Fence Calculator
Enter your total fence length and panel width to estimate how many panels and posts to buy.
Last updated: September 25, 2026
Frequently asked questions
How many posts do I need for 100 feet of fence?
At 8 ft panel spacing, 100 ft of fence needs 13 panels and 14 posts - one extra post to close both ends of the run.
Why is post count one more than panel count?
Each panel needs a post at both ends, but adjacent panels share a post, so total posts always equal panels plus one for a straight run.
How far apart should fence posts be spaced?
6 to 8 feet apart is typical for most residential fencing, though the exact spacing depends on the panel size you're using and local wind/soil conditions - check your specific fence panel's recommended spacing before finalizing post count.
Does this account for gates in the fence line?
This calculator estimates posts and panels for a continuous fence run; if your fence includes one or more gates, subtract the gate width from the total fence length before calculating, since gates use separate hardware rather than standard panels.
How many posts and panels do I need for 150 ft of fence with 6 ft panels?
150 ÷ 6 = 25 panels exactly, which needs 26 posts - one more than the panel count to close both ends of the run.
Does a fence line with corners need more posts than this calculator shows?
Yes - this calculator assumes one continuous straight run. Each corner needs its own post regardless of panel spacing, so measure and calculate each straight segment separately, then add one extra post per corner rather than treating the whole perimeter as a single length.
Why can't I just divide fence length by panel width to get the post count?
Dividing length by panel width gives you the panel count, but undercounts posts by one on a straight run, since adjacent panels share a post except at the two open ends of the line - that's why this calculator reports posts as panels plus one.