre reaches the safe temperature. Use the meat doneness chart for the target temperatures.
Related planners
For a whole turkey with sizing and roasting times, use the turkey thawing calculator. To check your microwave wattage against package instructions use the microwave wattage converter, and to schedule the whole meal use the meal timing planner.
Defrost Time Calculator FAQ
How long does it take to thaw frozen chicken?
In the refrigerator, about 24 hours for every 4 to 5 lb, so a 4 lb chicken needs a full day and a 10 lb bird 2 to 3 days. In cold water allow about 30 minutes per pound.
How long does it take to thaw a turkey?
About 24 hours per 4 to 5 lb in the refrigerator or 30 minutes per pound in cold water. A 15 lb turkey needs close to 4 days in the fridge. The turkey tool has a full back-timed plan.
Can I refreeze meat after thawing?
Meat thawed in the refrigerator can be refrozen without cooking, although quality drops. Food thawed in cold water or the microwave must be cooked first.
Is it safe to defrost meat on the counter overnight?
No. The surface spends hours at room temperature. Use the refrigerator, cold water or microwave.
Why does a small pack still need a day in the fridge?
Even a pound of mince or two chicken breasts take about 24 hours in the refrigerator, because the fridge is cold. Cold water is much faster for small packs.
Are these times exact?
No. Shape, thickness and packaging change them. Thin, flat packs thaw faster than thick blocks. Check by feel: there should be no ice crystals in the centre.