Check the microwave’s label on the back, side, door frame, or inside the door
Look for “Output Power,” “Cooking Power,” or “Watts”
Read the owner’s manual or product specifications
Search the model number online with “watts” or “power output”
Use the wattage listed on the manufacturer’s website
If only input power is listed, use that number only as electrical consumption, not cooking power
If the label is missing, contact the manufacturer with the model number
Use a microwave wattage tester if you need an exact measurement