The program "Calculation of roofs" is a calculator, created to help builders-roofer. This program has the following functions: - calculation of a sloperoof - calculation of a gable roof - calculation of the mansard roof - calculation of the hip roof - calculation of the roof area - calculation of the roof angle - calculation of the length of the rafters - calculation of rows of rafters with allowance for the gable and overhangs - calculation of rafter step - calculation of the number of rafters taking into account the set length of the edging board - calculation of the battens taking into account all overhangs and rows of rafters - calculation of the rows of the crate - calculation of the number of the battens taking into account the set length of the edging board - calculation of roofing material with graphic information - installation instructions - graphic representation of the future roof. - Save the result to a pdf file with convenient storage and viewing.   The functional of the program is designed for four types of roofs: slope, gable, mansard and hip, in the process will be added and other types of roofs. If necessary, all the necessary information will be added ON THE DESIRE OF USERS, ANY CALCULATION FUNCTIONS AND INFORMATION WILL BE INCLUDED IN THE PROGRAM!