For general cardio, the average person will burn about 320 calories in a 50 minute routine. This can vary if your cardio is lower or higher impact. A higher impact work-out will burn more than a lower impact work-out.
Due to variances in weight/height/total-fat percentage total calories burned will vary if your an average hight/weight male you will have burned 2761 kcal, search for calories-burned-calculator for more accurate results