Why cooking sprays have any calories?

Cooking sprays have calories because they contain oil, which is a calorie-dense substance. Vegetable oils, such as canola, olive, and soybean oils, are commonly used in cooking sprays and contain about 120 calories per tablespoon. Since cooking sprays are typically used to coat pans or add a light mist of oil to food, the amount of oil used per serving is typically small and the calorie count is relatively low. For example, a serving size of one spray of cooking oil contains about 5 calories. However, it is important to be mindful of the amount of cooking spray you use, as the calories can add up quickly if you use excessive amounts.