計算違(けいさんちが)い

けいさんちがい
noun
miscalculation; error in judgment
cognition
1. miscalculation; arithmetic error
A mistake in a mathematical calculation or numerical computation.
計算違(けいさんちが)いがあった。
There was a miscalculation.
見積(みつも)りに計算違(けいさんちが)いがないか確認(かくにん)した。
I checked the estimate for calculation errors.
予算(よさん)に計算違(けいさんちが)いがあり、費用(ひよう)が大幅(おおはば)に超過(ちょうか)した。
There was a miscalculation in the budget, and costs significantly exceeded the plan.
2. misjudgment; wrong estimate; things not going as planned
A figurative miscalculation — when a plan, prediction, or expectation turns out to be wrong.
それは計算違(けいさんちが)いだった。
That was a misjudgment.
相手(あいて)を甘(あま)く見(み)たのが計算違(けいさんちが)いだった。
Underestimating the opponent was a miscalculation.
計画(けいかく)は順調(じゅんちょう)だったが、天候(てんこう)の変化(へんか)が計算違(けいさんちが)いだった。
The plan was going well, but the change in weather was something I hadn't accounted for.

Composed of 計算(けいさん) (calculation) + 違(ちが)い (difference/mistake). The figurative sense (misjudgment, things not going as planned) is more common in everyday conversation than the literal arithmetic sense.

Common patterns

  • 計算違(けいさんちが)いだった: it was a miscalculation
  • 計算違(けいさんちが)いがあった: there was a miscalculation
  • 〜が計算違(けいさんちが)いだった: ~ was something I hadn't accounted for

Usage

Often used when someone's plan fails because they underestimated something or didn't anticipate a factor. The tone implies a mistake in judgment rather than a simple arithmetic error.

Similar words

Related Words

Compare: 誤算(ごさん) (miscalculation, misjudgment)
Compare: 見込(みこ)み違(ちが)い (wrong estimate, misjudgment)
general
Added 2026.3.25 10:40 · Revised 2026.9.2 13:01
19000/19241_keisanchigai