This means your hard work was worth it. You got a good result because of what you did.
Verb [た-form] + 甲斐がある / 甲斐があったPrimary
Noun + の + かいがある
Verb [stem] + がいがある
This means your hard work was worth it. You got a good result because of what you did.
遠くまで来たかいがあり、素晴らしい景色を見ることができました。
It was worth coming all this way; we were able to see a magnificent view.
あんなに頑張ったのに試験に落ちて、努力したかいがなかった。
Even though I tried so hard, I failed the exam, so my efforts were not worth it.
これは何時間も並んで待ったかいがある、限定のケーキだね。
This is a limited-edition cake that was worth waiting in line for hours.
毎日ジョギングを続けているかいがあって、最近体調がとてもいい。
It's been worth continuing my daily jogging; my physical condition has been great recently.
料理を勉強したかいがあって、恋人が「美味しい」と喜んでくれた。
It was worth studying how to cook, as my partner was delighted and said it was delicious.
This phrase shows that your hard work paid off. It means you feel good about what you did. It is like finding a treasure after a long search.
The opposite is "kai mo naku" or "kai ga nai". This means your effort did not help. For example, "We lost the game even with our best effort." "Kai ga aru" is about your personal feeling of reward. "Dake no koto wa aru" is about something being good, as expected. For example, "It is expensive, but it is good, as expected."
Don't use this when talking about simple, everyday things. For example, don't say "It was worth waking up this morning" if it was just a normal day.
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