The primary signal measured by a microcalorimeter is a heat power; that is the rate of production of the heat evolved during a reaction. As such, this primary signal is directly linked to the kinetics of the reaction. kinITC has been developed to recover this kinetic information from the shape of each injection curve in a classical ITC experiment. It will be shown how the true kinetic signal is affected by the response time of the instrument. In situations where the reaction (i) is not too rapid and (ii) follows a one-step mechanism, the kinetic parameters kon and koff can be recovered immediately after the regular treatment yielding the △H and the KD of the reaction. This has been implemented in the software AFFINIMeter.