We raise livestock on our small farm. We are also butchers. We have a USDA Processing Facility in Kentucky. For a family, I would recommend only taking the hog to 250-280 lbs. That's about our market weight. There is little loss to a hog. A good hog should dress at about 75%. We only charge 45 cents per lb dressed wt to process and a $45 slaughter/rendering bill. So a 250 lb hog would cost approx $130.00. We also smoke the bacons and slice them $$2.00 per lb. A 250 lbs hog would have a green belly wt of approx 24-25 lbs and the yield of bacon would be about 20-22 lbs for both bellies with an additional cost of approx $48 making the total around $180.00.
Gosh, folks in Kentucky must be getting a bargain compared to the other post in Washington.
As for how much meat do you get, well that depends on how much fat has to be trimmed away and how you decide to have one cut. Typically, you would get the bacons as aove at around 20lbs or so. Standard cuts around here would be pork chops @ about 40 pcs or so for both sides (depending on how thick you like them cut). Then you would get approx 8-10 boston butt roasts, if you like ham roasts you could get approx 8-10 or hams roats and approx 6-8 shoulder roasts or if you like fresh ham steaks and shoulder steaks you would get...well, alot of them. Also pork steak are popular (off the butt portion of the shoulder) and you would also get alot of those considering 8-10 butt roasts would not be in sliced pk steak. Then there's the spare ribs and boy do I love the spare ribs. You get two full racks (one from each side) or if you chose to have boneless pork chops, you would also get the baby back ribs and two pork tenderloins. Just depends on what you like. There's also the backbones which are great for soups and such. If you chose to have boneless chops and baby backs you would also get the backbones, which are also great for soups, but we cook them like ribs. There are alot of options on a hog. Best of all...little to no waste. You also have several hocks, another great soup seasoner. Even with all of those cuts, you are still bound to get 25-30 lbs of sausage.
I would have to say finished meat out of a 250 lb market hog would yield approx 170 lbs of meat or better. But again, it depends on how you choose to have it cut.
Our family has been processing hogs for 40+ years. I would have to disagree slightly with the previous post on yields. I believe you can get more for less, but it depends on the processor rates in your area. Ours are much lower than stated here.