Notes: 1. This calculator is still in the development stage (Not a design tool yet). 2. While it was validated against fire tests in literature, its applicability to actual scenarios requires further testing. 3. Please feel free to test this App and to send me your comments and suggestions. 4. In some instances, the App may give two answers for a certain combination of factors. A conservative estimate is to go with the more severe case. 5. Be cognizant of a few bugs. This work is based on the following publications: Naser M.Z., Salehi, H. (2020). “Machine Learning-Driven Assessment of Fire-Induced Concrete Spalling of Columns.” ACI Materials Journal. https://doi.org/10.14359/51728120. Naser M.Z. (2021). “Observational Analysis of Fire-induced Spalling through Data Science and Machine Learning.” ASCE Journal of Materials in Civil Engineering. https://doi.org/10.1061/(ASCE)MT.1943-5533.0003525. Seitllari A., Naser M.Z. (2019). “Leveraging Artificial Intelligence to Predict Fire-induced Explosive Spalling in Concrete.” Computers and Concrete. Vol. 24, https://doi.org/10.12989/cac.2019.24.3.271 Naser M.Z. (2019). “Heuristic machine cognition to predict fire-induced spalling and fire resistance of concrete structures.” Automation in Construction. Vol. 106, 102916. https://doi.org/10.1016/j.autcon.2019.102916. Naser M.Z., Seitllari A. (2019). “Concrete under fire: an assessment through intelligent pattern recognition.” Engineering with Computers.  pp. 1-14. https://doi.org/10.1007/s00366-019-00805-1