Fence Materials Calculator
Enter your fence run length, post spacing, and picket dimensions to get an instant material list — posts, pickets, and concrete bags — all in one place.
How it works
Enter your total fence run in feet, your post spacing (typically 6 or 8 feet), and your picket width and gap in inches.
Posts = ceil(run ÷ spacing) + 1 end post. Pickets = ceil(run × 12 ÷ (picket width + gap)).
The concrete bag count links to the concrete bag calculator — typically 2–3 × 80 lb bags per post for a standard 10-inch diameter, 30-inch deep hole.
Reference chart
Post and picket counts for a 100 ft fence run
| Post spacing (ft) | Posts | Pickets (5.5 in + 0.5 in gap) |
|---|---|---|
| 6 | 18 | 200 |
| 7 | 16 | 200 |
| 8 | 14 | 200 |
| 10 | 11 | 200 |
Frequently asked questions
Should I space fence posts 6 feet or 8 feet apart?
6-foot spacing is stronger and better for vinyl or heavy cedar; 8-foot spacing uses fewer posts and is common for standard 8-foot fence panels. Check the panel or board manufacturer's recommendation.
How much concrete do I need per fence post hole?
A standard 10-inch diameter, 30-inch deep post hole holds about 1.36 cu ft (π × (5/12 ft)² × 2.5 ft). Subtract ~0.21 cu ft for a 4×4 post and you need ~1.15 cu ft — about 2 to 3 × 80 lb bags per post.
How do I calculate the number of pickets for a fence?
Divide run length in inches by (picket width + gap). For 5.5 in pickets and 0.5 in gaps on a 100 ft run: 1,200 ÷ 6 = 200 pickets. Always round up.