Translation guide
The English word 'logical' describes something that follows clear reasoning, makes sense, or is consistent. In Japanese, there is no single perfect equivalent; the best choice depends on whether you mean a person, argument, conclusion, or action.
Describing a conclusion, decision, or action that is sensible and well-founded.
The most direct translation for 'logical' in the sense of following logic or reason. Used for arguments, thinking, or conclusions.
彼の説明はとても論理的だ。
His explanation is very logical.
Literally 'the line of reasoning goes through', meaning something is coherent and makes sense. Common in everyday speech.
君の言っていることは筋が通っている。
What you're saying is logical.
Means 'in accordance with reason'. Slightly formal, often used for decisions or actions that are reasonable.
その判断は理にかなっている。
That decision is logical.
Describing an argument, story, or system that is internally consistent.
Literally 'has no contradiction'. Used when something is logically consistent.
彼の話は矛盾がない。
His story is logical (consistent).
A formal expression meaning 'consistent from beginning to end'. Used in writing or formal speech.
彼の主張は首尾一貫している。
His argument is logical (consistent).
Describing a person who thinks and acts based on reason.
A straightforward way to say 'a logical person'.
彼女はとても論理的な人だ。
She is a very logical person.
Means 'argumentative' or 'tending to rely on logic too much'. Can be slightly negative, implying someone is overly rational.
Can sound critical; use with care.
彼は理屈っぽいから、話が長くなる。
He's so logical that conversations get long.
Describing something that is the expected or inevitable outcome.
Means 'natural result' or 'logical consequence'. Used when an outcome is expected given the circumstances.
努力しなかったのだから、失敗は当然の結果だ。
Since he didn't try, failure is the logical result.
More formal, meaning 'inevitable result'. Emphasizes that the outcome could not be avoided.
それは必然的な結果だった。
That was the logical (inevitable) outcome.
While 論理的 is the direct translation, it can sound stiff in casual conversation. For everyday 'that makes sense', use 筋が通っている or なるほど (I see).
論理的 is neutral or positive (logical), while 理屈っぽい often implies someone is overly argumentative or nitpicky. Be careful with the nuance.