Calories Burned. The number of calories burned with mountain climbers varies slightly, depending on several factors. In general, doing three sets of 15 to 20 repetitions burns about 50 calories, according to Gold's Gym.However, this is only an estimate.alories Burned. The number of calories burned with mountain climbers varies slightly, depending on several factors. In general, doing three sets of 15 to 20 repetitions burns about 50 calories, according to Gold's Gym.