The size of the mirror for a 60-inch vanity will depend on whether it is a single or double sink vanity. Here are some guidelines to consider:

• Single sink vanity: Assuming the sink is centered on the vanity, a nice free-hanging 36-inch diameter round mirror can be used, with 12 inches on either side for mounting sconces.

• Double sink vanity: For a double vanity, it is recommended to use a rectangular mirror that is four inches smaller than the width of the vanity. The mirror should be mounted 2 inches from the edge of the vanity on either side, leaving a 4-inch space between them. The height of the mirror can be calculated by adding the height of the vanity plus 12 inches, subtracting this from the height of the ceiling, and subtracting 8 inches from the vanitys width to calculate the mirrors width.

• General guideline: A good rule of thumb is to have the mirror a few inches shorter than the overall width of the countertop, whether it is a single or double sink vanity. For a 60-inch vanity, some sources recommend finding mirrors that are at least 60 inches wide, while others suggest mirrors that are 58-59 inches wide.

Remember to mount the center of the mirror at eye level, 57-60 inches from the finished floor.