Datasets list all propellants, and their corresponding propulsion system, mission design, and performance values, considered in the open-access research paper: J. Martinez Martinez and T. Lafleur, "On the selection of propellants for cold/warm gas propulsion systems", Acta Astronautica 212, 54 (2023). In each of the four files, propellants are ranked according to a specific performance metric: Propellant_Ranking_FP.xlsx = Thrust-to-power ratio Propellant_Ranking_Isp.xlsx = Specific impulse (impulse per propellant mass) Propellant_Ranking_Ivol.xlsx = Volumetric impulse (impulse per propellant volume) Propellant_Ranking_Ispstar.xlsx = Effective specific impulse (impulse per propulsion system wet mass; defined in the above paper) Each column in the datasets is labelled and corresponds to a specific variable used in the performance model in the paper above. The last column "Comments (E = extended properties)", highlights whether additional extrapolation of any model input physical/thermodynamic data was required. That is to say, for each propellant considered, physical data (such as the viscosity) is needed and was obtained from existing chemical databases. Such databases typically perform a regression analysis and propose empirical equations for calculating physical/thermodynamic data at a given temperature. The regression coefficients are often only valid within a certain temperature range. The label "E" in the last column indicates that data for that propellant was required at a temperature outside of this validity range. In most cases, the temperature is only just outside the validity range for some properties, and the empirical equation is still used within the model, but the label "E" has been used to signal to the reader that an extension of some empirical equations was needed.