How many studs for a 20-foot wall?
Quick Answer
A 20-foot wall framed at 16-inch centers needs 16 studs plus 3 plates (bottom plate, top plate, double top plate). At 24-inch centers, the same wall needs 11 studs. These counts don't include extra studs for door or window openings — add 5 studs per door and 4 per window.
Quick Reference Table
| Spacing | Studs + plates for 20-foot wall |
|---|---|
| 16" OC | 16 studs + 3 plates |
| 24" OC | 11 studs + 3 plates |
| 12" OC | 21 studs + 3 plates |
| Add door | +5 studs |
| Add window | +4 studs |
How to Calculate It Yourself
- 1
Divide wall length by spacing: 20 ft = 240 inches. 240 ÷ 16 = 15 spaces.
- 2
Add 1 end stud: 15 + 1 = 16 studs.
- 3
Add 3 plates (bottom + top + double top plate): each 20 ft long.
- 4
Add opening studs: per door — 2 king studs + 2 jack studs + cripples ≈ 5 extra. Per window — 4 extra studs.
Pro Tip
The quick formula: (wall length in feet × 0.75) + 1 = studs at 16" OC. For 20 ft: (20 × 0.75) + 1 = 16 studs. Add 10% for waste and always buy in multiples of a unit if your yard bundles them.
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