Is a 1200 watt microwave good?

Online Answer
In general, the higher the wattage, the faster and more evenly your food will cook. Larger, more expensive microwaves tend to have a higher wattage, so this is a price and size consideration that can strongly influence microwave cooking performance.
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Check the inside of the oven's door, on the serial number plate on the back of the oven, or in the owner's manual or the manufacturer's website for the wattage.
You can find microwaves that pack 600 watts of power output on the market, and as well as those go all the way up to 1250 watts. Microwave ovens that pack the power output of 600W to 900W are commonly considered low wattage microwaves.