I think I would use "in". I would also consider changing "calculate" to "express".
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asaisaioThanks for your answer. I was wondering if this pattern, "I do sth. using sth." is correct? or adding a "by" before "using"? Thanks in advance!Both are in common use. I think "by" is usually redundant though. At least, I can't think of any example where it is necessary.
asaisaioHowever, I can't find any example that uses "using" alone.Google search will furnish you with as many examples as you require.