Fence Calculator
Enter your fence run to get the number of posts, panels, and bags of concrete for the post holes.
Updated September 1, 2026 ยท Estimates for planning, not a quote
How to estimate a fence
Divide the fence run by your post spacing and round up, then add one for the starting post plus an extra post at each gate opening. Panels (the bays between posts) are simply the run divided by spacing, rounded up.
Concrete for the holes
Each post hole is a small cylinder: π × radius² × depth. This calculator totals that volume across every post and converts it to 80 lb bags, same as the concrete calculator.
Pricing out the whole project rather than just the post count? Our fence installation cost guide breaks down installed and DIY prices per linear foot for wood, chain link, vinyl, and aluminum, plus what gates and post setting add.
Method and sources
Eight foot post spacing is the interval fence contractors work to because it is the stock length of a rail and a preassembled panel, not because a standard sets it. One bag of concrete per hole is the matching rule of thumb most suppliers quote for a residential line post.
Posts are the run divided by the spacing, plus one to close the far end, plus one for each gate, and gate widths come out of the run before the posts are counted. Concrete per hole uses the same cylinder volume as the concrete calculator. Frost depth is a local code question and will often set your hole depth for you.
QuantiYard writes its own formulas and states them in plain language on every page. How these numbers are made covers where the constants come from, how waste factors are chosen, what these calculators deliberately do not do, and how to report an error.
Save the fence post chart
Sections and posts for five run lengths at standard 8 foot spacing. Save it and lay the run out before you dig.
Save to PinterestOpens Pinterest with the chart and link ready to go.
Fence calculator FAQ
How far apart should fence posts be spaced?
8 feet is most common for wood privacy and picket fences. Chain link often uses 10 feet; taller panels sometimes need 6 feet.
How deep should a fence post hole be?
A common rule is one third of the post's above-ground height, minimum 24 inches for a standard 6 foot fence. Cold climates need holes below the local frost line.
Do I need concrete for every fence post?
Corner, end, and gate posts should always be set in concrete. Line posts can sometimes use compacted gravel instead, depending on fence style and soil.
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