How much fence do I need for a 20 × 20 area?
Fencing all four sides is 80 ft. As an enclosed loop of 6-ft privacy fence with one 4-ft gate, that requires 10 sections, 12 posts, 32 rails and 179 boards with waste, set with 24 bags of 80-lb concrete.
Calculators · United States
CalcFence
Free fence calculators for posts, rails, pickets, panels, concrete and installed cost estimates
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A collection of free online calculators that help homeowners and DIY builders determine the exact materials needed for fence projects, including posts, rails
The story so far
CalcFence provides free fence calculators that determine the materials and costs needed for fencing projects. Users enter a fence length, height, style and gate count, and the calculators return the number of posts, rails, pickets or panels needed, plus bags of concrete for installation. The site includes separate calculators for chain link, vinyl, wood, split-rail and other fence types, as well as cost calculators that estimate installed prices by material and state. All formulas are published on the site, with guides explaining post spacing, post depth, gate calculations and waste allowances.
Typeset features
- Material quantity calculators for posts, rails, pickets and concrete
- Installed cost estimates by material type and US state
- Support for multiple fence styles including privacy, picket, chain link, vinyl and split-rail
- Gate calculations and multiple layout options
- Published formulas and calculation methodology
- Planning guides covering post spacing, depth and frost lines by state
Pricing
Pricing model: Free
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CalcFence metrics
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Lead topic: Recreation/Pets (4). Majestic set 7 Nov 2026, reset 7 Nov 2026. Link data typeset by Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.
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Questions and answers
How many posts do I need for a 200-ft fence?
For 8-ft spacing with no gate, you need 26 posts. At 6-ft spacing, 35 posts are needed, and at 10-ft spacing, 21 posts. Each gate adds two more posts, and every corner of a U- or L-shaped layout needs its own post.
How much concrete do I need per fence post?
A 4×4 post in a 10-in hole 2 ft deep requires 0.92 cu ft to fill: 2 bags of 80-lb mix, or 3 of the 60-lb or 50-lb size. For 150 ft of 6-ft fence on 20 posts that totals 40 bags of 80-lb or 60 of the 60-lb size.
How many fence boards do I need?
Divide each section's clear width by the board width plus any gap and round up, then multiply by the number of sections. For 1×6 boards butted together on 8-ft spacing that is 17 per section, about 2.1 boards per foot of fence; spaced 1×4 pickets with a 2.5-in gap come to 2 per foot.
How many rails does a 150-ft fence need?
At 6 ft tall and 8-ft spacing, 19 sections take 57 rails, or 60 with 5% waste. A 4-ft fence on the same line needs 40 with waste and an 8-ft fence needs 80.
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