With the increasing environmental issues and the need to have more sustainable solutions in the construction industry and the built environment, raising awareness regarding more use of timber in multi-story structures is aimed. Ensuring the performance of timber balconies will help to increase more use of timber as the construction material in these elements. The developed tool in this study has two versions. The first one is able to calculate and control the deflection of balconies built with cross-laminated timber (CLT) panels. The second version calculates and controls the deflection and vibration of balconies made with plywood and timber studs. The material properties in the second version are verified with experimental tests performed on 30 balcony slabs. The four-point bending test and natural frequency measurements were performed at RISE laboratories. The tool is designed in Excel and has the advantages of being easy to access, easy to use, and easy to understand for the user.