The Oxford Thesaurus An A-Z Dictionary of Synonyms - calculationn.

1) computation, reckoning, counting, estimation, figuring, determining: We needn't number them one by one, for the total can be arrived at by calculation. 2) answer, product, result, figure, count, estimate, amount: This calculation is wrong, so please do it again. 3) estimate, forecast, expectation, prediction, deliberation; circumspection, cautiousness, wariness, caution, prudence, forethought, discretion: His attack was not the inspiration of courage but the result of calculation.