A woman should consume an average of 2,000 calories a day. Average calorie intake will change based on each individual woman's lifestyle, activity level, age and metabolic rate.
While a moderately active woman should consume about 2,000 calories a day, a sedentary woman should consume only 1,800 calories a day. If a woman is highly active, she should consume about 2,400 calories a day. As a woman ages, her metabolism will slow, meaning she should consume fewer calories a day to maintain her current weight. A pregnant woman should have 300 more calories when she begins her second trimester. While counting calories is important, maintaining a balanced diet filled with proteins, carbohydrates, fats, vitamins and minerals will help a woman maintain her ideal weight better than someone consuming 2,000 calories in junk food.