彼は勘定高いから、得にならない仕事は引き受けない。
He's so calculating that he won't take on any job that doesn't pay off for him.
勘定高い商人に言いくるめられて、高い品物を買わされた。
I was talked into buying something expensive by a mercenary merchant.
あの人は親切そうに見えて、実は勘定高い。
She seems kind, but she's actually quite calculating.