Stud calculator

Vertical studs carry gravity loads from plates and everything above them into the floor or foundation. A straight-wall stud estimate is only one line item in a takeoff, but it is the backbone of layout: miss the count and you freeze the crew or burn the lumber budget.

Sheds, room partitions, and small additions all start with the same question—how many sticks per foot of wall? This page answers that for a single, continuous run with uniform spacing, then layers on plate boards using the stock length you select.

Nominal “2×” widths do not change the OC math: spacing is measured center-to-center, so a 2×4 being about 3½" wide does not break the division step—only layout and squareness on site matter.

Interior non-bearing partitions often land near 16" OC in North American stick framing because drywall and trim tolerate that rhythm well. Exterior and shear walls may jump to 24" OC when the design allows, but engineered shear walls, tall openings, or heavy tile can push you back to 12" OC or require different members entirely.

Local code, manufacturer tables, and your structural drawings win over any web calculator. Use the numbers here to sanity-check a pickup order, not to override stamped plans.

Measure the wall along the bottom plate line (or along the dimension string on plans) in the same unit system you will type into the tool. If the plate steps in and out, break the job into separate runs—this model assumes one continuous length.

When a wall meets another at a T, measure only the segment you are sheathing or boarding on that line; add the “+1 / +2 extra studs” control if you already know you need clip studs beyond the uniform OC count.

16" OC is the default mental model for many residential layouts; 24" OC saves lumber where loads and finishes allow. 12" OC shows up when cabinets, stone, or heavy shelving need more fastening points.

If you are mixing metric and imperial tapes, switch the calculator to meters for the wall length but keep spacing in inches if your crew thinks in OC inches— the tool converts internally to inches for the division.

This site implements the common box-store pattern: take the wall run in inches (after converting feet or meters), divide by on-center spacing, round **up** to whole increments, then add **one** stud to close the far end of that same run. The tool does that division in micro-inches so values like 144" ÷ 16" stay exactly at ten studs instead of drifting in binary floating point.

studs = ceil(wallLength ÷ studSpacing) + 1 + extraFullStudsYouSelected

That “+1” is the terminal stud on the last bay; it is not a secret fudge factor. If your crew snaps lines differently (e.g., starting mid-bay for a door stack), adjust the manual extras instead of fighting the formula.

Only the entered run length matters—there is no separate “height” field because a simple stud tally is per horizontal foot of that run. Long walls with splices or jogged plates should be modeled as multiple passes of this tool.

Outside corners often need three studs worth of meat for drywall outside corners or structural backing; T-walls need stud packs so the intersecting wall has something to nail to. This calculator never auto-inserts those packs—it exposes a simple +1 / +2 stud control so you can mirror what your detail sheets already say.

If you are unsure, walk the plate layout once with a highlighter on the plan: every place two boards meet in the air without a stud behind them is a candidate for an extra stick.

Top and bottom plates are horizontal members that tie studs together. For each continuous horizontal course, take the wall run, divide by the stock length you actually buy (8', 10', or 12'), and round up to whole boards.

This tool multiplies that per-course count by how many layers you select: two top layers mimic the common double top plate after you stack and offset joints; one or two bottom layers cover single- or double-sill situations.

We do not split plates around door rough openings—that shortens real cuts and creates drops you should add manually. Likewise, no automatic 10% waste multiplier is applied; throw a scrap buffer on the truck if your site eats shorts.

If you rip treated bottom plates on a slab, buy treated stock for that course only; the math is the same, the SKU is different.

Full-height studs are what this calculator assumes. Openings introduce cripples under windows, jack studs carrying headers, and king studs running past the opening height to keep the plane straight.

Shear walls may call for different nailing schedules, hold-downs, or structural panels—not modeled here. Treat the stud list as dimensional lumber count only.

When you add doors or windows, you still start from the straight-wall count, then add localized members:

Cripple stud

Short stud filling from a plate down to a window stool or from a header up to the next plate—same thickness as a full stud, different length.

Jack (trimmer) stud

Supports a header under a window or door; height equals rough opening minus header depth. Wide openings sometimes need doubled jacks—check the engineer’s note rather than guessing.

King stud

Runs full height beside the jack, framing the plane of the wall past the opening so drywall and casing have continuous backing.

Header / beam

Spans the opening, transferring roof or floor loads to the jacks; sizing is load-dependent and not covered by this page.

Rough sill

Forms the bottom of a window rough opening; cripples below carry it to the plate when the opening is above grade.