When it comes to synonyms for the word "reckon", there are a variety of options to choose from. Some of the most common synonyms for "reckon" include "calculate", "estimate", "guess", "assume", "believe", "suppose", "judge", "deem", "evaluate", "consider", and "appraise". Each of these words carries a slightly different connotation and may be more appropriate in certain contexts. For example, "estimate" and "calculate" are often used when referring to mathematical or scientific calculations, while "judge" and "evaluate" may be used when assessing someone's performance or behavior. Ultimately, selecting the right synonym for "reckon" is important to convey the intended meaning of a sentence or phrase.