The invention relates to a calendar/paperweight of the type that comprises a support including two metal rules which are provided on the base of the support on either side of the central line along which the base is folded. The aforementioned rules are positioned symmetrically along the lower edges of the side walls of the support, so as not to interfere with the constituent sheets of the calendar. The tubular support is made from cardboard and takes the form of an isosceles triangle that can be folded. The upper edge of the support is provided with a cord or spiral for connecting a plurality of sheets which include respective blank squares corresponding to the different days of the different months of the year for annotations which can be written on the calendar owing to the increased weight and stability of same. The sheets can be lowered indiscriminately onto both the front face and the rear face of the support. The invention is characterised in that it includes metal rules which are fixed to the support and which can be made from steel, any other material or a combination of heavy materials, including injected plastic, such as to increase the weight of the calendar considerably and, consequently, to improve the stability thereof.