The amount of calories you burn on a daily basis is extremely complex and can be influenced by several factors. Your basal metabolic rate is the number of calories that your body burns at rest and to keep your organs working.
I will show you a calculator to get a rough idea of your current basal metabolic rate
If you try to increase your caloric intake by > 500 calories a day, you may begin to struggle with consistency. Your body, and most of all your stomach, will need some time to get used to the extra calories.