Fence Material
Estimate posts, rails, pickets, and concrete volume for any fencing project. Free fence material calculator with instant quantity breakdown and charts.
About This Calculator
This free fence material calculator helps homeowners, contractors, and DIY enthusiasts determine the exact quantity of materials needed to build a fence. Whether you are planning a privacy fence, boundary fence, or decorative fence, knowing the precise number of posts, rails, pickets, and concrete volume avoids costly over-ordering or frustrating shortages.
The calculator uses standard fence construction formulas: number of posts = ceil(fence length / post spacing) + 1, with post length set at 1.5 times the fence height to ensure at least one-third of the post is buried. Pickets are calculated by dividing the fence length by the combined picket width and gap. Concrete volume is determined from the post hole volume minus the post volume, accounting for post shape (rectangular or circular).
Regional Notes
India (IN): Typical fence post spacing is 5-8 ft (1.5-2.4 m). Common picket widths range from 4-6 inches with 1-3 inch gaps. Concrete mix ratios of 1:2:4 (cement:sand:aggregate) are standard for post footings.
United States (US): Standard post spacing is 6-8 ft on center. Pressure-treated pine is the most common material. Concrete post footings typically use 60 lb or 80 lb pre-mix bags. Local building codes may require specific post depth based on frost line.
United Kingdom (UK): Typical post spacing is 6 ft (1.8 m). Fence panels are commonly available in 6 ft widths. Concrete post mix in dry bags is widely used for setting posts. Planning permission may be required for fences over 2 m (6.6 ft) in height.
Frequently Asked Questions
How many fence posts do I need?
The number of fence posts depends on your fence length and post spacing. Use the formula: number of posts = ceil(fence length / post spacing) + 1. For example, a 100 ft fence with 8 ft spacing needs ceil(100/8) + 1 = 14 posts. Always round up to the nearest whole number.
How do I calculate the number of fence pickets needed?
To calculate fence pickets, divide the fence length in inches by the sum of picket width and picket gap. The formula is: number of pickets = ceil(fence length / (picket width + picket gap)). For a 100 ft fence with 5.5 inch pickets and 2.5 inch gap, you need ceil(1200 / 8) = 150 pickets.
How much concrete do I need for fence posts?
Concrete volume depends on post dimensions, hole depth, and number of posts. Each hole should be about 6 inches wider than the post. The hole depth is typically half the fence height. Subtract the post volume below ground from the hole volume, then multiply by the number of posts.
What is the standard spacing for fence posts?
Standard fence post spacing is 6 to 8 feet (1.8 to 2.4 meters) in the US and UK. In India, spacing is typically 5 to 8 feet. Closer spacing provides stronger support, especially for tall fences or areas with high wind. Always check local building codes for requirements.
How deep should fence posts be buried?
A general rule is to bury at least one-third to one-half of the total post length in the ground. For a 6 ft fence, use 9 ft posts so 3 ft is buried (one-third rule). Alternatively, the hole depth should be approximately half the fence height for adequate stability.
How many rails do I need for a fence?
The number of rails equals the number of sections multiplied by the rails per section. Sections = number of posts - 1. For a fence with 14 posts (13 sections) and 2 rails per section, you need 13 x 2 = 26 rails. Typical rail counts are 2 for short fences and 3 for taller fences.
Should I buy extra fence material?
Yes, it is recommended to buy about 10% more fencing materials than calculated to account for cuts, mistakes, and future maintenance. This applies to pickets, rails, and concrete. Posts are typically exact since they are placed at specific intervals.