When will I know my final size after breast augmentation?

There is no fixed time where you will know the final size of your breasts after breast augmentation but usually we can say that inflammation may start to cease after one month and a half to three months post surgery, but remember every body is different so inflammation periods can vary from patient to patient.

By about 2 months if the implants settled, then you probably can get an idea of what you final size will be.  They probably will not change a huge amount at this point.