The results section is structured as follows. First, 4 unique Ca sites are identified. The sites are identified by their local environment which stems from their location in the C-S-H nanofoil. This local environment is defined by the Ca connectivity, such as the coordination number and oxygen type, which consequently impacts the symmetry of the nuclei and therefore the broadness of the Ca NMR shift. According to the DFT predicted chemical shifts of the model C-S-H structures a distinct chemical shift is assigned to each of the 4 unique Ca sites in C-S-H. Then, existing experimental measurements of different C-S-H structures are used to build C-S-H nanofoil models. For these nanofoil models the proportion of the individual Ca sites is then calculated and used to predict Ca NMR spectra of C-S-H. Finally, Ca NMR spectra for different C 3 S hydration rates are predicted and compared.