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1 When baking more than one potato, choose potatoes that are the same size, so they finish baking at the same time.  Preheat the oven (see table below). You can bake your potatoes at different temperatures, ranging from 400 degrees Fahrenheit (204.4 degrees Celsius) to 325 degrees Fahrenheit (162.7 degrees Celsius).
Space the potatoes on a rack in the preheated oven so there is at least an inch of space around each potato. In a standard oven you should be able to have three rows with five potatoes in each row. Bake the potatoes for about 50 minutes. Use an oven mitt to remove one potato to test it. The potato is done if it feels soft and has a tender feel when you pierce it with a fork. If the potato is not done, put it back in and cook an additional 10 minutes.