How-to
Learn how to defrost in a microwave: the defrost setting, steps for meat, timing, even thawing and the safety rules for cooking right after.
The defrost button is not a weaker version of full power, it is a stop-and-start cycle, and that detail explains almost every tip about thawing food in a microwave. Pulsing lets heat spread inward instead of cooking the edges while the middle stays frozen. Get the setting, the pauses and the timing right, and dinner goes from freezer to pan in minutes.
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Defrost works by cycling the magnetron on and off, so the oven averages roughly a fifth to a third of full power. That gives the ice time to melt and the warmth time to travel inward without cooking the outer layer. Larger, denser items need that gentle pace the most.
If your oven has no defrost button, set the power level manually to about 20 to 30 percent. For models with defrost by weight or time and adjustable power levels, see the 900 watt microwave comparison.
Chicken, beef, pork and fish all follow the same routine. The pauses are what keep the edges from turning rubbery.
Time depends on weight, thickness and density, so a single number cannot fit every oven. Published charts for meat run from roughly 6 to 10 minutes per pound, and fish and vegetables take less. Treat any chart as a starting point and check often.
The manual for your own oven is the best guide to the right power level and timing, and a weight setting does the arithmetic for you. Stopping to stir or flip adds a little to the total, because the oven needs a moment to get going again, but it prevents cooked edges.
A few small habits change the result more than the clock does. Metal pans and foil can reflect microwaves, which is the problem behind using metal microwave sparking, so glass or ceramic is the safer container.
Small pieces such as frozen vegetables thaw quickly, and many people run them at a lower power than meat. Frozen produce can also be cooked straight from the freezer, so defrosting is only worth it when the recipe needs it.
Thawed produce releases water, which can leave it limp, so move it to the stovetop soon after. Cooked leftovers need less time than raw food, so start with short bursts and check them often.
Uneven thawing can bring parts of the food into the temperature range where bacteria grow quickly, which is why defrosted food should not sit around. Cook it as soon as it comes out, as the last step above says.
Because microwaves heat unevenly, check the temperature in several spots when you finish cooking instead of trusting a single reading.
It should feel soft and pliable all the way through with no icy or cold pockets. If the edges look cooked while the center is still frozen, let it rest briefly, then continue in short bursts at a lower power.
Raw food thawed in the microwave should be cooked right away, not put back in the freezer. Once it has been fully cooked, leftovers can be cooled and frozen again, though quality drops with each thaw.