Framing Calculator
Calculate wall framing lumber — total studs and top/bottom plate feet — for multiple walls from wall length, stud spacing, and plate count.
How this calculator works
Studs are spaced evenly along each wall with a framing allowance for corners and openings, and plates run the wall length several times over. The calculator totals both across all your walls.
Formula: Studs per wall = ⌊(wall length in ÷ spacing)⌋ + 1. Total studs = studs per wall × walls × 1.15 (rounded up). Plate feet = wall length × plates × walls.
Worked example
Four 20 ft walls, 16-inch spacing, three plate rows:
- Studs per wall: ⌊(240 ÷ 16)⌋ + 1 = 16 studs
- Total with 15% for corners/openings: ⌈16 × 4 × 1.15⌉ = 74 studs
- Plate lumber: 20 × 3 × 4 = 240 linear feet
Reference (16 in OC, 3 plates)
| Walls (20 ft each) | Total studs | Plate feet |
|---|---|---|
| 1 wall | 19 | 60 |
| 4 walls | 74 | 240 |
| 8 walls | 148 | 480 |
How to measure
Measure each wall’s length along the plate line and count how many walls share that length. Feed the wall totals into the Drywall Calculator to sheet the framing, and the Board Foot Calculator to price the lumber.
Framing is structural. Verify stud size, spacing, and headers against local code.
Frequently asked questions
What does this framing calculator estimate?
It gives the stud and plate lumber for a set of walls at once: total studs including a 15% allowance for corners and openings, and the linear feet of plate stock. Enter one wall length and the number of identical walls, or run it per wall for a room with different sizes.
16 or 24 inch stud spacing?
16 inches on center is standard for load-bearing walls and pairs with 4-foot sheet goods. 24 inches on center is allowed for many non-load-bearing and single-story walls and saves lumber. Match the spacing to your plan and load.
Why add 15% to the stud count?
Evenly spaced studs are only the base. Real walls need extra studs at corners, wall intersections, and around every door and window — king studs, jack studs, cripples, and headers. The 15% allowance covers a typical wall; many openings push it higher.
How is plate lumber counted?
Plates run horizontally along the wall. A standard wall has three plate rows — one bottom plate plus a doubled top plate — so plate lumber is the wall length times three, times the number of walls.
Does this include headers and blocking?
No — headers over openings and fire blocking are separate and depend on your opening sizes. Size headers from a span table, and add blocking where your code requires it.
Estimates only. Verify quantities with your supplier before purchasing.