The Entropy Change Calculator helps you determine the change in entropy (ΔS) of a system using the formula ΔS = q / T, where q is the amount of heat transferred and T is the absolute temperature in Kelvin. This tool is useful in thermodynamics to understand how energy disperses within a system. Simply enter the heat (q) and temperature (T), and the calculator instantly provides the entropy change in joules per kelvin (J·K⁻¹). Remember, for accurate results, the heat value should represent reversible heat transfer (q₍rev₎) and the temperature must be above 0 K.