Building a fence

Round Posts

Diameter Area %age of 4" post Breaking Force %age of 4" post
2.5" 4.91 39% 238 lbs 25%
3" 7.07 56% 408 lbs 42%
3.5" 9.62 77% 650 lbs 67%
4" 12.57 100% 970 lbs 100%
5" 19.64 156% 1893 lbs 195%
6" 28.27 225% 3268 lbs 337%

Posts should have approximately 1/3 of their length in the ground