One 18 ounce jar of peanut butter equals a little more than 2 cups. [This is true if a jar is 18 fluid ounces, but if it is 18 ounces as a measure of weight, this is probably off.]
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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.