Lumber & Framing Calculator

Plan a stud-wall framing job in seconds. Enter wall length, stud spacing, and number of walls to see how many studs and linear feet of plate you'll need. Includes a board feet converter for pricing dimensional lumber accurately.

How This Calculator Works

The wall framing side counts studs at your on-center spacing. It converts wall length to inches, divides by the spacing (16 in is standard, 24 in for advanced framing), rounds up, and adds one stud to close the far end. That count is per wall, multiplied by the number of identical walls. If you include plates, it figures three plate runs — one bottom plate and a doubled top plate — across each wall's length, totals the linear feet, and divides by 8 to get the number of 8-ft plate boards.

The board-foot tool answers a different question: how much you are actually paying for. A board foot is thickness × width × length (in feet) divided by 12, equal to 144 cubic inches of wood. Multiply by quantity for the order total and by your price per board foot for cost. That is how hardwood and rough lumber are priced, as opposed to the each-stick pricing on dimensional studs.

A Worked Example

Frame one 24 ft wall at 16 in on center with plates. Wall length in inches: 24 × 12 = 288. Divide by 16 = 18, add one = 19 studs. Plates: 24 ft × 3 runs = 72 linear feet, divided by 8 = 9 plate boards. That is 28 pieces for the wall. For board feet, a 2×8×12 actually measures 2 × 8 × 12 ÷ 12 = 16 board feet each; ten of them is 160 board feet, and at a 2026 price near $2.40/bf that is about $384.

Estimator's tip: Buy your plates in the longest lengths you can handle so the top plate laps stagger over the studs — chopping every plate from 8-footers leaves weak joints stacked over the same bays. Remember the calculator counts straight field studs only; sketch your openings first and add a king and jack stud per side of each door and window, plus blocking for backing, before you place the order.

What Affects Your Stud Count

• Stud spacing — 24-inch on center uses noticeably fewer studs than 16-inch.
• Number of openings, corners, and T-intersections, which add king studs, jacks, and blocking beyond the base count.
• Whether you include the bottom and doubled top plates in the order.
• Plate board length: ordering 16-ft plates instead of 8-ft reduces end joints.
• For board feet, the nominal versus actual size — a 2×4 is really 1.5×3.5 once surfaced.
• Species and grade, which drive the price-per-board-foot more than dimensions do.

Frequently Asked Questions

How many studs do I need for a wall?

Divide the wall length in inches by your spacing (16 or 24), round up, and add one for the end stud. A 16-foot wall at 16 inches on center needs 13 studs before openings and corners.

What is a board foot?

A board foot is 144 cubic inches of lumber: thickness times width in inches times length in feet, divided by 12. A 2x6x10 board equals 10 board feet. Rough and hardwood lumber are priced this way.

How many studs for 16 vs 24 inch spacing?

On a 12-foot wall, 16-inch spacing needs about 10 studs while 24-inch spacing needs about 7. The wider spacing saves lumber but requires thicker sheathing and is limited by code in some load cases.

Do I need to add studs for corners and openings?

Yes. The base count covers the straight field studs. Add king and jack studs at each door and window, plus extra studs for corners and wall intersections, typically two to four more per opening or corner.