How Many Fence Posts and Panels Do I Need?
Enter your fence length and spacing to get a complete materials list — panels, posts, rails, and a concrete planning estimate.
⚡ Quick Answer
A 100 ft fence using 8 ft panels needs 13 panels and 14 posts — the +1 already includes both end posts. With 2 rails per section: 26 rails. Add 1 post per gate and 1 per corner turn. A rough concrete estimate is 2 bags per post.
Fence Dimensions
Gates & Corners
Base posts (sections + 1) already include both end posts. Add extras below for gates and turns.
Gates add 1 extra post each (latch side). Corners add 1 extra post each (for turns and angles).
Rails & Pickets
Leave pickets at 0 to skip. Enter pickets per panel only if using individual boards instead of prefab panels.
Fence Panels
—
panels needed
—
panels needed
Total Posts—
Total Rails—
Concrete (est.)—
Pickets—
How We Calculated This
How Post Count Works
The base formula is sections + 1. This already includes both end posts — one at each end of the run.
The base formula is sections + 1. This already includes both end posts — one at each end of the run.
13 sections → 14 posts (not 16)
Gates and corner turns add 1 extra post each for the latch side or turning point — not 2, since the other side is already a line post.
Post Spacing Guide
6 ft spacing — Stronger, better for wind exposure or tall fences. More posts, more cost.
6 ft spacing — Stronger, better for wind exposure or tall fences. More posts, more cost.
8 ft spacing — Standard for panel fencing, matches common prefab panel sizes.
Check local codes — some areas have maximum spacing requirements based on fence height.
Concrete Per Post Hole
This calculator uses 2 bags per post as a quick planning estimate.
This calculator uses 2 bags per post as a quick planning estimate.
Actual concrete depends on hole diameter and depth. A 10″ hole at 3 ft deep uses about 3 bags of 80 lb concrete.
Fence Materials by Common Length
8 ft panels · 2 rails per section · 2 bags concrete per post · Straight run, no gates or corners
| Fence Length | Panels | Posts (incl. ends) | Rails | Concrete Bags |
|---|---|---|---|---|
| 50 ft | 7 | 8 | 14 | 16 |
| 75 ft | 10 | 11 | 20 | 22 |
| 100 ft | 13 | 14 | 26 | 28 |
| 150 ft | 19 | 20 | 38 | 40 |
| 200 ft | 25 | 26 | 50 | 52 |
| 300 ft | 38 | 39 | 76 | 78 |
Posts column includes both end posts. Add 1 per gate and 1 per corner turn using the calculator above.
Frequently Asked Questions
How many fence panels do I need for 100 feet?
A 100 ft fence using 8 ft panels needs 13 panels — 100 ÷ 8 = 12.5, rounded up to 13. Adding 5% waste brings the order to 14 panels. Use the calculator above for your exact length and spacing.
How far apart should fence posts be?
Standard post spacing is 6 to 8 feet on center. Eight feet is the most common for prefab panel fencing. Six foot spacing is stronger and better for high-wind areas or fences over 6 ft tall. Always check local building codes before setting posts.
How many posts do I need for a fence?
For a straight run, use sections + 1. This formula already includes both end posts — one at each end of the run. A 100 ft fence at 8 ft spacing = 13 sections + 1 = 14 posts. Then add 1 post per gate and 1 post per corner turn.
How many rails do I need for a fence?
Multiply sections by rails per section. Most residential fences use 2 rails per section. A 6 ft privacy fence often uses 3 rails for added support. A 100 ft fence at 8 ft spacing = 13 sections × 2 rails = 26 rails.
How much concrete do I need per fence post?
A quick planning estimate is 1 to 3 bags of 80 lb concrete per post. A 10-inch diameter hole at 3 feet deep uses about 3 bags. This calculator uses 2 bags per post as a conservative baseline. For exact amounts by hole size, use our Concrete Calculator.
Do gates need extra posts?
Gate posts are usually the line posts on either side of the opening — already included in your base post count. This calculator adds 1 extra post per gate as a conservative allowance for a dedicated latch-side post or a double post on heavy gate installations.
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