Fence Calculator
How much fencing do you need? Enter your run length for panels, posts, and cost.
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Posts needed—
Rails (3 per section)—
Estimated cost—
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How this calculator works
It divides your fence run by the panel width to get the number of sections, then adds one post per section plus a final end post, and three rails per section.
Worked example — a 100 ft fence with 8 ft sections:
100 ÷ 8 = 13 sections → 14 posts and 39 rails.
Don’t forget gates and corners
Each gate and corner usually needs an extra, heavier post. Add those to the post count above before you buy.
Frequently asked questions
How far apart should fence posts be?
Most wood and vinyl fences use 6–8 ft spacing between posts.
How many posts for a 100 ft fence?
At 8 ft spacing, about 14 posts (sections plus one end post).
Planning an outdoor project
Outdoor quantities vary with site shape, access, drainage, soil conditions, and local material availability. Break irregular areas into simple sections, confirm the product specification with your supplier, and check permits or utility requirements before starting work.
How to use this estimate
- Measure the project in the units shown and recheck your measurements before ordering.
- Use the waste allowance as a planning buffer, not as a substitute for a detailed material takeoff.
- Compare the result with the package yield, coverage, or weight listed by your supplier.
- Prices are user-entered estimates and may change by location, product, delivery, and season.
Accuracy and limitations
Calculapedia provides educational planning estimates. It does not inspect your site, select products, guarantee quantities, or replace a contractor, engineer, architect, building official, or supplier. Confirm the final quantity and any safety or code requirements before buying or building.