Molar heat capacity of ammonium sulfamate (NH4SO3NH2) was measured in the temperature range from 8 K to 335 K by low-temperature vacuum adiabatic calorimetry. Obtained data were approximated by linear combination of Einstein functions. Heat content and entropy of NH4SO3NH2 were calculated from these data. Enthalpy of NH4SO3NH2 dissolution in water was determined at 298.15 K by means of solution calorimetry. On the basis of experimental data the standard entropy, enthalpy and Gibbs energy NH4SO3NH2 formation at 298.15 K were calculated. The phase transition of NH4SO3NH2 was observed by adiabatic calorimetry. (C) 2019 Elsevier Ltd.