Defrost Time Calculator
Calculate how long it takes to safely defrost meat, poultry, fish, and other foods.
Covers refrigerator, cold water, and microwave methods.
Defrosting food correctly is a food safety issue, not just a cooking tip. Bacteria multiply rapidly in the “danger zone” — between 40°F (4°C) and 140°F (60°C). Improper thawing can cause serious illness even if you cook the food afterward.
The three safe methods:
1. Refrigerator thawing (safest)
- Temperature stays below 40°F (4°C) throughout
- Takes longer but requires no attention
- Food can remain in the fridge 1–2 more days before cooking
- Rule of thumb: allow 24 hours for every 4 to 5 lb (about 2 kg)
There is a floor to that rule which catches almost everybody. A single pound of ground beef or a couple of boneless chicken breasts still needs a full day in the fridge, not the five hours the per-pound arithmetic suggests. The USDA is explicit about it. Small packages thaw from the outside in just like big ones do, and a fridge is a slow place. Thin fish fillets and loose shrimp are the exception, since they have almost no middle to speak of, and those will be ready in a working day.
2. Cold water thawing (faster)
- Submerge food in sealed bag in cold water (below 70°F / 21°C)
- Change the water every 30 minutes
- Cook immediately after thawing
- Rule of thumb: ~30 minutes per pound (500 g)
3. Microwave thawing (fastest)
- Use the defrost setting (30% power)
- Cook immediately: some areas may begin cooking during defrost
- Rule of thumb: ~6–8 minutes per pound (500 g)
Never thaw at room temperature — the outer surface reaches the danger zone while the center is still frozen.
Defrost time reference by food:
| Food | Weight | Refrigerator | Cold Water |
|---|---|---|---|
| Chicken breast | 500 g / 1.1 lb | 24 hours | 33 min |
| Whole chicken | 2 kg / 4.4 lb | 24 hours 15 min | 2 hours 12 min |
| Ground beef | 500 g / 1.1 lb | 24 hours | 33 min |
| Steak (thick) | 500 g / 1.1 lb | 24 hours | 40 min |
| Fish fillet | 250 g / 0.55 lb | 8 hours | 10 min |
| Pork chop | 500 g / 1.1 lb | 24 hours | 40 min |
| Shrimp | 500 g / 1.1 lb | 8 hours | 20 min |
Whole birds are where the fridge method stops being convenient and starts needing a calendar. A 20 lb turkey wants four and a half days, which means it comes out of the freezer on the Saturday before Thanksgiving, not the Wednesday.
Safe internal temperatures after cooking:
- Poultry: 165°F / 74°C
- Ground meat: 160°F / 71°C
- Whole beef/pork/lamb: 145°F / 63°C
- Fish: 145°F / 63°C
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This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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