Question: how many calories in a impossible whopper without mayo?
Answer: The Impossible Whopper comes in at 630 calories (again, half from fat), 34 grams of fat, and 25 grams of protein. The Impossible Whopper does have significantly lower cholesterol — 10 milligrams compared to 90 milligrams — but has more sodium at 1,240 milligrams compared to 980 milligrams.