I typically get 25% of my wet weight as my dry weight so 1/2 oz dry would be about 2-2.5 wet. Size wise its gonna be extremely variable, very dense nugs will look smaller and weigh more then large airy buds. Perfect example I had one plant I harvested a few weeks ago which had a huge(larger then coke can) bud on it that only weighed 10g because it had an issue and was airy, and another plant that had a bunch smaller buds that were about a half oz that would have all fit inside a starbucks cup like prosperian showed.