Fence Post Calculator — How Many Fence Posts Do I Need?

Fence Post Calculator — How Many Fence Posts Do I Need?

Free Fence Post Calculator. Enter total fence length and post spacing to calculate exactly how many posts you need.

📏 Fence Post Calculator

💡 Pro Tip

In cold climates, set posts below the frost line to prevent heaving. Always use concrete to secure posts — it prevents leaning and extends post life significantly.

Frequently Asked Questions

Q: How do I calculate fence posts?

Number of posts = (Fence Length ÷ Post Spacing) + 1. For a 100-foot fence with 8-foot spacing, you need 100÷8 + 1 = 13.5 → 14 posts.

Q: How deep should fence posts be set?

As a general rule, set fence posts 1/3 of their total length underground. An 8-foot post should be 2.5–3 feet deep in the ground.

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