ROUND PEN (Back to product) Home » Corrals/Stalls ROUND PEN « Previous | Next »Email Friend ROUND PEN CALCULATOR PANEL DIAMETER OF ROUND PEN (FEET) LENGTH 25 30 35 40 45 50 55 60 8 10 12 14 16 18 20 22 24 10 8 9 11 13 14 16 17 19 12 7 8 9 10 12 13 14 16 16 5 6 7 8 9 10 11 12 PANEL DIAMETER OF ROUND PEN (FEET) LENGTH 65 70 75 80 85 90 95 100 8 26 28 29 31 33 35 37 39 10 20 22 24 25 27 28 30 31 12 17 18 20 21 22 24 25 26 16 13 14 15 16 17 18 19 20 How to Calculate Your Round Pen To find the number of panels needed, multiply the desired diameter (straight line passing through the center of the circle) by 3.14. This will determine the circumference (the distance around the circle). Divide the circumference by the length of panels being used. This will equal the number of panels needed. NOTE: Sizes are approximate. Quantities exclude Entrance Panel. Pen diameters will vary depending on size of Entrance Panel or Corral Panel with Walk-thru Gate.