What is the Fence Picket Spacing Calculator?
The Fence Picket Spacing Calculator is a time-saving tool for carpenters, landscapers, and homeowners. It calculates exactly how many wooden pickets you need for a section of fence and the exact millimeter gap required between them to ensure perfect symmetry across the entire yard.
How to Calculate Fence Picket Gaps (Formulas)
Calculating the gap requires the total length of the fence run and the physical width of the pickets. The formula changes depending on whether you want a gap on the very edges next to the posts, or if you want the first and last picket to be perfectly flush against the posts.
- Gap on Ends Strategy: You will have one more gap than the total number of pickets.
- Exact Gap: [Total Fence Length - (Number of Pickets * Picket Width)] / (Number of Pickets + 1)
- Flush on Ends Strategy: You will have one less gap than the total number of pickets.
- Exact Gap: [Total Fence Length - (Number of Pickets * Picket Width)] / (Number of Pickets - 1)
Frequently Asked Questions
How much space should be between privacy fence pickets?
For a true privacy fence, pickets are typically installed "butt-jointed" (touching edge-to-edge). However, wooden pickets will shrink as they dry, naturally creating a 1/8-inch to 1/4-inch gap over time. If you want absolute zero-visibility privacy, you must build a "board-on-board" (shadowbox) overlapping fence.
What is the standard gap for a picket fence?
For a classic semi-private or decorative picket fence, the standard gap is usually equal to half the width of the picket. For example, if you are using 3.5-inch wide pickets, a 1.75-inch gap provides a classic, aesthetically pleasing proportion.
Why does my 4-inch picket only measure 3.5 inches?
Lumber is sold by its "nominal" size (the size before it was dried and planed smooth). A 1x4 picket is nominally 4 inches wide, but its actual, physical dimension is 3.5 inches. Always measure your physical lumber before calculating spacing!
What is the standard distance between fence posts?
For a typical wooden privacy or picket fence, the standard distance between posts is 6 to 8 feet (1.8 to 2.4 meters). Using 8-foot sections is very common because most lumber rails are sold in 8-foot lengths. Always check your local building codes and wind-load requirements before setting your posts.
How many pickets do I need for an 8-foot fence section?
It depends on the width of your pickets and your desired gap. For example, if you use standard 3.5-inch pickets with a 1.5-inch gap, you will need exactly 19 pickets for an 8-foot (96-inch) section with a 1.55-inch true gap. Use our calculator above to determine the exact number of materials you'll need to buy.