In summary, we have employed state-of-the-art DFT and wavefunction-based multi-reference methods to investigate doublet-quartet energy gaps of the recently synthesized Blatter's based triradical namely, The standard DFT based broken symmetry method with hybrid B3LYP functional yields exaggerated values in disaccordance with the experimentally reported values from EPR and SQUID techniques. The CBS-DFT improved them providing proximate results to experiments. Since both these methods are limited by large spin-contamination of the low-spin state, wavefunction-based SA-CASSCF/NEVPT2 methods including both static and dynamical correlations comes out as a method of choice for computing accurate energy gaps in the reported triradical. However, special care needs to be taken to choose roots to be included in state-averaging procedure such that they arise from different spin-couplings of localized electrons. Further, upon validation of the computational scheme, we have investigated the energy gaps for three modeled Blatter's based triradicals viz. Bl-Bl-NN(B), Bl-Bl-NN(C) and Bl-Bl-Bl. All of them have been shown to have quartet as ground state with significant ∆E D1,Q and ∆E D2,Q values. The molecules Bl-Bl-NN(B) and Bl-Bl-Bl exhibit even larger energy gaps than the experimentally synthesized triradical. Thus, they present themselves as possible alternative organic molecules with magnetically robust quartet ground-state. We believe that this work paves way to synthesizing further triradicals with large doublet-quartet energy gaps and promising applications in organic magnetic and electronic materials.