How do you estimate fence materials from a layout?
Draw each uninterrupted fence run between corners, ends and gates. Measure each run separately, exclude the clear gate openings from fence-run lengths, then choose a maximum post spacing. The calculator rounds each run up to a whole number of bays and adds a terminal post at each end. This deliberately counts separate endpoints on separate runs. Review a plan to combine posts physically shared at corners or gate openings.
Fence material quantities use this existing board or panel worksheet. Chain-link mesh and terminal hardware have a separate dedicated calculator because their material schedule differs.
How many fence posts and bays do you need?
For a run of length L and maximum center-to-center spacing S, bays = ⌈L ÷ S⌉ and run posts = bays + 1. Actual equalized spacing is L ÷ bays and never exceeds S. For a 20 ft run with a 7 ft maximum, three bays have 6.67 ft equalized centers and four posts. Add two gate posts per separate gate when its endpoints are not already counted in a run.
Bays = ⌈run length ÷ maximum post spacing⌉
Posts = bays + 1
Actual post spacing = run length ÷ bays
How should gate openings be measured?
Record the clear planned gate opening separately from fence-run length. The worksheet adds one gate unit and two dedicated gateposts per opening. Gate width is for overall boundary length only; the gate panel and hinges are not manufactured by the picket calculation. Product hardware specifies required clearance and post reinforcement. If a gatepost is already the endpoint of an entered run, subtract that shared physical post from the conservative total during plan review.
How are pickets counted between fence posts?
The worksheet estimates pickets in every bay from its equalized center spacing less the entered post face width. Given actual picket face width P and desired gap G, the number in a bay is floor((clear bay width + G) ÷ (P + G)). Multiply by that run’s bay count. Leftover width is shown as a margin at the two edges of each bay, assuming even centering. Product dimensions, edge attachment and privacy requirements may change the cut layout.
What changes for privacy panels instead of individual pickets?
Select panel mode when ordering one factory panel per bay. The result is a bay and panel count, with a warning that each actual bay must fit the manufacturer’s maximum usable panel span. Post centers and clear panel opening are different measurements. Confirm brackets, panel insertion allowance, panel width and post face before buying a fixed-width product. No picket count is generated in panel mode.
How many horizontal rails are needed?
Choose the intended rails per bay. Rail pieces per bay equal the selected rail count multiplied by ceil(actual center span ÷ usable stock length). The worksheet counts whole pieces for each bay rather than treating the entire perimeter as one reusable rail; it does not optimize offcuts. Posts, end connections and rail overhang alter exact cut lengths. Verify rail size and fastener schedule for the height and wind exposure.
How much concrete is needed for fence post holes?
A cylindrical hole uses π × (hole diameter ÷ 2)² × embedment depth. The worksheet multiplies by the conservative post count and optionally subtracts a cylindrical post displacement based on entered post face width. It then applies an explicit allowance and divides by your entered bag yield, rounding up to whole bags. For a square post in a round hole, this cylindrical displacement is an approximation; do not use this quantity as a structural footing design.
Concrete volume ≈ post count × π × [(hole radius)² − (post radius)²] × depth
How do feet, inches and metric units work?
Choose feet/inches or meters/millimeters. Run lengths, fence height, maximum post spacing, rail stock and embedment are linear units; picket and post faces, gaps and hole diameter use small units. Switching units converts populated dimensions so an existing worksheet represents the same physical layout. Counts should remain unchanged except at a rounding boundary caused by entered precision.
What does a two-run fence example look like?
- Measure two independent 20 ft runs, each excluding the gate opening.
- At a 7 ft maximum spacing each run needs 3 bays and 4 posts.
- That is 6 bays and 8 conservative run posts before gates.
- Add one separately counted gate and its two gateposts, giving 10 conservative posts.
- At 3 rails per bay, plan 18 rail runs, then check actual stock cuts.
If the gateposts also terminate your measured runs, deduplicate them on your drawn plan before ordering.
How should waste and prices be applied?
Enter a cutting allowance for purchased pickets or panels and rails. It does not inflate the geometric number of bays, posts or post holes. Optional unit prices use the whole post, picket or panel, rail and concrete-bag counts shown. The cost is a material-only subtotal in your entered currency and excludes gates, hinges, fasteners, tax, delivery, labor, site preparation and permits.
Which layout details should be checked before ordering?
Confirm the property line, utilities, terrain changes, local requirements, product-specific spacing, gate clearance and attachment instructions. Long runs on sloped ground may need stepped or racked bays. The worksheet assumes straight level runs and equalized post spacing. A corner post serving two runs, an irregular end bay, or a gatepost counted twice needs a site plan adjustment.
When should you use a different fencing calculator?
This calculator plans posts, bays, rails and wood-style pickets or panels. For chain-link fabric, tension wire and terminal fittings, use the chain-link fence calculator. For a concrete material order based on a different footing design, use the concrete calculator. Keep a copy of supplier drawings alongside this early estimate.
