Quick answer
The Fence Calculator shows posts, rails, and pickets for a fence of any length. How it works: Sections = length ÷ post spacing, rounded up; Posts = sections + 1. For example, with fence length of 100 ft, post spacing of 8 ft, and rails per section of 2, the posts is 14.
How to use the Fence Calculator
- Enter fence length.
- Enter post spacing.
- Enter rails per section.
- Enter picket width.
- Enter gap between pickets.
- Read posts and the breakdown. Use Share to send the exact numbers, or Print to save a PDF.
How it's calculated
- Sections = length ÷ post spacing, rounded up
- Posts = sections + 1
- Pickets = length ÷ (picket width + gap)
Worked example
With fence length of 100 ft, post spacing of 8 ft, rails per section of 2, picket width of 5.5 in, and gap between pickets of 0.5 in:
Posts: 14. Sections: 13.
Questions people ask
Do gates need extra posts?
Yes. Add one post per gate side and adjust for gate width.