Wall Framing Calculator
Find studs and plate length for a framed wall.
Default 16 in
Results update as you type.
How it works
Framing a wall starts with knowing how many studs and how much plate lumber you need, and this calculator estimates both from the wall length and stud spacing. You enter the length of the wall and the on-center spacing between studs, commonly 16 or 24 inches, and it returns the stud count and the total plate lumber length. The stud count comes from dividing the wall length by the spacing and adding one for the stud at the far end, so a wall's studs are evenly distributed with the standard spacing. The plate lumber figure covers a bottom plate and a top plate, each running the full length of the wall, which is why it equals twice the wall length; walls with a double top plate need three times the length instead. This gives a solid baseline for ordering lumber, but real framing needs extras: additional studs at corners and wall intersections, king and jack studs plus headers around doors and windows, and blocking. A common rule is to add a few studs per opening and corner. Use this calculator to plan stud walls for homes, garages, partitions, and additions. Enter the wall length and stud spacing to compute the studs and plate lumber.
Studs = ⌈wall length × 12 / spacing⌉ + 1
The number of studs equals the wall length in inches divided by the on-center spacing, rounded up, plus one for the end stud. The plate lumber is twice the wall length, covering a top plate and a bottom plate that run the full length. This is a base count before extra studs for corners, openings, and blocking.
Source:Framing estimation
We review all our tools from time to time to ensure accuracy.
Worked example
How to use this calculator
- 1
Enter your values
Enter wall length.
- 2
Adjust the options
Adjust stud spacing (on center) if they apply — sensible defaults are already set.
- 3
Read your result
Studs needed updates instantly as you type — no button to press.
Frequently asked questions
How many studs do I need for a wall?
Divide the wall length in inches by the stud spacing, round up, and add one for the end stud. A 16-foot wall at 16-inch spacing needs 13 studs. This is the base count; add extra studs for corners, wall intersections, and framing around doors and windows, which the calculator does not include automatically.
What stud spacing should I use?
Sixteen inches on center is the most common spacing for load-bearing walls and is required in many situations, while 24 inches on center is used for some non-load-bearing or advanced-framing walls to save lumber. Check your local building code and the load the wall carries, then enter the correct spacing to get an accurate stud count.
Why is the plate lumber twice the wall length?
A framed wall has a bottom plate and a top plate, each a continuous piece running the full length of the wall, so the plate lumber equals two times the wall length. If your wall uses a double top plate, common in load-bearing walls, you will need three times the wall length instead of two.
Does this account for doors and windows?
No, this is a base stud count for a solid wall. Openings need extra framing: king studs, jack or trimmer studs, a header, and cripple studs above and below. As a rough guide, add two to four extra studs per opening and two to three per corner. Adjust your order upward accordingly.
What length studs do I need?
Stud length depends on your ceiling height and the plate configuration. Precut studs are sized so that, with a bottom plate and double top plate, they produce a standard 8-, 9-, or 10-foot ceiling. Measure from the subfloor to the desired ceiling height and subtract the plate thicknesses to find the required stud length.