What is the Fence Calculator?
Estimate fence posts, rails and pickets for a straight fence run. Order the right amount the first time. These construction and DIY calculators estimate materials for common home projects and include sensible waste allowances.
How to use the Fence Calculator
- Enter your fence length, your post spacing, your rails per section, your picket width and the remaining fields.
- Results update automatically as you type; you can also press Calculate.
- Read the output: posts, rails, pickets.
- Use the 📊 chart to see the result visually, then copy or share it.
Formula and method
Worked example
With fence length = 100 ft, post spacing = 8 ft, rails per section = 2, picket width = 5.5 in, gap between pickets = 0.5 in, the Fence Calculator returns posts: 14; rails: 26; pickets: 200.
Tips for better results
- Add 5–15% for waste, cuts and breakage depending on the material.
- Measure twice and round up when buying — returns are easier than second trips.
- Coverage figures vary by product, so check the label or spec sheet.
⚠️ Material estimates are approximate. Follow local building codes and manufacturer instructions.
Frequently asked questions
What does the Fence Calculator do?
Estimate fence posts, rails and pickets for a straight fence run.
How is it calculated?
The Fence Calculator uses this method: Posts = length ÷ spacing + 1; Pickets = length ÷ (picket + gap).
Can you show an example?
With fence length = 100 ft, post spacing = 8 ft, rails per section = 2, picket width = 5.5 in, gap between pickets = 0.5 in, the Fence Calculator returns posts: 14; rails: 26; pickets: 200.
Is the Fence Calculator accurate?
It uses standard published formulas and is tested against known values, but results are estimates for guidance. Material estimates are approximate. Follow local building codes and manufacturer instructions.
Is this tool free and private?
Yes — the Fence Calculator is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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