The phrase "needed amount" refers to the specific quantity or level of something that is required or necessary. It indicates the exact amount that is needed, without any excess or shortage. Full definition
You do not need the amount of money (and stress) that you think you do. (mindbodygreen.com)
I didn't need the amount of coverage I was sold and My premiums would have been a decent amount lower had I been sold the appropriate coverage. (consumeraffairs.com)
However, I just need this amount to pay everything off so that I can have one bill and save on interest. (finder.com)