How many studs do I need for a wall?

Take the wall length in inches, divide by the spacing (16 or 24), round up to a whole stud, and add one for the end. A 20 foot wall at 16 inches on-center is 240 ÷ 16 = 15, plus 1, which is 16 field studs. Then add about 3 studs per corner and 4 to 6 per door or window, and 10 percent for waste. This calculator does all of it.

How do I calculate the number of studs?

Studs equal the wall length in inches divided by the on-center spacing, rounded up, plus one end stud. Round the division up first, then add the one, or you will come up a stud short. That works out to about 0.75 studs per foot at 16 inch spacing and 0.5 per foot at 24 inch, before you add the corner and opening framing.

How many studs do I need for a 20 foot wall?

A 20 foot wall at 16 inches on-center needs 16 field studs: 240 inches divided by 16 is 15, plus one end stud. At 24 inch spacing it is 11. Then add the framing for any corners (3 studs each), intersections (2 each), and openings (about 4 per door, 6 per window), plus roughly 10 percent for waste. A plain 20 foot wall with a door and a window comes to about 29 studs.

What is the standard stud spacing?

16 inches on-center is the standard for load-bearing walls, and it lands panel edges on studs at 16, 32, and 48 inches to match 4×8 sheathing and drywall. 24 inches on-center is allowed for many single-story or top-story walls within height limits, and it pairs with 2×6 studs for deeper insulation. Going from 16 to 24 inch spacing cuts the stud count by about a third.

How many studs are in a linear foot of wall?

About 0.75 studs per linear foot at 16 inches on-center (one every 1.33 feet), and 0.5 per foot at 24 inches on-center (one every 2 feet), before the end stud and the corner and opening framing. So a 40 foot wall has roughly 30 field studs at 16 inch spacing or 20 at 24 inch, plus one to close the end.

How is a door or window framed?

Each side of the opening gets a king stud that runs full height and a jack (trimmer) stud that stops under the header and carries its load down to the bottom plate, so 4 studs per opening. A window also gets a rough sill between the jacks and cripple studs below it, and both doors and windows get a header across the top. That is why the calculator adds about 4 studs for a door and 6 for a window.

How much plate lumber does a wall need?

A standard wall has one bottom (sole) plate and a doubled top plate, so the plate stock is 3 times the wall length. A 20 foot wall needs 60 linear feet of plate. Plates are the same 2× lumber as the studs, a 2×4 wall gets 2×4 plates. An advanced wall with a single top plate uses 2 times the length instead, where the code allows it.

Why is a precut stud only 92-5/8 inches?

A precut stud is sized so that the stud plus its plates equals the framed wall height. For an 8 foot wall, the 92-5/8 inch stud plus one bottom plate and a double top plate (4-1/2 inches of plate) gives 97-1/8 inches, which sits just above two stacked 4 foot drywall sheets so the sheets never need trimming. 9 foot walls use 104-5/8 inch studs and 10 foot walls 116-5/8 inch.

How do I calculate board feet?

Board feet equal the nominal thickness in inches times the nominal width in inches times the length in feet, divided by 12. It uses nominal sizes, so a 2×4 counts as 2 by 4 even though it measures 1-1/2 by 3-1/2. A 2×4×8 is (2 × 4 × 8) ÷ 12 = 5.33 board feet, and a 2×6×8 is 8 board feet. Lumber is often priced per board foot for a bulk order.

How many extra studs does a corner need?

A traditional corner uses 3 studs: two form the L and a third backs the drywall on the inside. An advanced-framing corner uses 2 studs with drywall clips or a nailer strip, which saves a stud and leaves the cavity open for insulation. A wall or partition intersection adds about 2 studs for backing. These are common framing conventions, not code requirements.

How much does a framing stud cost?

A 2×4×8 runs about $3 to $6 and a 2×6×8 about $6 to $9 in 2026, but lumber is one of the most volatile building materials and swings with the wholesale market and the region. Installed whole-house framing, walls, floors, and roof with labor, runs about $7 to $16 per square foot of floor. Always confirm a live local price before you bid.

How much waste should I add for framing?

Add about 10 to 15 percent to framing lumber for cutoffs, crowned or defective boards, and blocking. Use 10 percent for a simple wall and 15 percent for a wall with lots of openings, angles, or short pieces. Advanced framing uses fewer pieces, so the same percentage sits on a smaller base. Buy a few extra studs for mistakes.

Is this framing calculator free?

Yes. It is free, needs no signup, and runs entirely in your browser. Nothing you enter is uploaded anywhere.

Can it count studs off my plan?

No. This calculator works from a wall length and openings you type in. To take the wall lengths and openings straight off a PDF plan to scale, so your stud, plate, and board-foot counts come from the drawing, use Easy Takeoffs, the construction takeoff software built to measure off plans. 14-day trial, no card.

All calculators

Framing

Framing Calculator

Enter a wall length, height, and stud spacing, add its doors and windows, and get the framing lumber list: studs, plates, headers, and board feet, plus a 2026 cost. It works for 2×4 and 2×6 walls at 16 or 24 inch spacing, and it is free to use with no signup.

Wall length (ft)

Wall height (ft)

Stud size

Spacing

16″ on-center is the load-bearing standard; 24″ is allowed for many single-story walls and pairs with 2×6 for deeper insulation.

Doors

Windows

Each opening adds king and jack studs (a window also adds a sill and cripples) plus a header. Header size is set by the span and load on your plans.

Waste allowance

10% for a straightforward wall, 15% for lots of openings, angles, and blocking.

Illustration, not to scale

Studs (with 10% waste)

29studsof 2×4

16 field + 10 openings + 10% waste.

Studs29 studs2×4 at 16″ o.c.

Plates60 ft1 bottom + double top plate

Headersest.2 headersone per opening, size per plans

Board feet196.5 bf2×4 lumber, studs + plates

Stud length8 ft92-5/8″ precut

A conventional platform-framing count to price and order from. Header size, jack-stud count, and load-bearing details come from your plans and the code, not this estimate. Blocking, sheathing, and fasteners are separate.

You counted one wall by hand?

Measure every wall run off your plan instead. Easy Takeoffs takes off wall length and height straight from the PDF to scale, so your stud, plate, and board-foot counts come from the drawing. 14-day trial, no card.

Measure my wall runs

14-day free trialNo credit cardCancel anytime

Cost

How much does framing lumber cost?

Framing lumber runs about $3 to $6 for a 2×4×8 stud and $6 to $9 for a 2×6×8 in 2026, or roughly $0.45 to $0.65 a linear foot for a 2×4. By the board foot it is about $0.65 to $0.95. Installed framing for a whole house, walls, floors, and roof with labor, runs $7 to $16 per square foot of floor. Lumber prices are volatile and regional, so get a live local quote before you bid.

What framing lumber costs (2026 US)

Item	Typical cost
2×4×8 stud (SPF #2, precut)	$3 to $6 each
2×6×8 stud	$6 to $9 each
2×4, per linear foot	$0.45 to $0.65
2×6, per linear foot	$0.80 to $1.15
Framing lumber, per board foot	$0.65 to $0.95
Installed framing (whole house)	$7 to $16 per sq ft of floor

2026 US figures from Home Depot and Lowe's listings, BuildEstimatory, and HomeAdvisor. Lumber is one of the most volatile building materials, tracking a wholesale composite that ran roughly $400 to $900 per thousand board feet across 2025 and 2026, so confirm a live local price. The installed figure is whole-structure framing with labor, not a single wall.

What the studs cost for a wall (2×4 at 16 in o.c., 2026)

Wall (8 ft)	Studs	Stud cost
10 ft	10	$35 to $50
20 ft	18	$63 to $90
30 ft	27	$95 to $135
40 ft	35	$123 to $175

Studs only, for a straight 8 ft 2×4 wall at 16 inch spacing with 10 percent waste and no openings, at $3.50 to $5.00 a stud. Add corner and opening framing, plates, and headers on top. Switch to 24 inch spacing above and the count drops by about a third.

Framing

What lumber does a framed wall need?

A framed wall is more than studs. It has a bottom plate and a doubled top plate running its full length, a stud every 16 or 24 inches, extra studs bunched at the corners and intersections, and around each door and window a pair of king studs, a pair of jack studs, and a header. The calculator counts each piece and totals the board feet.

How a wall is framed

Part	What it is	Count
Studs	Vertical members	1 every 16 or 24 in, + 1 end
Bottom plate	Sole plate on the floor	1 × wall length
Top plate	Doubled on bearing walls	2 × wall length
King studs	Full-height at each opening	2 per opening
Jack studs	Carry the header	2 per opening (more for wide spans)
Header	Beam over an opening	1 per opening, sized by span

King and jack studs are the guaranteed 4 studs a takeoff adds per opening; a window adds a sill and cripple studs on top. Jack count is a minimum of two and grows with the span and load. Header size is set by the clear span and the load above, per IRC Table R602.7, so confirm it on the plans.

Measure

How do you measure a wall for framing?

You measure a wall for framing by its length, its height, and its openings. The length and spacing give the field studs, the height sets the stud stock length, and each door, window, corner, and intersection adds its own framing. Add them up, add waste, and that is the lumber list.

1
Measure the wall length and height in feet, and note the stud spacing, 16 or 24 inches on-center.
2
Multiply the length by 12, divide by the spacing, round up, and add one for the end stud.
3
Add 3 studs per corner, 2 per intersection, and about 4 studs per door and 6 per window, plus a header for each opening.
4
Add plates at 3 times the wall length for a double top plate, then add 10 to 15 percent for waste.

Counting studs wall by wall across a whole plan is slow and easy to get wrong. For a bid-ready number, take the wall lengths and openings off the plan to scale, which is what construction takeoff software does.

Formula

How do you calculate studs for a wall?

Count the studs from the wall length and spacing: take the length in inches, divide by the spacing, round up, and add one for the end stud. Then add the corner and opening framing, about three studs per corner and four to six per door or window. The plates run three times the wall length. Here is the exact math, with a worked example.

Field studs: wall length in inches ÷ spacing (16 or 24), rounded up, + 1 for the end stud
Corners: + 3 studs per corner (2 for an advanced corner), + 2 per wall intersection
Openings: + 4 studs per door and about 6 per window, plus one header each
Plates: wall length × 3 for a double top plate (1 bottom + 2 top), or × 2 for a single
Board feet: nominal thickness × width × length ÷ 12 (a 2×4×8 is 5.33 board feet)

Ordering adjustments

Studs come in stock lengths, so an 8 foot wall uses a 92-5/8 inch precut stud (the stud plus three plates equals the framed height). Add 10 to 15 percent for cutoffs, defects, and blocking. Plates round up to stock lengths and overlap at corners, so buy a little past the bare three-times figure. Every opening in a load-bearing wall needs a header, but its size comes from the span and the load above, per the plans, not from a rule of thumb.

Worked example

A 20 ft wall, 8 ft high, 2×4 at 16 in o.c., with one door and one window, 10% waste

Field studs: 240 in ÷ 16 = 15, + 1 end stud = 16
Openings: 4 studs for the door + 6 for the window = 10
Total studs: (16 + 10) × 1.10 waste = 29
Plates: 20 × 3 (double top plate) = 60 linear feet
Headers: one for the door, one for the window = 2

Result: About 29 studs of 2×4, 60 linear feet of plate, and 2 headers, roughly 197 board feet of lumber. An 8 foot wall uses 92-5/8 inch precut studs.

Reference

Framing reference tables

Studs for a straight wall (8 ft, no openings)

Wall length	16 in o.c.	24 in o.c.
8 ft	8	6
12 ft	11	8
16 ft	15	10
20 ft	18	13
24 ft	21	15
32 ft	28	19

Studs for a straight 8 ft wall with 10 percent waste and no openings, exactly as the calculator computes: length × 12 ÷ spacing, rounded up, + 1, then + 10 percent. Add corner and opening framing separately. The 24 inch spacing cuts the field studs by about a third.

Board feet in common framing lumber

Size	Length	Board feet
2×4	8 ft	5.33
2×4	10 ft	6.67
2×4	12 ft	8.00
2×6	8 ft	8.00
2×6	10 ft	10.00
2×6	12 ft	12.00

Board feet use nominal sizes: nominal thickness × width × length ÷ 12. A 2×4×8 is (2 × 4 × 8) ÷ 12 = 5.33 board feet. Lumber is often priced per board foot for bulk orders and per piece at the store.

Extra framing by feature

Feature	Studs added
90-degree corner (traditional)	+ 3 studs
90-degree corner (advanced)	+ 2 studs
Wall or partition intersection	+ 2 studs
Door	+ 4 studs and 1 header
Window	+ 6 studs and 1 header

Added on top of the field studs. The door and window figures are the king and jack studs (a window also adds a sill and cripples); every opening needs a header sized to its span. These are estimating conventions, not code quantities, so reconcile against the plans.

Precut stud lengths

Wall height	Precut stud
8 ft	92-5/8 in
9 ft	104-5/8 in
10 ft	116-5/8 in

A precut stud runs about 3-3/8 inches shorter than the nominal wall height. With its three plates (1 bottom + 2 top = 4-1/2 inches) it frames an 8 foot wall to 97-1/8 inches, just above two stacked 4 foot drywall sheets so nothing needs trimming. A 2×4 and a 2×6 wall use the same lengths.

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