The standard formula for stud count at 16" OC is: (wall length in feet × 0.75) + 1. At 24" OC it's: (wall length in feet × 0.5) + 1. Then add extra studs for corners, intersections, and openings.
Standard Stud Additions
Each exterior corner: 3 extra studs
Each T-wall intersection: 3 extra studs
Each door: 4 extra studs (2 king + 2 trimmer)
Each window: 4 extra studs plus cripples above and below
Waste factor: Always add 10–15% for cuts and mistakes
16" vs 24" On-Center
16" OC is standard in most residential applications — stronger, better for tile and heavy finishes. 24" OC uses ~30% fewer studs, cutting lumber cost, and is common in energy-efficient construction where insulation fills the cavity.
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