-만큼

Attached to a noun, it marks the standard of comparison: 'as … as N, to the same degree as N'. 만치 is an older, less common variant.

정도·비교Degree & comparison

Han: 만큼 means 'as … as' (equal degree) and cannot be used with 더; 'more than' needs 보다.

Examples

이 도시는 서울만큼 복잡하지 않아요.This city isn't as hectic as Seoul.

저도 언니만큼 요리를 잘하고 싶어요.I want to cook as well as my older sister.

부모님의 사랑은 하늘만큼 크고 넓다.Parents' love is as great and wide as the sky.

N+만큼 (variant: 만치)

형 → 형만큼; 나 → 나만큼; 하늘 → 하늘만큼; 이/그/저 → 이만큼, 그만큼, 저만큼

After a noun it is a particle written without a space (나만큼); after a verb or adjective modifier it is a separate noun (먹은 만큼), a different pattern.
Very common in negatives: N만큼 -지 않다/못하다 'not as … as N': 서울만큼 크지 않아요.
It shows equal degree, so it does not combine with 더 'more'; for 'more than' use 보다.
It can take other particles: 너만큼은, 그만큼도; 이만큼/그만큼 mean 'this much / that much'.

Wrong: ~~이 가방은 그 가방만큼 더 비싸요.~~

Right: 이 가방은 그 가방보다 더 비싸요.

만큼 means 'as … as' (equal degree) and cannot be used with 더; 'more than' needs 보다.

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