If you are 5 feet and 5 inches and weigh 200 lb then you need about 2450 calories every dayto maintain this weight. If you live a sedentary life where there is no room for activity (like having a 9-5 job), then your only means to lose weight is to cut down your daily calorie intake.
If you cut 500 calories every day then your daily intake would be 2000 calories/day, and this is an optimal intake to maintain a reasonable weight on the long run. The answer to the asked question is 500 calories/day, cut 500 calories every day to lose weight.
If you want to know How to cut 100 calories from your breakfast
and How to cut 100 calories from your lunch or dinner
Visit the above links