Fence Calculator
Estimate materials and costs for your fence project
Fence Specifications
Measure the entire perimeter you want to fence
Count corners where fence changes direction
Materials & Cost Estimate
When to Use Fence Calculator
Backyard Privacy Fencing
Planning a privacy fence around your yard? Calculate exactly how many posts, rails, and pickets you need for complete coverage. Get accurate material counts before visiting the lumber yard.
Property Line Fencing
Marking your property boundaries with a fence? Enter your lot dimensions to calculate materials for the entire perimeter. Account for corners and gates in your estimate.
Budget Planning
Compare costs between different fence heights and styles before committing. See how a 6-foot privacy fence compares to a 4-foot picket fence in terms of materials and total investment.
Contractor Quote Verification
Got a quote from a fence contractor? Verify their material estimates with your own calculations. Understanding quantities helps you evaluate quotes and negotiate fair pricing.
DIY Fence Projects
Building your own fence? Get a complete materials list including often-forgotten items like concrete for post holes, screws, and post caps. Avoid multiple trips to the hardware store.
Fence Replacement
Replacing an old fence? Measure your existing fence line and calculate materials for the replacement. Compare costs of repairing sections versus complete replacement.
Frequently Asked Questions
How do I calculate fence posts needed?
Divide your total fence length by the post spacing (typically 6-8 feet) and add 1 for the end post. For a 100-foot fence with 8-foot spacing, you need 14 posts (100÷8+1=13.5, rounded up). Don't forget to add extra posts for corners and gates—each gate needs 2 additional posts.
How far apart should fence posts be?
Standard post spacing is 6-8 feet for most fence types. Wood privacy fences typically use 8-foot spacing to match standard lumber lengths. Vinyl fences often use 6-foot spacing. Shorter spacing provides more strength but requires more posts and increases cost. Check your local building codes for requirements.
How many pickets do I need?
Divide your fence length in inches by the picket width. For a privacy fence with no gaps using 5.5-inch pickets, a 100-foot fence needs about 218 pickets (1200÷5.5). For picket fences with gaps, add the gap width to the picket width before dividing. Always add 10% for waste and defects.
How deep should fence posts be set?
Fence posts should be buried at least 1/3 of their total length, with a minimum of 2 feet. For a 6-foot fence using 8-foot posts, bury 2 feet. In areas with frost, posts must extend below the frost line (often 3-4 feet in northern climates) to prevent heaving during freeze-thaw cycles.
How much concrete per fence post?
Each fence post typically needs 1-2 bags of concrete (50-80 lbs each) depending on hole size. A standard 10-inch diameter hole that is 2 feet deep requires about 1.5 bags. Corner posts and gate posts may need larger holes and more concrete for extra stability.
How many rails do I need?
Most fences use 2 horizontal rails (top and bottom) for fences up to 5 feet tall, and 3 rails for 6-foot or taller fences. Multiply the number of fence sections by rails per section. Each section spans between two posts, so a fence with 20 posts has 19 sections.
Do I need a permit for my fence?
Many areas require permits for fences over 6 feet tall or fences in front yards. Some HOAs have additional restrictions on fence style, height, and materials. Check with your local building department and HOA before starting. Property line fences may require neighbor notification.
What type of wood is best for fencing?
Cedar and redwood naturally resist rot and insects, lasting 15-20 years. Pressure-treated pine is more affordable and lasts 10-15 years with proper maintenance. For posts that contact soil, always use ground-contact rated pressure-treated lumber regardless of the fence board material.
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