〜ほど (extent)
so … that, to the point of; about
Plain form + ほど · Number + ほど
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ほど measures how far something goes by comparing it to an extreme: 泣きたいほど悲しかった, "I was so sad I wanted to cry". 死ぬほど疲れた, "I'm dead tired", is an everyday exaggeration.
The ほど part is the benchmark, often a verb in the plain form (or its negative): 立っていられないほど, "to the point I can't stand".
After a number, ほど means "about", a little more formal than ぐらい: 駅まで十分ほどかかります, "it takes about ten minutes to the station".
くらい and ぐらい can replace ほど in the "so … that" use. ほど is slightly more formal, and it's the one used for "not as … as" (N4) and "the more … the more".
Examples
泣きたいほど悲しかった。
I was so sad I wanted to cry.
死ぬほど疲れた。
I'm dead tired.
数え切れないほど星が見えた。
There were more stars than I could count.
駅まで十分ほどかかります。
It takes about ten minutes to the station.
立っていられないほど、足が痛い。
My feet hurt so much I can't stand.