Fence Calculator: Estimate Posts, Panels & Materials
Calculate fence materials, sections, posts, concrete, gravel, boards, rails, panels, gates, fixings, paint and estimated fencing cost from your actual fence dimensions.
Enter the total fence length, fence height, post spacing and fence style first, then add the post dimensions, hole depth, infill measurements, gates, waste allowance and optional pricing details. The Fence Calculator uses those measurements to estimate the number of fence bays or sections, line posts, gate posts, post length, rails, boards or pickets, panels or mesh rolls, concrete, gravel, fixings, paint or stain and total fence cost. The calculation supports feet (ft), metres (m), yards (yd), inches (in), millimetres (mm) and centimetres (cm) where applicable.
How to Measure Your Fence
Start by measuring each straight fence run from one end point to the other. Record the length (L) of every run, because separate runs can have different dimensions and quantities. Measure the finished fence height (H) above ground, select the desired post spacing from centre to centre, and choose whether the project uses picket or board fencing, ready-made fence panels, post and rail construction, or chain-link fencing.
For accurate material quantities, enter the board width (W) and gap for individual boards, or the panel or mesh roll width for manufactured sections. For the foundation, enter the post width, hole diameter and hole depth, together with any gravel base. The calculator can calculate hole depth from one-third or one-half of fence height, or use a custom depth when a project requires a specific foundation measurement.
Fence Calculator
Fence line & height
Posts, holes & concrete
Boards, rails & gates
Cost estimate ($)
How the Fence Calculator Works
The Fence Calculator converts your fence dimensions into practical material quantities by calculating bays from fence length and post spacing, then adding the required line posts, gate posts, rails, boards, panels or mesh, foundation materials, finish and optional costs. Each straight fence run can be entered separately so different lengths and quantities can be handled in the same project.
Measure the fence
Enter the length of each run, finished fence height and post spacing.
Choose the fence style
Select picket or board, ready panels, post and rail, or chain link.
Define the foundation
Add post size, hole diameter, hole depth, gravel base and concrete yield.
Review the estimate
Check posts, bays, infill, concrete, gravel, gates, finish and cost.
Fence Calculator Formula
The calculator uses the following core formulas to turn fence measurements into material quantities. The formulas account for post spacing, fence height, hole dimensions, gate openings, board width, board gaps, waste allowance and concrete volume.
Fence Calculator Example
A practical example shows how the Fence Calculator combines dimensions and material settings. Consider a straight residential fence run with one gate and standard board fencing.
The exact material quantities update automatically when measurements change. The example demonstrates the type of information required; actual board, rail, concrete, gravel, paint and cost quantities depend on the values entered into the calculator.
Helpful Information Before Using the Fence Calculator
01 Measure Every Fence Run
Measure straight runs individually when a fence changes direction, because each run can have a different length. Enter the run length and quantity so the calculator can combine multiple sections into one project total.
02 Use Centre-to-Centre Spacing
Post spacing refers to the distance between post centres. Common settings include 6 ft, 8 ft and 10 ft bays. The calculator rounds the number of bays upward so a run does not require fewer sections than the measured length.
03 Account for Fence Style
- Board or picket: uses board width, gap and rails.
- Ready panels: uses panel width and panel clips.
- Post and rail: calculates rails without board infill.
- Chain link: uses mesh roll length and fittings.
04 Include Gates Correctly
Enter the number of gates and the width of each gate. Gate openings reduce the infill length, while the selected number of extra gate posts increases the total post quantity.
05 Check the Foundation Dimensions
Post-hole concrete depends on hole diameter, post width and concrete depth. The calculator supports a one-third-height rule, a half-height rule and a custom hole depth. A gravel base reduces the concrete depth used in the volume calculation.
06 Allow for Waste
Cutting, damaged materials, uneven layouts and installation changes can increase material requirements. A 5% waste allowance is a useful starting setting, while complex layouts can require a higher allowance.
07 Understand Paint Coverage
Paint or stain quantity depends on fence face area, number of coats, number of sides and product coverage. For example, 200 ft² per gallon means one gallon covers approximately 200 square feet under the stated coverage conditions.
08 Treat Cost as an Estimate
Material and labour prices vary by fence material, supplier, region, installation method and project conditions. Enter current local prices for posts, rails, boards, panels, concrete, gates, paint, labour and delivery when using the cost estimate.
09 Check Site Conditions
Confirm property boundaries, local requirements and underground services before digging post holes. Slopes, stepped terrain, obstructions and unusual soil conditions can affect the practical installation requirements.
10 Use Consistent Units
Keep length measurements consistent when entering fence dimensions. The calculator supports ft, m and yd for the main dimensions and in, mm and cm for applicable post and foundation measurements.
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Frequently Asked Questions
Find clear answers to common questions about fence length, post spacing, fence panels, boards, concrete, gates, paint and fencing costs.
01 How do I calculate how many fence posts I need?
Divide the fence length by the selected post spacing and round the result up to determine the number of bays, then add one line post per completed run. Gate posts are added separately according to the selected extra-post setting. For example, an 80-ft straight run at 8-ft centres creates 10 bays and 11 line posts, before any additional gate posts are included.
02 How many fence panels do I need for my fence?
Divide the usable infill length by the selected panel width and round the result up. The Fence Calculator uses the selected panel width, fence length, terrain allowance, gate openings and waste setting to determine the required number of ready-made panels.
03 How is the number of fence boards calculated?
Board quantity is based on board width plus the gap between boards. The calculator divides the usable infill length by that combined board module and applies the selected waste allowance. A wider board or smaller gap generally reduces the number of boards required for the same fence length.
04 How deep should a fence post hole be?
The calculator provides one-third of fence height, one-half of fence height or a custom hole-depth option. The practical foundation depth depends on fence height, local ground conditions, frost requirements, soil stability, wind exposure and applicable construction requirements, so the calculated quantity is an estimate rather than a site-specific engineering specification.
05 How much concrete do I need for fence posts?
Concrete volume is calculated from the hole area minus the post area, multiplied by the concrete depth and total number of posts. The calculator then converts the volume into the selected concrete-bag yield and rounds the number of bags upward, including a small material allowance.
06 Does the Fence Calculator include gates?
Yes. Enter the number of gates, the width of each gate and the number of extra posts required per gate. Gate openings are deducted from the infill length, while gate posts are added to the total post count.
07 Can I calculate fence paint or stain quantity?
Yes. Select the finish option, enter product coverage, then choose the number of coats and sides. The calculator uses fence face area, coverage, coats and sides to estimate the required gallons. For example, 400 ft² of fence face at 200 ft² per gallon requires 2 gallons for one coat on one side before rounding or additional coats are considered.
08 Can I estimate the total cost of installing a fence?
Yes. Enter the applicable prices for the fence system, posts, rails, boards or panels, concrete, gates, paint, labour, digging, removal, fixings and additional costs. The calculator can price the fence system by linear foot, linear metre, bay, panel or square foot of fence face, then combines the entered costs into an estimated project total.
09 Can I calculate a fence with multiple sections?
Yes. Add another run for each separate straight fence section and enter its length and quantity. The calculator calculates each run's bays and posts before combining the results into the total fence length, bays, posts and material estimate.
10 Does the calculator work for chain-link and post-and-rail fences?
Yes. The Fence Calculator supports four fence styles: picket or board, ready panels, post and rail, and chain link. Chain-link calculations use mesh roll length and fittings, while post-and-rail calculations focus on posts and rails rather than board infill.