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This paper presents the thermophysical properties of the 1-butyl-3-methylimidazolium–based ionic liquids (ILs) with different oxidative anions such as hexafluorophosphate and tetrafluoroborate. Differential scanning calorimetry (DSC), thermogravimetric, and rheology studies were carried out for the properties’ measurement. Heating and cooling rates of 1°C/min, 3°C/min, and 5°C/min were used for the DSC analysis. The specific heat capacity of the ILs was measured in the temperature range of −40 to 40°C. The experimental result shows that the specific heat increases with increasing the temperature and the viscosity decreases with increasing the temperature. From the thermogravimetric analysis, the onset temperature of the [BF4] tetrafluoroborate and [PF6] hexafluorophosphate was 362°C and 381°C. Dynamic viscosities of the ILs samples diminished exponentially with an increase in temperature. The density of the ILs samples diminished exponentially with the rising temperature. The electrical conductivity of tetrafluoroborate has the highest electrical conductivity compared to the hexafluorophosphate.