How deep should fence posts be buried?

A general rule is to bury at least 1/3 of the post's total length. For a 6-foot fence, you'd typically use an 8-foot post with 2 feet underground. In cold climates, posts must go below the frost line to prevent heaving.

How many bags of concrete do I need per post?

For a standard 4x4 post in a 10-inch diameter hole, you typically need 1.5 to 2 bags of 50lb fast-setting concrete per post. This varies based on hole depth and width.

Do I need a permit to build a fence?

In many municipalities, yes. You often need a permit for fences over a certain height (usually 6 feet). Always check with your local building department and HOA guidelines before starting.

Should I use pressure-treated wood?

Yes, for any wood touching the ground (like posts), you must use pressure-treated lumber rated for ground contact to prevent rot and termite damage. Cedar or redwood are good options for panels but can be more expensive.

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Fence Calculator

Estimate fence materials and costs for your project.

Calculator

Total Fence Length (feet)

Fence Height (feet)

Panel Width (feet)

Price per Panel ($)

Price per Post ($)

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Reviewed by Mark Johnson, Licensed Contractor | Last Updated: November 2025

Planning Your Fence Project

A fence is a major investment in privacy, security, and curb appeal. Whether you're building a DIY wood fence or installing vinyl panels, accurate material estimation is crucial to staying on budget. This calculator helps you determine the core components needed.

💡 Pro Tip: Call Before You Dig

"Before you dig a single post hole, call 811 (in the US) to have underground utility lines marked. Hitting a gas line or fiber optic cable is dangerous and incredibly expensive. It's a free service, so there's no excuse to skip it."

Common Mistakes to Avoid

Ignoring Property Lines: Building a fence 6 inches onto your neighbor's property can lead to legal battles and being forced to tear it down. Get a survey if you're unsure.
Forgetting Gates: Gates cost significantly more than standard panels and require sturdier posts. Plan their locations early.
Skimping on Concrete: Don't just pour dry concrete in the hole and wet it later. Mix it properly for maximum strength, especially for gate posts.

Frequently Asked Questions

Wood vs. Vinyl Fencing?

Wood offers a natural look and is cheaper upfront but needs staining every 2-3 years. Vinyl is maintenance-free and lasts longer but costs about 50% more initially.

How do I handle slopes?

You have two options: "Racking" (following the ground contour, best for small gaps) or "Stepping" (keeping panels level like stairs, leaving triangular gaps at the bottom).

What about corner posts?

Corner posts take stress from two directions. They should be set deeper and in more concrete than line posts. This calculator includes them in the total post count.