It varies from the size of the jar, but most medium sized ars hold about 28 oz. :) In the UK, peanut butter comes in jars of 8oz, 12oz, or 16 oz.
In a peanut butter there are many many peanuts!!..
The Average price for a jar of Peanut Butter is $3.29.
it depends on where you live.
Scraping the inside of the jar with a rubber spatula is the most thorough way I've found so far.