🧱 Construction
Fence Post Calculator
Posts are set at regular intervals, so the number of sections is the length divided by the spacing, rounded up — and then you need one more post than sections. Each gate adds two dedicated posts because a gate post carries the hinge and latch loads rather than just holding up rails.
How it works
Total fence length
Post spacing
Gates
Rails per section
Picket width
Gap between pickets
Posts
Sections
Rails
Pickets
Actual length per section
Frequently asked questions
How do I use the Fence Post Calculator?
Fill in the fields above — the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.