Framing Calculator: Studs, Plates & Headers
Total up your wall length, pick 16" or 24" spacing and count corners and openings. The stud count includes the extras a simple "length × 0.75" rule misses: three-stud corners, wall intersections, and the jack and cripple studs at every opening.
How this calculator works
- Layout studs = wall length × 12 ÷ spacing, rounded up, plus one to close the run.
- Extras: 2 studs per outside corner (a three-stud corner) and per T intersection; 2 per door (jack studs, with the layout stud acting as king); 3 per window (jacks plus cripples under the sill).
- Plates = 3 × wall length (one bottom plate and a doubled top plate), bought as 16 ft boards with 5% for splices.
- Waste covers crooked or split boards you will cull from the stack.
Framing questions
How many studs do I need for a wall?
A quick rule is one stud per foot of wall at 16 in on center (it covers the 0.75 per foot layout plus extras). For an exact count: wall length in inches ÷ 16, round up, add one, then add the corner, intersection and opening studs above.
How many studs for a 12 ft wall?
At 16 in on center, 144 ÷ 16 = 9, plus one = 10 layout studs. Add 2 for each end that meets another wall as a corner, and 2 to 3 per opening. A plain 12 ft partition with a door is typically 12 to 14 studs.
How many studs for a 10 ft wall?
At 16 in on center, 120 ÷ 16 = 7.5, so 8, plus one = 9 layout studs before corners and openings.
2×4 or 2×6 walls?
2×4 is standard for interior partitions. 2×6 exterior walls hold R-19 to R-21 batts instead of R-13 to R-15, and are common where energy codes call for more insulation. 2×6 is also used for plumbing walls with 3 in drain pipe.
What does 16 inches on center mean?
The distance from the center of one stud to the center of the next. 16 in layout lines up with 4×8 sheet edges every third stud, which is why it is the US default.