Fence Post Calculator
Determine how many posts are needed based on run length and post spacing.
Step 1: Units
Step 2
Enter project measurements
Use decimals if needed (e.g. 3.5).
How to use this calculator
Enter total fence length and target spacing between posts.
What the math is doing
Posts = floor(length ÷ spacing) + 1 for a closed run with end posts.
Frequently asked questions
Terminal posts?
Gate posts are often larger.
Braced corners?
Hardware is separate.
Post depth?
Typical 24–36 in frost depth varies by region.
Metal posts?
Same spacing math.