Fence Calculator
Estimate fence materials and cost before you buy, then adjust the plan to fit your layout and preferred style.
- 2026 figures, checked October 26, 2026
- Private: runs in your browser
- How we check our work
Result
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Verify before you act: review these results with a licensed contractor, engineer or the local building department before making any decision based on them.
Suggestions for your numbers
Updated as you type, from your inputs only. General information, not personal advice; confirm any change with a qualified professional.
See it over time
Hover over or tap the chart to see the numbers for any point.
What is a fence calculator?
A fence calculator estimates the materials you may need for a planned fence. Enter the length, post spacing, rails per section, gate count and picket details to get estimated counts for posts, rails, pickets and concrete.
A fence post calculator helps you plan post quantities, while a fence cost calculator can help you estimate installed cost when you enter a price per foot. These estimates are a starting point, not a substitute for a site measurement or a supplier’s material list.
Why a fence calculator matters
Material counts affect your project budget and buying plan. A useful estimate helps you compare fence styles, decide whether to change the layout and get a clearer quote from an installer.
Post spacing and picket gaps change the count. A gate can also affect the post total. Check the estimate against your actual layout before ordering, especially where the fence meets a building, corner or uneven ground.
How to use this fence calculator
- Enter the total fence length in feet. Measure the planned fence line rather than relying on a rough property estimate.
- Enter the post spacing and rails per section. Use the spacing you intend to build with, and check that it suits your fence design and materials.
- Enter the number of gates and choose picket or privacy style. For a picket fence, add the picket width and gap. A zero gap means the pickets are placed side by side.
- If you have an installed price per foot, enter it to estimate cost. Leave it at zero if you do not have a price to use.
- Review the material counts and cost estimate. Confirm measurements, gate placement and material specifications with your installer or supplier before buying.
Fence calculator example
Worked example
With a fence length of 150 ft, post spacing of 8 ft, 2 rails per section, 1 gate, picket style, 5.5-inch pickets, a 0-inch gap and an installed price of 0 per foot, the calculator returns 21 posts, 19 sections of 8 ft, 38 rails, 328 pickets and approximately 42 80 lb bags of concrete. The section count rounds 150 / 8 up to 19. Posts are 19 sections + 1 + 1 gate = 21. Pickets are 150 × 12 / 5.5, rounded up to 328.
How to read your fence calculator results
Sections are the spaces between posts. The calculator rounds a partial section up to a whole section, so the total section length may be longer than the fence length you entered. Posts include an end post plus the gate adjustment shown in the formula.
Rails are based on sections multiplied by rails per section. Pickets are estimated from fence length, picket width and the gap. The concrete count is marked approximate, so check the bag quantity against your post dimensions and ground conditions. An installed cost estimate depends on the per-foot price you enter; it is not a contractor quote.
How to improve your fence estimate
- 01
Measure the fence line carefully
Walk the planned route and note corners, changes in direction and gate openings. Update the total length if the layout changes, then compare the new count with your first estimate.
- 02
Use your chosen design details
Enter the actual post spacing, rail count, picket width and gap for the materials you plan to use. If you are comparing picket and privacy styles, run separate estimates rather than assuming their material needs match.
- 03
Get a price tied to your project
Ask an installer for an itemized quote and enter its installed price per foot to get a planning estimate. Confirm what the quote includes, such as gates, site preparation and cleanup, before comparing offers.
Common fence calculator mistakes
Treating an estimate as an order list
The calculator cannot check your site conditions or every detail of the fence design. Have a supplier or installer verify quantities before you buy.
Forgetting gates and layout changes
Include your gates and update the length if you move them or change the fence route. Recheck the post count after any layout revision.
Using a mismatched installed price
A price per foot may not cover the same work or materials as another quote. Compare what each installer includes, not just the estimated total.
The fence formula
Sections = length / spacing; posts = sections + 1 + gates; pickets = length x 12 / (width + gap).
Key terms
- Section
- The span between fence posts. The calculator uses the entered post spacing to estimate the number of sections.
- Post spacing
- The distance between posts along the fence line, entered in feet.
- Picket gap
- The space between neighboring pickets, entered in inches.
- Installed price per foot
- The price per foot you enter to estimate installed fence cost. Confirm what work and materials that price includes.
Fence questions
Why can the section length exceed my fence length?
The calculator rounds a partial section up to a whole section. In the example, 150 ft divided by 8 ft gives 18.75 sections, so the estimate uses 19 sections.
Does the estimate include gate hardware?
The calculator uses the gate count in its post formula, but the supplied results do not specify gate hardware. Check your quote or materials list to confirm whether hardware is included.
Is the concrete quantity exact?
No. The result labels concrete as approximate. Post dimensions and ground conditions can affect the amount needed, so confirm the quantity with your installer or supplier.
Can I use the calculator for a privacy fence?
Yes. Select privacy style. Review the results with a supplier or installer to make sure the planned materials match your design.
Before you act on this result. Cordwell calculators and guides are educational estimates, not legal, tax, investment, lending or other professional advice. They rely on the numbers you enter and on simplified rules, and they can't see your full situation. Before you file, sign, borrow, invest, hire, change your withholding or form a business based on anything here, meet with a licensed contractor, engineer or the local building department who can review your specific facts and confirm the numbers. Rules change, and official agency guidance always controls.