noun which may take the genitive case particle 'no'
not factored in; unaccounted for; unplanned for
Describes something that was not included in a plan, calculation, or expectation. Often used with ～の or as a noun.
交通費は計算外の出費だった。
The transportation cost was an unplanned expense.
彼の反応は計算外だった。
His reaction was unexpected.