Wood Fence vs Vinyl Fence Material Cost Per Foot
Wood usually costs less per linear foot than vinyl on materials alone. Here is how to build both order lists and compare them fairly.
How Many Rails Do I Need for a 200 Foot Fence?
For a 200 ft fence with 8 ft bays and 2 rails per bay, you need 50 rails. Add one extra rail for a small overage, so order 51.
Calculate rails by bays, not posts
For a 200 foot fence with 8 foot bays and 2 horizontal rails per bay, you need 50 rails. That is 200 divided by 8 equals 25 bays, times 2 rails per bay equals 50 rails. Order 51 rails to allow for a small overage, such as a miscut or a damaged rail. This method works because rails run between posts, so the number of bays determines the rail count, not the number of posts.
A common mistake is to count posts and multiply by rails per post. That overcounts because each rail is shared between two posts. The fence calculator uses bay count to avoid this error. For example, a 200 foot run with posts every 8 feet has 26 posts (including both ends) but only 25 bays. Using 26 posts times 2 rails would give 52 rails, which is two too many. Always base the rail quantity on the number of bays.
Measure the fence line accurately
Start by measuring the total fence length in feet. Use a long tape or a measuring wheel and follow the actual fence line, including any corners. For a straight 200 foot run, the length is 200 feet. If the fence has corners or turns, measure each straight segment separately and add them together. The total length is what you enter into the fence calculator.
Next, confirm your bay width. In the US, the default panel or bay width is 8.00 feet (2.44 m), and post spacing is also 8.00 feet. If your project uses a different spacing, adjust the bay width in the calculator. The number of bays is the total length divided by the bay width. For 200 feet and 8 foot bays, that is 25 bays. If the division does not give a whole number, round up to the next whole bay because you cannot buy a partial bay.
Apply rails per bay and add overage
The standard for this fence style is 2 horizontal rails per bay. Multiply the number of bays by 2 to get the base rail count. For 200 feet, 25 bays times 2 rails equals 50 rails. This is the exact number needed if every bay is built with two rails and there is no waste.
In practice, order a small overage. A common rule is to add 1 extra rail for a 200 foot fence, which gives 51 rails. The overage covers minor mistakes, such as a rail cut too short or a board with a defect. For longer fences, you might add 2 to 3 extra rails, but for 200 feet, one extra is usually enough. The fence calculator can include this overage automatically if you set a waste percentage, but for rails, a simple count of one extra is practical.
Worked example with the calculator
Suppose you enter 200 feet as the fence length, 8.00 feet as the bay width, and 2 rails per bay. The fence calculator first computes the number of bays: 200 ÷ 8 = 25 bays. Then it multiplies by 2 rails per bay: 25 × 2 = 50 rails. If you set a 2% waste factor, it would add 1 rail (50 × 0.02 = 1), giving 51 rails. The calculator also outputs posts, panels or pickets, concrete bags, gates, and a material cost, so you can see the full order list.
For this example, the post count would be 26 posts (25 bays plus 1), assuming posts at both ends. The picket count depends on picket width and gap: with 89 mm pickets and a 13 mm gap, each picket covers 102 mm, so per bay you need about 24 pickets (8 feet = 2438 mm ÷ 102 mm ≈ 23.9, round up to 24). For 25 bays, that is 600 pickets. Concrete bags: each post hole is 254 mm diameter by 762 mm deep, which is about 0.038 m³ per hole. An 80 lb bag yields about 0.017 m³, so you need about 3 bags per hole, or 78 bags for 26 posts. Always confirm with your supplier.
Confirm local requirements before ordering
Before you finalize the rail order, check local building codes and homeowners association rules. In the US, fence height and setback rules vary by municipality, and some areas require permits for fences over a certain height. The default height here is 1.83 m (6.00 ft), but confirm with your local building department. Also, check with your supplier about rail lengths and delivery times, as these can affect your order quantity and schedule.
The fence calculator gives you a solid estimate, but always verify the numbers against your actual site conditions. For example, if your fence includes gates, the gate openings may reduce the number of bays and rails. The calculator accounts for gates if you enter them, but double-check the output. Use the calculator as a planning tool, then confirm material quantities with your lumber yard or fence contractor before purchase.
Frequently asked questions
How many rails do I need for a 200 foot fence with 8 foot bays?
You need 50 rails for a 200 foot fence with 8 foot bays and 2 rails per bay. That is 200 divided by 8 equals 25 bays, times 2 rails per bay equals 50 rails. Order 51 rails to allow for a small overage, such as a miscut or damaged rail.
Should I calculate rails based on posts or bays?
Calculate rails based on bays, not posts. Rails run between posts, so each bay uses a set number of rails. Counting posts and multiplying by rails per post overcounts because each rail is shared between two posts. For a 200 foot fence with 8 foot spacing, there are 25 bays but 26 posts, so using posts would give an incorrect higher count.
How do I account for gates in the rail count?
Gates replace a bay or part of a bay, so they reduce the number of standard bays and rails. Measure each gate opening and subtract its width from the total fence length before dividing by bay width. Then add rails for any gate framing as needed. The fence calculator can include gates if you enter their dimensions, but confirm the output with your gate hardware supplier.
What overage should I add for rails?
For a 200 foot fence, add 1 extra rail as a small overage. This covers minor mistakes like a miscut or a defective board. For longer fences, you might add 2 to 3 extra rails. The fence calculator can apply a waste percentage, but for rails, a simple count of one extra is usually sufficient. Always check your supplier's return policy for unused materials.
Put the numbers in the calculator
Use your own measurements, panel width and post spacing. The tool returns posts, panels, pickets, rails, concrete bags and a material cost.