What it means
だけのことはある expresses an evaluation that matches the expected result of a preceding fact or quality. It means that the result is unsurprising or that something lives up to the reputation, effort, ability, or cost associated with it. The construction usually follows a past-tense verb, an i-adjective, a na-adjective followed by な, or a noun. It commonly refers to an observed result, so it is more than a simple statement of the preceding fact.
Usage note
だけのことはある often evaluates a result that is stated in the surrounding context or understood from the situation. With a noun or na-adjective, retain な before だけのことはある; this differs from patterns that attach directly to a noun or na-adjective without な.
How to use it
彼は専門家だけのことはあります。複雑な問題もすぐに解決しました。
He is an expert for good reason. He solved even a complicated problem immediately.
彼の説明は簡潔なだけのことはあります。要点がすぐに分かります。
His explanation is concise for good reason. Its main points are immediately clear.
この靴は高いだけのことはあります。履き心地がとてもよく、長く使えます。
These shoes are expensive for good reason. They are very comfortable to wear and can be used for a long time.
彼は毎日練習しただけのことはあります。難しい曲も正確に演奏できます。
He practiced every day for good reason. He can perform even difficult pieces accurately.
彼は専門家だけのことはある。複雑な問題もすぐに解決した。
He is an expert for good reason. He solved even a complicated problem immediately.
彼の説明は簡潔なだけのことはある。要点がすぐに分かる。
His explanation is concise for good reason. Its main points are immediately clear.
この靴は高いだけのことはある。履き心地がとてもよく、長く使える。
These shoes are expensive for good reason. They are very comfortable to wear and can be used for a long time.
彼は毎日練習しただけのことはある。難しい曲も正確に演奏できる。
He practiced every day for good reason. He can perform even difficult pieces accurately.