Fence Calculator
Enter the total fence length and your post spacing. Each gate adds one extra post.
ft
ft
in
in
$
Privacy fences use no gap; a 1×6 picket is 5.5 in wide, a 1×4 is 3.5 in.
Result–
Fence posts by length
| Fence length | Posts (8 ft spacing) | Posts (6 ft spacing) | 1×6 privacy pickets |
|---|---|---|---|
| 50 ft | 8 | 10 | 110 |
| 100 ft | 14 | 18 | 219 |
| 150 ft | 20 | 26 | 328 |
| 200 ft | 26 | 35 | 437 |
| 250 ft | 33 | 43 | 546 |
| 300 ft | 39 | 51 | 655 |
Posts = (length ÷ spacing, rounded up) + 1 + gates
Pickets = length × 12 ÷ (picket width + gap)
Set posts about a third of their above-ground height in the ground: a 6 ft fence needs posts about 2–3 ft deep.
Questions
How many fence posts do I need for 100 feet?
14 posts at 8 ft spacing (13 sections plus one), before adding gate posts.
How deep should fence posts be?
About one third of the fence height, and below the frost line in cold climates. 2–3 ft is common for a 6 ft fence.
How many bags of concrete per fence post?
Usually 1–2 bags of 50 lb fast-setting concrete per post, depending on hole size.