This has caused much confusion, because of the use of what are now fairly unknown old imperial units (talking relatively).
As a linear measure, a rod (or pole, or perch) is quarter of a chain, which is 22yds (cricket pitch?), hence a rod is 5.25 yds.
The term has also been extended though to cover a measure of area, so a rod (or pole, or perch) can also be used to describe an area of ground, which is how it is used in describing allotments. Technically speaking, this would be a square rod, since the area is 5.25 yds along each side, but it is still just referred to as a rod.
Therefore, a rod consists of an area of approximately 27.5 sq yds. No idea what this is in metres, my days as a bilingual engineer are long gone.
Thus, if your plot is rectangular, and you can measure the sides in yards, multiply the length by width to get the sq yds, then divide by 27.5 to get the rods ...
If it is slightly tapered, as most on our site are, you need to measure both opposite sides to get the average ... thus area = average length x average width
If your plot is 6 poles, then this will be about 165 sq yds, ie essentially the same as 150 yd plot.
Hope this helps, if not, then sorry :)
Update - just noticed your edit to 5 rods ... this would make it about 138 sq yds.
