〜くらい・〜ぐらい (at least, to the extent)
at least, even just; so … that; no one as … as
Noun / Plain form + くらい / ぐらい
Sign up free to review this point on a spaced schedule.
At N5, ぐらい meant "about" with numbers. It has more uses.
At least, even just: it plays something down as the minimum: 自分の部屋ぐらい自分で掃除しなさい, "at least clean your own room yourself". 電話くらいしてくれてもいいのに, "you could at least have called". It's often a complaint.
So … that: like ほど, it gives the extent: 声が出ないくらい驚いた, "I was so surprised I couldn't speak".
No one as … as: 彼くらい日本語が上手な人はいない, "no one speaks Japanese as well as he does".
くらい and ぐらい are interchangeable. Some speakers prefer くらい after これ, それ, あれ and どれ.
Examples
自分の部屋ぐらい自分で掃除しなさい。
At least clean your own room yourself.
電話くらいしてくれてもいいのに。
You could at least have called.
ひらがなぐらい読めるよ。
I can at least read hiragana.
声が出ないくらい驚いた。
I was so surprised I couldn't speak.
彼くらい日本語が上手な人はいない。
No one speaks Japanese as well as he does.