Fence Calculator — Posts, Pickets, Rails & Concrete

At 8-foot post spacing: 100 ÷ 8 = 12.5, round up to 13 spans, plus 1 end post = 14 posts. At 6-foot spacing: 100 ÷ 6 = 16.7 → 18 posts (including both ends). Always add 1 post per gate side.

The standard rule is that post depth equals 1/3 of the total post length, with a minimum of 2 feet and the footing extending below the local frost line. A 6-foot fence post (for a 6-foot privacy fence above grade) should be at least 8 feet total with 2 feet in the ground.

One 60 lb bag of Quikrete (0.45 cu ft yield) is enough for a 6-inch hole at 24 inches deep (≈ 0.39 cu ft). An 8-inch hole at 24 inches requires 2 bags of 60 lb (≈ 0.70 cu ft). An 8-inch hole at 36 inches requires 3 bags. The calculator computes this automatically based on hole diameter and depth.

A standard 3.5-inch cedar privacy picket with a 3/8-inch gap uses one picket per 3.875 inches = about 310 pickets per 100 linear feet. The calculator adjusts for picket width and gap.

Measure the perimeter of the area you want to enclose and subtract gate widths. Most residential lots require 100–300 linear feet for a backyard fence. Use a property survey or measure each side with a measuring wheel or tape for accuracy.