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.
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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.
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to answer that ? is the post is to the inside of the fence
To calculate the number of posts you would need to no the shape of the 20 acres. If we assume the land is square we can calculate the length of one side of the 20 acres as follows: 1 Acres equals 43,560 square feet 20 acres equals 20 X 43,560 = 871200 square feet. We can find the length of one side by taking the square root of 871200 = 933.4 feet. Divide the length of one side by the spacing of the posts and multiply by 4 to get the total number of posts. so for 12 feet spacing of posts 933.4 /12 X 4 = 312 posts.
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