Overall score includes:

Cooking performance (70%)
Based on cooking broccoli, defrosting mince and a whole chicken, and reheating quiche. If models have a grill we also grill toast.

Ease of use (30%)
We check how easy it is to use the controls, see through the door during cooking and how easy the microwave is to clean.

Running costs ($/year)
Are calculated on reheating a plated meal once a day (with electricity costs at 26¢/kWh).

Price is from a June 2019 survey.