The types-tokens ratio (TTR), which is calculated by dividing the number of different word forms (types) in a text by the total number of the words (tokens), roughly characterizes the lexical variety of the text. This makes it intriguing to compare this parameter in the original texts and Sin translations from the theoretical and practical points of view. After analyzing our proper empiric material, four Spanish-Ukrainian translations and four Ukrainian-Spanish translations compared with their respective originals, along with the results of other researchers in different language combinations, it turned out that TTR modifications show common tendencies depending on the typological characteristics of the source language and target language, and the direction of translation, rather than the lexical variety of the text.