For a large mirror start around 12 inches a standard ruler and adjust from there.
How to hang a mirror on a wall with wire.
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.
Hold the d rings over the pilot holes and secure them with small screws.
Place a scrap piece of wood that is approximately half as long as the mirror is wide underneath the hanging wire on back of the frame.
This requires attaching d rings to the back perimeter of the mirror frame wrapping wire around the d ring and then attaching one or two hooks to the wall and hanging the mirror by the wire.
Place the level against the wall at the place you want to hang the mirror and make a line on the wall with a pencil all along the top of where the mirror top will be.
Use a tape measure to measure the distance from the top of the mirror to the top of the piece of wood.
Repeat for both spots where the wire connects with a d ring.
Set the mirror down.
Mark the location of the top edge and the center of the frame.
Then place marks to the left and right of this mark a distance that is equal to 1 4 of the total distance between the d rings.
With the mirror propped against the wall or lying face down raise the wire up to make it taut and identify two points that will distribute the pressure equally across the wire.
Cut four medium length lengths of wire.
Hang a mirror using hooks step 1 hold the mirror in place close to eye level.
Cut a piece of picture hanging wire with wire clippers that is twice that.
Center it under the top of the mirror and hold it up tight under the wire until the wire is taut.
Hold the mirror against the wall at the desired position.
Measure the width of your mirror and mark a point in the middle of that line.
D rings and picture wire the mirror must have a frame around it to hang a mirror this way.
Then transfer that measurement to your markings on the wall so you know where to put the hanger.
Measure the width of the mirror and add 6 inches.
Take a small piece of wood approximately 12 inches 30 cm long and mark its center.
Wrap a length of scrap wire tightly around the hanging wire several times and crimping it closed with pliers securing it to one of the screw eyes.
Mark the wall near the center of the top edge with a pencil or painter s tape.