The invention concerns a process for the preparation of the calcium complex of 10-(2,3-Dihydroxy-l-(hydroxymethyl)propyl)-l,4,7,10-tetraazacyclodecane-1,4,7-triacetic acid, also known as Calcobutrol, starting from the pure gadolinium complex (Gadobutrol). The invention furthermore concerns Calcobutrol with a hitherto unknown level of purity.