Microwave Wattage Converter

Convert Microwave Cooking Times Between Wattages

Packaged microwave meals list a cook time for a specific wattage, often 1000 W or 1100 W. If your microwave runs at a different power level, the label time may overcook or undercook the food. A microwave wattage converter matches the energy delivered by scaling the cook time to your appliance.

How Microwave Time Conversion Works

Microwaves heat food by transferring energy over time. The same energy can be delivered with lower wattage over a longer period or with higher wattage over a shorter period. The conversion formula is:

Your time = (Label time × Label wattage) ÷ Your wattage

For example, if a package says 5 minutes at 1000 W and your microwave is 800 W, the adjusted time is (300 seconds × 1000) ÷ 800 = 375 seconds, or 6 minutes 15 seconds.

When to Use a Lower Power Setting

Higher wattage is not always better. Dense foods, large portions, and meat dishes often cook more evenly at reduced power with longer time. If your microwave is much stronger than the label wattage, consider lowering the power level and using the converted time for more even heating.

Pair this tool with the Lighting Calculator when comparing appliance power usage around the home.