How Do I Add More Calories To My Diet Without Gaining Weight?

I have been dieting for 6 weeks now. I have lost 16 pounds so far. About 26 more to go, so i’m figuring about 3 more months then. But my question is, that once I reach my goal, how do I add calories back into my diet, so that I can stop losing weight & balance my diet back out, but at the same time, not gain weight either?