1.establish by counting or calculation; calculate."his debts were reckoned at $300,000"synonyms:calculate, compute, peg, work out, put a figure on, figure; More2.informalconclude after calculation; be of the opinion."he reckons that the army should pull out entirely"synonyms:believe, think, be of the opinion/view, be convinced, dare say, imagine, guess, suppose, consider, figure"I reckon I can manage that"