The dataset comprises output data from a Life Cycle Assessment (LCA) model focused on compostable nappies. It includes detailed information on various life cycle stages (manufacture, transport, use, collection, and disposal) and the environmental impact associated with each. The data is structured as CSV files, detailing material inputs, energy consumption, and resulting environmental outputs. The dataset facilitates the analysis of different end-of-life scenarios for compostable nappies, including landfill, incineration, and composting. Full details about this dataset can be found at https://doi.org/10.5285/dcb5904b-0e5a-4065-842a-b8ee8ec8554e