Abstract Blocking temperature (θ B ) holds utmost significance in magnetic devices. A novel approach to ascertain the θ B for bulk materials has been propounded. The θ B has been correlated with the magnetic entropy change (ΔS) during zero-field cooled (ZFC) and field cooled (FC) magnetization. The values of ΔS have been calculated in µ B /f.u.K. The θ B has been investigated for two distinct cases – (I) with ZFC magnetization reversal and (II) without ZFC magnetisation reversal. Based on the reported experimental approach, a novel definition of θ B has been propounded for bulk materials. The combined analysis of ZFC and FC magnetization behaviour provides a better approximation of θ B for bulk materials.