Once you have a good place, mark where the top of your mirror will go with a pencil or some painters tape so you’ll be able to measure for the hangers. You can also use those pencil marks and a level to make sure your mirror will be straight. If your mirror is too large to hold up easily and mark at the same time, measure it with some measuring tape or a yardstick, and see how those dimensions fit.
If you have a hanger wire, probably only on a smaller mirror, you will only need one hole. Measure the width of your mirror, and mark a point in the middle of that line. Take the wire in your picture, and hold it taut from the center to measure the distance from the top of wire to the frame. Then, transfer that measurement to your markings on the wall so you know where to put the hanger. If you have D-rings, they will be fastened to the mirror, and not move. Measure how far apart your fasteners are from one another, and how far they are from the top of the mirror. Once you have these distances, transfer them to the wall by measuring and marking from your earlier pencil line. [5] X Research source
Once you have a good place, mark where the top of your mirror will go with a pencil or some painters tape so you’ll be able to measure for the hangers. You can also use those pencil marks and a level to make sure your mirror will be straight. If your mirror is too large to hold up easily and mark at the same time, measure it with some measuring tape or a yardstick, and see how those dimensions fit.
Once you have them in, measure how far apart the cleats are from one another, and from the edges of the mirror.
If you are hanging the mirror onto a wall of brick or thick plaster, you’ll need larger screws and a stronger drill bit to get into the wall, and make sure it holds on. [11] X Research source
Once your glue dries, you won’t be able to readjust the mirror without damaging your walls (and possibly the mirror), so your measurements need to be exact. You only get one shot at this. [14] X Research source
