Garden & Outdoor calculator
What Fence Panel Size Do I Need?
Use your measurements for total fence run, post width, and panel nominal width to find fence panel count and final cut width.
Enter your measurements
For what fence panel size do i need, use the real measurements for total fence run, post width, and panel nominal width. The calculator then reports fence panel count and final cut width and keeps any manufacturer- or rule-specific checks separate.
- Total fence run — Required
- Post width — Required
- Panel nominal width — Required
Fence panel count and final cut width
Enter the measurements above to calculate fence panel count and final cut width.
How the calculation works
For this tool, the calculation is panelCount=max(1,ceil((totalFenceLength-postWidth)/(panelNominalWidth+postWidth))); fullPanels=max(0,panelCount-1); finalPanelWidth=max(0,totalFenceLength-(panelCount+1)×postWidth-fullPanels×panelNominalWidth); finalPanelWidth=min(panelNominalWidth,finalPanelWidth). That produces fence panel count and final cut width without borrowing assumptions from unrelated calculators.
Worked example
Example: Total fence run = 1000 cm; Post width = 60 cm; Panel nominal width = 60 cm. Result: Final Panel Width = 40 cm; Full Panels = 7; Panel Count = 8.
Before you decide
Use measured dimensions rather than nominal labels. This page calculates the stated geometry or quantity only; product-specific construction or installation details can still affect the final choice. For what fence panel size do i need, the limiting result on this page is fence panel count and final cut width.
Direct measurement/geometry calculation. No external reference is required for the arithmetic itself; the result is derived only from the user-entered measurements and the formula stored in calculationLogicJson.
Frequently asked questions
How does the Fence Panel Size | Size Guide calculator work?
It uses panelCount=max(1,ceil((totalFenceLength-postWidth)/(panelNominalWidth+postWidth))); fullPanels=max(0,panelCount-1); finalPanelWidth=max(0,totalFenceLength-(panelCount+1)×postWidth-fullPanels×panelNominalWidth); finalPanelWidth=min(panelNominalWidth,finalPanelWidth). The result is fence panel count and final cut width.
Which measurements or specifications do I need?
Use these inputs: Total fence run, Post width, Panel nominal width. Measure or copy the values from the exact product/specification rather than guessing.
Is the result a guarantee that the product will fit or be suitable?
No. The calculator answers the stated fence panel count and final cut width question. Manufacturer instructions, safety rules, certification, installation tolerances or brand-specific size charts can impose additional requirements.