In a Jumbo Jack With Cheese ( 260 G ) there are about 620 calories out of which 351 calories come from fat. The total fat content of 260 G Jumbo Jack With Cheese is 39 g. Within the fat content, a Jumbo Jack With Cheese contains 15 g of saturated fat, 1.5 g of trans fat, 0 g of polyunsaturated fat and 1.5 g of monounsaturated fat.