Fence Calculator: 300 ft fence
Count posts, rails, pickets and bags of concrete for a wood fence from its length and post spacing.
// Bill of materials
Costs are rough, materials only — edit the price to match your quote.
Pre-filled for a 300 ft fence. Change any value to recalculate, or start from scratch.
How it's calculated
Sections = fence length ÷ post spacing, rounded up. Posts = sections + 1. Rails = sections × rails per section. Pickets = fence length (in inches) ÷ picket width, rounded up. We plan 2 bags of concrete per post.
Worked example — 300 ft fence
- Fence length
- 300 ft
- Post spacing
- 8 ft
- Rails per section
- 3 rails (6 ft+)
- Picket width
- 5.5 in
- Price per post
- 12 $
Nearby sizes
Tips for buying fence
- Set corner and gate posts first and run a string line — everything else references them.
- Bury posts at least a third of their above-ground height, below your frost line.
- Two 50 lb bags of concrete per post is a safe plan for a standard wood fence.
- Leave a small gap between pickets for airflow and wood movement, or they'll cup and split.
- Order a few extra pickets — you'll cull the worst ones and want spares for the last section.
- Check your property line and call 811 to locate utilities before you dig.
Frequently asked questions
How many fence posts do I need for 100 feet?
At 8 ft spacing you get 13 sections, so 14 posts (sections + 1). Closer spacing means more posts but a stronger fence.
How far apart should fence posts be?
6 to 8 feet is standard for wood fences. Closer spacing is stiffer; wider spans can sag over time.
How many bags of concrete per fence post?
Plan on about two 50 lb bags per post for a typical wood fence. Taller or windier runs may want more.
How many pickets do I need?
Divide the fence length in inches by the picket width. A 100 ft fence of 5.5 in pickets is about 219 pickets with no gap — add a little for gaps and culls.