how much; how many; to what extent
Used to ask about degree, quantity, or extent. Can be used as an adverb or noun.
どれほど時間がかかりますか。
How much time will it take?
no matter how much; however
Used in concessive patterns like どれほど...ても/でも to mean 'no matter how much' or 'however'.
どれほど頑張っても、彼には勝てない。
No matter how hard I try, I can't beat him.
(not) much; (not) many; hardly; barely
Used with どれほども and a negative verb to mean 'not much/many' or 'hardly any'. Often implies a small amount or almost none.
彼の気持ちがどれほどか、わかりますか。
Do you understand how much he feels?
However expensive it is, I want to buy it.
There is hardly any left.
どれほども歩かないうちに疲れた。
I got tired after walking barely any distance.
どれくらい is the everyday, neutral way to ask about extent, while どれほど is more literary and often used for emphasis or rhetorical questions.
どれほど is more formal and literary than どれだけ, and tends to appear in written or formal speech rather than casual conversation.
どれほど is more literary or formal than どのくらい, often appearing in written language or polite speech rather than everyday conversation.
どれほど is the question form asking 'how much/to what degree,' while それ程 states an already-known degree, often 'that much (and no more).'
Kanji spelling using 程; less common but still encountered.
Rare kanji form; may be confused with なにほど.
Very rare kanji form; not recommended for learners.
Compound of どれ (interrogative) and ほど (extent, degree). The kanji forms are ateji.