When expressing assumptions or approximations, the phrase "estimated at" comes in handy. However, using the same phrase repeatedly may lead to a monotonous piece of writing. Therefore, it is crucial to have a vast vocabulary of synonyms to add life to your text. Some of the possible synonyms for "estimated at" include "assessed," "approximated," "calculated," "conjectured," "evaluated," "guessed," "inferred," "presumed," "projected," "speculated," and "surmised." These synonyms not only make the text more engaging, but they also provide slightly different meanings of the estimation. However, it is essential to consider the context of the text and choose the appropriate synonym that fits.