Understanding how many calories you need per day is tricky. NIH is here to help.
The National Institute of Diabetes and Digestive and Kidney Diseases has an easy-to-use, online body weight planner.
Enter basic information—like your height, weight, and physical activity level. Then answer questions about your goal weight and desired changes in physical activity.
The planner tells you how many calories you should eat per day in order to meet your goal weight—and maintain it.