I love Sausage, Egg and Cheese Bagels from McDonald's, but clearly only as a special "treat". I figured the calorie count this way: According to Dotti's Wieght Loss Zone, a sausage, egg and cheese McGriddles is 560 calories and a bacon, egg and cheese McGriddles is 450 calories. So, the same sandwich with sausage is 110 calories more than with bacon. The bacon, egg and cheese bagel is listed as 590 calories, so I assume that the sausage, egg and cheese bagel is (590 + 110) 700 calories.

Sorry that is more than what other people had said.