How many calories should I eat to lose weight?

I am 23 years old and I weigh 124 lbs. I am 5 feet and 4 inches tall and female. I would like to lose 5 lbs. I exercise 20 minutes a day doing cardio, planks, squats, weight lifting. I have lost 6lbs in the past two months by eating between 1200-1600 calories. How many calories should I eat the lose the next 5 lbs?