Wall Stud Calculator
Calculate studs and plates for wall framing. Enter values for instant results with step-by-step formulas.
Formula
Studs = (Wall Length / Spacing) + 1 + extras
Divide wall length by stud spacing, add extras for corners, openings, and blocking.
Worked Examples
Example 1: Simple Wall
Problem:20 ft wall, 8 ft tall, 16\" stud spacing, no openings.
Solution:Studs:\n(20 x 12) / 16 + 1 = 16 studs\nAdd 2 for corners = 18 studs\n\nPlates:\n20 ft x 3 (bottom + 2 top) = 60 ft\nBoards: 60 / 10 = 6 boards (2x4x10)\n\nStud length: 8 ft (92-5/8\" precut)
Result:18 studs (2x4x8) + 6 plates (2x4x10)
Example 2: Wall with Door
Problem:12 ft wall, 8 ft tall, one 3-ft door, 16\" spacing.
Solution:Studs: (144 / 16) + 1 = 10\nCorners: +2\nDoor framing: +4 (2 kings, 2 jacks)\nTotal: 16 studs\n\nPlates: 12 x 3 = 36 ft = 4 boards\n\nHeader (2x8 x 4 ft): 1 piece
Result:16 studs, 4 plates, 1 2x8x4 header
Example 3: Room Perimeter
Problem:Room 12x16 ft, 8 ft walls, 2 doors (3 ft), 3 windows (4 ft), 24\" spacing.
Solution:Perimeter: 2(12+16) = 56 ft\n\nStuds at 24\" O.C.:\n(56 x 12) / 24 + 1 = 29\nCorners: +8 (4 corners)\nDoors: +8 (2 doors x 4)\nWindows: +12 (3 windows x 4)\nTotal: 57 studs\n\nPlates: 56 x 3 = 168 ft = 17 boards
Result:57 studs, 17 plate boards, headers
Frequently Asked Questions
What is stud spacing?
Standard spacing is 16\" or 24\" on-center (O.C. - measured from center to center). 16\" O.C. is standard for load-bearing walls, better for hanging drywall/cabinets. 24\" O.C. saves lumber but requires stronger studs and may limit drywall screwing points.
How much does wall framing lumber cost?
2x4x8 stud: $3-8 each (varies with markets). 2x6x8: $5-12. 2x4x10 for plates: $4-10. 2x10 header material: $12-25. Prices fluctuate significantly - recent years saw 200-300% swings. Buy when prices moderate if possible.