Stud Calculator
Enter your wall's length, stud spacing, and number of openings (doors and windows) to calculate how many studs you need for framing.
How the Stud formula works
Base stud count from spacing, plus extra for openings:
Base studs = ceil(Wall length × 12 / Spacing) + 1 Total studs = Base studs + (Openings × 2)
Each opening typically needs extra studs on both sides for the rough framing (king and jack studs), commonly approximated as 2 extra studs per opening for a rough estimate.
Step-by-step calculation
- Convert wall length to inches and divide by stud spacing (commonly 16 or 24 inches on-center), rounding up.
- Add 1 for the starting stud.
- Add roughly 2 extra studs for each door or window opening to account for the additional framing around it.
Worked example
A 20 ft wall with 16-inch spacing and 2 window openings: Base studs = ceil(20×12/16)+1 = 16. Total = 16 + (2×2) = 20 studs.
Frequently asked questions
What's standard stud spacing?
16 inches on-center is the most common spacing for residential wall framing, though 24-inch spacing is sometimes used with certain construction methods to reduce material costs.
Does this account for corner framing?
This gives a base estimate; corners typically need additional studs (often 2-3 extra per corner) for proper nailing surfaces, which isn't included in this simplified count — add those separately for a complete order.