For larger areas, use the following formula: Multiply the total acreage by 43,560- i.e. 10 acres x 43,560 = 435,600
Find the square root of the above number - square root of 435,600 = 660 (this is the length of each side of a 10 acre area that is square in shape. Even if your area is not square, if you multiply this number by four, this is the approximate length of the four sides of a 10 acre area.)
Therefore, one would need approximately 2,640 feet of wire to enclose the perimeter of a 10 acre area. You will need additional wire to run from the transmitter to the perimeter and/or for any interior loops, etc.