Measure for eyelet curtains quick tips
Fit your curtain pole at least 3 inches over the top of your window. Assuming there is room over the window recess, it justl looks better. You won't then see the window frame through the eyelet holes. I usually fit my curtain pole at least 3 or 4 inches over the top of the window. You can fit the pole higher for a more dramatic effect. Especially in rooms with high ceilings.
This allows the eyelet rings to sit over the wall so is not seen from outside. I think it just looks that much better.
The curtain pole width should be the width of your window, plus at least 5 or 6 inches past both sides. This allows your curtain to pull back of the window letting lots of light into the room.
Occasionally I make the curtain track an inch or two wider if your curtains are made of thick fabric or have a thick blackout lining.
To work out how wide each curtain panel should be (assuming a pair). You need to allow for both flat panels to be a minimum of one and a half times the curtain pole width. I personally think they look much better at double the pole width.
Give or take a couple of inches. This allows the curtains to have enough fabric to allow the pleats to look right when hanging over your window. However when having your eyelet curtains made to measure. I think closer to two times the width of the pole looks even better.
To work out the length (drop) for your new eyelet curtains. you will need to hold the tape measure at the top edge of the curtain pole.
Then measure down to where you want the eyelet curtains to finish. That will be either to just at the window sill or a few inches past the window sill. Alternatively down to the floor my personal favourite.