You need 1962.5 fence posts.
80 acres is 880 x 440 feet. Depends on how many cattle and how rough they are on your post settings. Most people around here in Oklahoma put their t-posts roughly 16' apart. This will take 164 posts. A roll of barbed wire will usually run a quarter of a mile of fence. So on a typical 5 wire fence it will take 30 rolls of barbed wire.
6600 the correct answer is actually 6601 because you need one more post to close the fence.
It depends on what kind of animal you are trying to fence in (or out). For an average cattle pasture, I prefer setting them 10 feet apart, so you would need about 150 T-posts. I still prefer setting three six-inch treated wooden posts for each corner; they will hold up better to the tensioning of the fence/barb wire.
9
A privacy fence is usually quite costly. To figure out how much, first calculate how many feet of fence that will be needed.Then, decide between a wood fence or a vinyl one. Calculate how many posts you will need, knowing you need a post for about every six feet. Then calculate how nails you will need. About three per board. And finally choose your fence height.
It depends on what kind of fence you wish to put up. For example, an electrified barbed wire and steel post fence would only require about three posts. But a wood plank and wood post fence would require about five or six.
2
to answer that ? is the post is to the inside of the fence
Well, darling, it all depends on how big your fence panels are and how far apart you're spacing those posts. But typically, you're looking at around 1,320 feet of fencing per acre, so for 20 acres, you're gonna need roughly 26,400 feet of fencing. Divide that by the length of your panels to get the number of posts needed. Math isn't my strong suit, but I can throw some shade with the best of 'em!
yes they need to be set in concrete. depending on your fence, one bag of concrete per post should be enough.
56 posts are needed for the fence