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In ferromagnetic semiconductors, the coupling of magnetic ordering with semiconductor character accelerates the quantum computing. The structural stability, Curie temperature (T_c), spin polarization, half magnetic ferromagnetism and transport properties of ZnX₂Se₄ (X = Ti, V, Cr) chalcogenides for spintronic and thermoelectric applications are studied here by density functional theory (DFT). The highest value of T_c is perceived for ZnCr₂Se₄. The band structures in both spin channels confirmed half metallic ferromagnetic behavior, which is approved by integer magnetic moments (2, 3, 4) μ_B of Ti, V and Cr based spinels. The HM behavior is further measured by computing crystal field energy <inline-formula><math display="inline"><semantics><mrow><mo>Δ</mo><mi>E</mi></mrow></semantics></math></inline-formula>_crystal, exchange energies <inline-formula><math display="inline"><semantics><mo>Δ</mo></semantics></math></inline-formula>_x(<i>d</i>), <inline-formula><math display="inline"><semantics><mo>Δ</mo></semantics></math></inline-formula>_x (<i>pd</i>) and exchange constants (N_o<inline-formula><math display="inline"><semantics><mi>α</mi></semantics></math></inline-formula> and N_o<inline-formula><math display="inline"><semantics><mi>β</mi></semantics></math></inline-formula>). The thermoelectric properties are addressed in terms of electrical conductivity, thermal conductivity, Seebeck coefficient and power factor in within a temperature range 0–400 K. The positive Seebeck coefficient shows p-type character and the PF is highest for ZnTi2Se4 (1.2 × 10¹¹ W/mK²) among studied compounds.