The heat capacities of powdered Ba 2 TiSi 2 O 8 and Sr 2 TiSi 2 O 8 have been measured over the temperature range from (2 to 300)K using a Quantum Design Physical Property Measurement System (PPMS). These two compounds have similar heat capacity values over the experimental temperature range because of their analogous structures. However, the heat capacities do display a crossover at T=112.6K, below which the heat capacity of Ba 2 TiSi 2 O 8 becomes larger than that of Sr 2 TiSi 2 O 8 . The experimental data have been fitted to a series of theoretical functions from which the thermodynamic functions have been calculated. The standard molar entropies at T=298.15K have been determined to be (254.67±2.55) and (252.61±2.78)J·K −1 ·mol −1 for Ba 2 TiSi 2 O 8 and Sr 2 TiSi 2 O 8 , respectively.