Fence Posts
Calculator

It divides your total fence length by the spacing between posts (commonly 6-8 feet for wood fences), then adds one to account for the post at the starting end, since posts mark both ends of each section.

Heavier or more wind-resistant materials like solid privacy panels need closer post spacing (6-8 feet) to handle wind load without sagging, while lighter materials like wire or picket fencing can span 8-10 feet between posts without structural issues.

It should be adjusted manually for them: corner posts need to be counted once per corner (they're shared between two fence runs, not doubled), and gate posts are typically set with extra depth and sometimes concrete reinforcement since they bear more stress from the swinging gate.

End, corner, and gate posts absorb more lateral force from wind and gate use, so they're typically set deeper and with more concrete than the line posts in between, which only need to resist the fence's own weight and moderate wind load.

A general rule is one-third of the post's above-ground height, with a minimum of 24 inches for most residential fences, though frost line depth in cold climates can require going deeper regardless of fence height to prevent posts from heaving in winter.