Fill in the blue Mass and Heat capacity (Cp) input boxes and choose convenient units from the unit menus. When you fill in either the temperature change or energy change, the calc will give the associated energy or temperature change in the right orange box.
Remember that Cp is temperature and phase-dependant. Typical heat capacities (in J/K⋅g) include: air (1.0035), water (2.08), glass (0.84), iron (0.45), copper (0.385), hydrogen (14.3).