How to know about the required size of your curtains?

The proper covering of your window depends upon the accurate size of your curtains. Simply take a measuring tape to know about it. First of all, measure the width of your window and keep it double for your curtain. Secondly, measure the length of your window. initiate it from the starting point of the window till the floor or above the floor, it depends upon your level of liking. You must consider the length of your curtain more than the original to remain away from the troubles. How are you taking the size of your curtains?