Add-in (plug-in) for MS Word which makes easier the work with chemical and mathematical formulas and with chemical equations. For the set of chemical elements (Li, Ba, Ca and so on) there is a function enabling to print capital and small letters without switching by "Shift" and "Caps Lock" keys. Figures specifying the number of atoms in chemical formula (H3PO4) are automatically made subscripts, and atom's oxidation figures and ion charges - superscripts. At rearrangement of chemical equation "=" sign can be substituted by an arrow. It is possible to insert arrows with frequent reaction conditions or to form your own ones, it also possible to add additional information ((s), (l), (g) and so on) which can be edited. There is a function of checking chemical equation in relation to the number of elements from the right and from the left. Functions for the work with mathematical formulas enable to rearrange mathematical formula of one line into the formula with full numerators, denominators, radicals and degrees by using single keystroke.