Estimate the posts, rails, panels, linear footage and total project cost for your fencing project. Choose from common fence types, enter the total fence length and post spacing to get a complete material and cost estimate.
Enter fence dimensions to see estimate.
Posts are spaced at regular intervals along the fence line. The number of posts is:
Posts = (Fence Length ÷ Post Spacing) + 1 + Gate Posts
Rails run horizontally between posts — two rails per span is standard for most styles, three rails for fences over 6 ft. Linear footage equals the total fence length and is used to estimate panel, picket or mesh quantities.
Post depth and size depends on fence height and type:
General rule: set posts 1/3 to 1/2 of total post length in the ground. Use concrete (2–4 bags per post hole) for permanent installations. Gravel-set posts allow drainage but are less stable.
With 8-foot spacing: (100 ÷ 8) + 1 = 13.5, rounded to 14 posts. Add 2 posts per gate opening. With 6-foot spacing you need 18 posts.
Most municipalities require permits for fences over 6 ft, fences in front yards, and fences near property lines. Always check setback requirements with your local planning department before digging posts.
Western red cedar and redwood are naturally rot-resistant and are the premium choices for wood fencing. Pressure-treated pine (ground-contact rated) is less expensive and highly durable. Untreated pine should not be used in ground contact.