Wall Stud Spacing Calculator
Calculate stud count and exact positions for any wall at 16 or 24-inch spacing.
Returns total studs, linear feet of lumber, and header and footer quantities.
Wall studs are the vertical framing members that form the skeleton of a wall. Their spacing determines structural strength, the ability to fasten drywall or sheathing, and insulation cavity depth.
Stud count formula:
Number of Studs = (Wall Length / Spacing) + 1
The “+1” accounts for the end stud at the far corner. For practical ordering, add 10–15% for blocking, cripple studs above windows, king studs, and jack studs around openings.
Standard spacing options:
| Spacing | Code Name | Typical Use |
|---|---|---|
| 12 inches (305 mm) | 12" O.C. | Heavy loads, tile walls, masonry veneer |
| 16 inches (406 mm) | 16" O.C. | Standard residential framing |
| 19.2 inches (488 mm) | 19.2" O.C. | Engineered lumber optimization |
| 24 inches (610 mm) | 24" O.C. | Advanced framing (energy efficiency) |
O.C. = On Center — measured from the center of one stud to the center of the next.
Worked example:
Wall length: 18 ft (216 inches). Standard 16" O.C. spacing.
Studs = (216 / 16) + 1 = 13.5 + 1 = 14.5 → 15 studs
With 12% waste allowance: 15 × 1.12 ≈ 17 studs to order
Why spacing matters for drywall: Standard drywall sheets are 4 feet (48 inches) wide. At 16" O.C., every drywall edge lands on a stud at 16, 32, and 48 inches — perfect alignment. At 24" O.C., edges land at 24 and 48 inches — still workable but less rigid.
Load-bearing vs. non-load-bearing walls: Load-bearing walls typically require 16" O.C. minimum. Non-load-bearing partition walls can use 24" O.C. to save lumber cost.
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This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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