The selection of safe and economical types of reinforced concrete foundation is one of thernchallenges for professionals in current designing practice, and this issue is more complex forrnfoundation design for different buildings that are intended to be constructed on expansive soils ofrnAddis Ababa. Beside the concern of swelling pressure of expansive soils, the availability of precisernfoundation software, cost of construction, and variability of foundation design factors withrnuniqueness of the project are also among the factors that brought extra challenges onrnprofessionals to select the safest and economical foundation in different localities of Addis Ababa.rnIn this research work, an attempt is made to develop a simple software using Programmingrnlanguage, MATLAB 2011, and visual basic ultimate studio 2015 for handling the above issues byrnapplying seven main reinforced concrete foundations such as footing foundations, slabrnfoundations such as slab-on-ground, uniform mat and ribbed mat foundations, straight bored pile,rnsingle and double-under-reamed pile foundation for different buildings ranging from one story tornsixteen stories under four grouping. The expected input for this software are superstructure loads,rnswelling pressure, allowable/safe bearing capacity (based on UCS values and N-values from SPTrnreadings), depth of moisture fluctuation and foundation determining factors like aspect ratio forrndimensional factor and aspect ratio of load factor.rnWith this research, it is believed that a considerable time would be saved in geotechnicalrninvestigation. A suitable guideline for the selection of safe and economical types of reinforcedrnconcrete foundation for different buildings constructed on expansive soil of Addis Ababa isrnproposed