We all need a different amount of calories, based on age, current weight and height.
In order to lose weight, you need your calorie intake to be less than your total daily calories burned. You can use calorie calculator to estimate the calories you need to consume each day. The best way to lose weight is through proper diet and exercise. Try not to lower your calorie intake by more than 1,000 calories per day, and try to lower your calorie intake gradually.
Basic for losing weight is "burn more calories than you take" and how much calories you should take in depends on your age, weight, height and work like you are doing desk job or something else. The best way to do this is consult an expert/physician. He/she will guide you and make sure that you safely reach your weight management goals