How the count works

Place regular stud centers from the left wall end at the chosen spacing and add the right end if it is not already on the grid. A rough opening replaces every regular grid position on or inside its measured edges. The example opening detail adds one king and one jack on each side, then one short cripple at each replaced grid position above the opening; a window adds the same number below its sill. This is an editable quantity model for one straight wall, not an engineered framing plan.

For a plain 12 ft wall at 16 in on center: 144 ÷ 16 = 9 spaces, so 10 regular studs. With two top plates and one bottom plate, each 12 ft run needs two 8 ft boards, or 6 plate boards. An 8 ft wall with three 1½ in plate layers needs full-height cuts of 91½ in, which fit 8 ft stock. A 3 ft door from 48 to 84 in replaces the 48, 64 and 80 in grid positions: 7 regular + 2 king + 2 jack + 3 upper cripples = 14 stud pieces. Header lumber is excluded because its section and bearing depend on the approved design.

The U.S. Department of Energy Building Science Education describes one pair of king studs, one pair of jack studs and only needed cripples as an advanced-framing example. Actual wall loads, header, bracing, fastening, plate splices and local code may require different details. For gypsum board ordering after framing, use the drywall planner.