Fence Calculator to estimate fence posts, panels or sections, post spacing, material waste, and preliminary fence cost.
Home & Construction Calculators
Plan a straight fence from total fence length, post spacing, waste, post price, and section price.
This straight-run estimate does not replace a layout for corners, gates, slopes, property lines, footings, utilities, wind exposure, or local fence rules.
About the Fence Calculator
This fence calculator estimates posts, fence sections, adjusted purchase quantities, and preliminary material cost for a straight fence run. It is useful for early planning and supplier comparisons.
Formula and assumptions
Posts = fence length ÷ post spacing, rounded up, plus one terminal post. Sections = posts − 1. Waste is applied to posts and sections before rounding up. Total cost adds posts, sections, and extras.
Worked example
A 100-ft fence with posts every 8 ft needs 14 posts including one terminal post and 13 sections. With 10% waste, plan for 16 posts and 15 sections. The final layout may change at corners, gates, slopes, and property-line transitions.
Measurement checklist
- Confirm the legal property line.
- Mark corners, gates, and changes in direction.
- Check slopes and finished grade.
- Locate underground utilities before digging.
Manual calculation steps
- Measure total fence length.
- Divide by planned post spacing.
- Round posts up and add a terminal post.
- Subtract one for sections.
- Apply waste and round purchases.
- Add gates, concrete, labor, and delivery.
Frequently asked questions
Why is one post added?
A straight run generally has one more post than the number of spaces between posts. Corners and gates may require additional posts.
Does this calculate fence height?
No. Entered prices should reflect the selected fence height and material. Posts, panels, rails, and concrete may change with height.
Does it include gates?
Enter gate materials, hardware, concrete, and installation in the extras field or estimate them separately.
Common mistakes
- Ignoring corners and gates.
- Placing posts without checking property lines.
- Using spacing that does not match panel width.
- Forgetting concrete, hardware, and slope adjustments.