Based on the definitions of verse, rhythm and rhyme and the sonnet’s features in both English and Spanish lyrical poetry, this study formally analyzes the meter of a corpus consisting of eleven translations of Shakespeare’s Sonnets (1609) into Spanish, all of them published in Spain between 1990 and 2013. For this analysis we have paid attention to three essential aspects: verse length, stressed syllables pattern and the type of rhyme used by the translator. This has been made in order to observe the rhythm and rhyme treatment in them and draw some conclusions about the degree of formal similarity between the translation and the source text. This degree of similarity has been established from a gradual list of potential correspondences in Spanish for the iambic pentameter used by Shakespeare in his poems.