정도, 만큼 : describing a size in volume or level

This is long so that it can be written as a world record.

이것은 세계 기록으로 기록될 정도로 (만큼) 길다.

He is smart so that he can go to Harvard.

하버드에 갈 만큼(갈 정도로) 똑똑하다.

@ They have almost same usage. But 정도 (degree) can used to explain a fixed point or area in our tacit consent.

Our patience has a limit.

참는 것도 정도가 있다.

But 만큼 need a explaining clause or phrase in the sentence.

정도, 만큼 : describing a size, volume or level

This is so long it could be recorded as a world record.

이것은 세계 기록으로 기록될 정도로 (만큼) 길다.

He is so smart he could go to Harvard.

하버드에 갈 만큼(정도로) 똑똑하다.

@ They have almost the same usage, but 정도 (degree) can be used to explain a fixed point or area in our tacit consent.

Our patience has a limit.

참는 것도 정도가 있다.

But 만큼 needs that additional clause or phrase in the sentence.