Study of concrete properties at high temperatures remained a focus of many researchers since years. In this research, the impact of heating on concrete specimens was studied while considering the toughness parameter, and then the outcomes were matched with the unheated concrete specimens. For this purpose, experimental data from previous studies was collected, analyzed and functions were proposed for various properties of concrete. The working was carried out on the after-peak portion of the stress-strain curves obtained from the compression testing of concrete specimens in a strain-controlled environment. The stress-strain curves were imported in AutoCAD and scaled as required. Several points were marked on the post-peak portion of each stress-strain curve and the values were imported in an excel spreadsheet.