How many studs do I need per linear foot?

At 16 inches on center: approximately 0.75 studs per linear foot of wall. At 24 inches on center: approximately 0.5 studs per linear foot. Multiply your wall length in feet by 0.75 (for 16 OC) or 0.5 (for 24 OC), then add 1 for the end stud.

What is the standard stud spacing for a wall?

Standard residential wall framing uses 16 inches on center (16 OC). This is required for load-bearing walls. 24 inches on center (24 OC) is used for non-load-bearing partition walls to reduce material cost.

How many studs does a 10-foot wall need at 16 OC?

A 10-foot wall at 16 inches on center needs approximately 9 studs: (10 × 12 ÷ 16) + 1 = 8.5, rounded up to 9. Add corner studs and king/jack studs for any openings.

How many studs do I need for a 12x12 room?

A 12×12 room has a total perimeter of 48 linear feet. At 16 OC: approximately 40 studs + 4 corner studs = 44 studs to order (with 10% waste). At 24 OC: approximately 31 studs to order.

What is the difference between wood studs and metal studs?

Wood studs (2×4 or 2×6) are used for structural load-bearing walls and exterior framing. Metal (steel) studs are lighter, straighter, and non-combustible — ideal for interior partition walls and commercial construction.

How do you calculate metal studs needed?

Metal stud count = (Wall Length ft × 12 ÷ Spacing in) + 1. Also order track for top and bottom plates: Track = 2 × total wall linear footage. Add 10% waste.

Stud Calculator — Wall Framing, Stud Count, Spacing & Material Estimator

🏗️ Free Construction Tool

Stud Calculator — Wall Framing, Count & Spacing

Calculate how many studs you need for any wall, room, shed, or framing project. Supports wood & metal studs, 16 OC & 24 OC spacing, doors, windows, and gable walls — free and instant.

✅ Stud count calculator 📐 16 OC & 24 OC 🚪 Doors & windows 🪵 Wood & metal studs 🏗️ Room & shed mode

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Wall Stud Calculator

Stud count, spacing, plates & material estimate

Project & Material

Dimensions & Spacing

Calculate

What are you framing?

Pick a project type — this sets the right defaults for wall count, corners, and depth.

Stud material

Stud size

Wall dimensions

Enter the length and height of your wall.

Wall Length REQUIRED

Wall Height OPTIONAL

Used for plates — defaults to 8 ft

Stud spacing

Enter dimensions above to see a live estimate.

Openings & options

Everything below is optional — skip any section you don't need.

🚪 Doors

+2 king + 2 jack studs each

🪟 Windows

+2 king + 2 jack + cripple studs

📐 Corners

+1–3 studs per corner

Price per stud

$ per stud

Leave blank to skip cost estimate

Total Studs Required (incl. 10% waste)

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Standard studs + corner, door & window extras

Standard Studs

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Extra Studs

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Wall Length

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Spacing

—

Plates (lin ft)

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Est. Cost

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📊 Stud Breakdown

Item	Qty	Notes

⚠️ Estimates include a 10% waste allowance. Verify quantities with your framing plan. Local codes may require different spacings.

How to Calculate the Number of Studs for a Wall

Calculating studs is one of the first steps in any framing project. The core formula is straightforward, but getting the count right means accounting for spacing, corners, openings, and waste — all handled automatically by the stud calculator above.

Standard Stud Count Formula:
Studs = (Wall Length ft × 12 ÷ Spacing in) + 1

At 16″ OC: Studs = (Length × 0.75) + 1
At 24″ OC: Studs = (Length × 0.5) + 1

Add: +1 per corner · +4 per door · +4 per window · +10% waste

The "+1" accounts for the end stud every wall requires. Corners add at least one extra stud. Doors and windows need king studs and jack studs on each side of the opening.

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Standard Studs

Regular vertical members spaced evenly at your chosen on-center spacing. Drywall sheets are 48″ wide — both 16 and 24 OC divide evenly into 48, so sheets always land on a stud.

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King & Jack Studs

Every door or window needs 2 full-height king studs and 2 shorter jack studs to support the header. These are not interchangeable with regular studs — always add them separately.

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Corner Studs

At every corner where two walls meet, add 1–3 extra studs depending on your corner detail (California corner, 3-stud corner, or L-corner). The calculator adds 1 extra per corner as a baseline.

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Waste Factor

Always order 10% more than your calculated total. For gable walls, order 15–20% extra because every gable stud is a different length and angled-cut waste is higher.

Stud Spacing Calculator — 16 OC vs 24 OC

Stud spacing is the distance from center of one stud to center of the next. The two most common spacings are 16 inches on center (16 OC) and 24 inches on center (24 OC). The stud spacing calculator above lets you switch between both and see the count difference instantly.

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16 Inches On Center (Standard)

Required for all load-bearing walls, exterior walls, and walls carrying floor or roof loads. The industry default for residential framing. Results in 0.75 studs per linear foot.

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24 Inches On Center (Partition)

Acceptable for non-load-bearing interior partition walls. Uses ~33% fewer studs than 16 OC — a meaningful material saving on large projects. Results in 0.5 studs per linear foot.

⚠️ Code NoteAlways check your local building code before choosing 24 OC spacing. Many jurisdictions require 16 OC for walls over 8 feet tall, exterior walls, and anywhere drywall requires closer support. When in doubt, frame at 16 OC.

Spacing	10 ft wall	20 ft wall	100 ft wall	Best Use
12″ OC	11	21	101	High-load or tall walls
16″ OC	9	16	76	Standard residential
19.2″ OC	7	13	63	Engineered lumber systems
24″ OC	6	11	51	Non-load-bearing partitions

Studs Per Linear Foot — Quick Reference

A quick way to estimate studs before using the full stud count calculator is the per-linear-foot method. This gives a fast ballpark for material ordering and cost estimation.

At 16″ OC: 0.75 studs per linear foot
At 24″ OC: 0.5 studs per linear foot

Example — 48 linear feet at 16 OC:
48 × 0.75 + 1 (end stud) = 37 standard studs

Wall Length	16 OC (studs)	24 OC (studs)	Difference
8 ft	7	5	2
10 ft	9	6	3
12 ft	10	7	3
16 ft	13	9	4
20 ft	16	11	5
24 ft	19	13	6
30 ft	23	16	7
40 ft	31	21	10

Stud Calculator for Walls — Single Wall Framing

For a single wall, the calculation is straightforward: measure the total length, divide by your spacing, add 1 for the end stud, then add extras for openings and corners. The wall stud calculator above handles this in under 60 seconds.

📐 Interior Wall Stud CalculatorInterior partition walls can use 24 OC spacing in most jurisdictions, reducing material cost by ~25%. Use 16 OC for any wall where cabinets, shelves, or heavy fixtures will be mounted — the closer spacing gives you a stud wherever you need to fasten.

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Basement Wall Framing

Basement framing is usually non-load-bearing (the concrete wall carries the load), so 24 OC is often acceptable. Always include a pressure-treated bottom plate where it contacts concrete.

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Stud Layout Starting Point

Stud layout starts at 15.25″ from the wall start, not 16″. This ensures the first drywall sheet edge falls at the center of the second stud, so sheets break correctly every time.

Stud Calculator for a Room — 4-Wall Estimate

For a full room, calculate the total perimeter (2 × length + 2 × width) then apply the standard formula. Add 4 corner studs for a rectangular room plus any door and window studs. The room mode in the calculator above does this automatically.

Room perimeter: P = 2 × (Length + Width)
Standard studs: (P ft × 12 ÷ Spacing) + 4 corners

Example — 12×12 room at 16 OC:
P = 2 × (12 + 12) = 48 ft
Studs = (48 × 0.75) + 4 = 40 → Order 44 (with 10% waste)

Room Size	Perimeter	16 OC	24 OC	Order (10% waste)
8×8 ft	32 ft	28	20	31 / 22
10×10 ft	40 ft	34	24	37 / 26
12×12 ft	48 ft	40	28	44 / 31
12×14 ft	52 ft	43	30	47 / 33
14×16 ft	60 ft	49	34	54 / 37
16×20 ft	72 ft	58	40	64 / 44
20×24 ft	88 ft	70	48	77 / 53

Stud Calculator for a Shed

A shed stud calculation covers all four walls plus doors and windows. Use the shed mode in the stud calculator above to get an automatic per-wall breakdown. For sheds, 16 OC framing is standard because shed walls carry roof loads and need solid backing for cladding.

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Common Shed Stud Counts

8×10 ft shed at 16 OC ≈ 40 studs. 10×12 ft ≈ 48 studs. 12×16 ft ≈ 58 studs. These assume 8 ft wall height, 4 corners, one standard door, and 10% waste.

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Tilt-Up Framing Tip

Pre-assemble wall frames flat on the floor, then tilt them up into position. This is faster and more accurate than building walls in place. Use double top plates on all walls to carry roof load.

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Stud Size for Sheds

2×4 studs at 16 OC are standard for shed walls up to 8 ft tall. For taller sheds or those in high-wind or heavy-snow areas, 2×6 studs provide extra strength. Always pressure-treat the bottom plate.

Stud Calculator with Door & Window Openings

Every door and window opening requires additional studs beyond the standard layout. The stud calculator above adds these automatically when you enter openings in Step 3.

Per door opening:
+2 king studs (full height) + 2 jack studs (trimmer studs)
Net addition: +4 studs per door

Per window opening:
+2 king studs + 2 jack studs + cripple studs (above & below)
Cripple count depends on window size and stud spacing

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Door Rough Opening

Standard interior door rough opening = door width + 2″ × door height + 1.5–2″. Example: 32″ door = 34″ rough opening. King stud runs full wall height; jack stud runs to the bottom of the header.

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Window Rough Opening

Window rough openings = window width + 2″ × window height + 2″. Windows need both a header above and a sill below, with cripple studs filling the space between sill and bottom plate.

Metal Stud Calculator — Steel Framing

Metal (steel) studs use the same spacing and count formula as wood studs, but the material list also includes track (runner) for top and bottom, which equals 2× your total linear wall footage. The stud calculator above supports metal stud mode — switch in Step 1.

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Metal Stud Formula

Count = (Length ft × 12 ÷ Spacing) + 1. Also order: Track = 2 × total linear footage. Metal studs are sold in linear feet — a 25-gauge 3-5/8″ stud is the most common partition stud.

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When to Use Metal Studs

Ideal for non-load-bearing interior partitions, commercial tenant improvements, and fire-rated assemblies. Straighter than wood, won't shrink or warp. Not for load-bearing walls without an engineer's sign-off.

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Metal Stud Gauge Guide

25-gauge: Light partitions to 12 ft. 20-gauge: Walls to 16 ft. 18-gauge: Tall or structural applications. Lower gauge number = thicker, stronger steel. Most commercial partitions use 20-gauge at 16″ OC.

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Metal vs Wood Cost

Metal studs are typically cheaper per stud ($1–$3 vs $4–$8 for 2×4 lumber), but require tin snips and screw guns rated for metal. Total installed cost is generally similar to wood.

Stud Size	Gauge	Max Height (16 OC)	Typical Use
1-5/8″ (41mm)	25	Up to 8 ft	Closets, chasings
2-1/2″ (64mm)	25–20	Up to 12 ft	Standard partitions
3-5/8″ (92mm)	25–18	Up to 16 ft	Commercial interior walls
6″ (152mm)	20–16	Up to 22 ft	Tall demising walls

Wood Stud Calculator — Lumber & Framing

Wood studs are the most common choice for residential framing. The wood stud calculator above gives you a count for 2×4, 2×6, or 2×3 lumber and works for any wall type. Pre-cut studs (92-5/8″ for 8-foot walls) save time over cutting from full-length lumber.

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2×4 Studs (Most Common)

The industry standard for most interior and exterior walls. Actual dimensions 1.5″ × 3.5″. At 16 OC with 2×4 framing, you have 3.5 inches of insulation space — suitable for R-13 batts.

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2×6 Studs (Exterior)

Used for exterior walls where extra insulation is required (R-19 vs R-13). 2×6 framing at 24 OC is a popular energy-efficient strategy — fewer studs reduce thermal bridging while deeper cavities hold more insulation.

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Pre-Cut vs Full-Length

Pre-cut studs (92-5/8″) fit between double top plates and a single bottom plate in an 8-foot wall with no field cutting. Full-length 2×4×8 lumber offers more flexibility but requires cutting on atypical wall heights.

Gable Stud Calculator

A gable wall follows the roof slope — studs are spaced at the same OC spacing, but each is a different height. The gable stud calculator above estimates total studs needed; order all at ridge height and cut each to its angle on site.

Gable stud count (approximate):
Studs = (Gable Width ft ÷ 2) × (12 ÷ Spacing) + 1

Order all studs at ridge height (max length).
Average stud length ≈ (Ridge Height + Eave Height) ÷ 2

📐 Rake Wall vs Gable WallA rake wall is the same concept — one level plate, one pitched plate, creating studs of varying heights. The gable wall mode in the calculator covers both types. Add 15–20% waste for all gable or rake walls.

Stud Layout & Placement

Stud layout is about more than count — it's about where each stud lands so drywall, sheathing, and fixtures align correctly. The standard layout starts the first stud at 15.25″ from the corner, not 16″.

Standard 16 OC layout positions (from corner):
15¼″ — 31¼″ — 47¼″ — 63¼″ — 79¼″ — 95¼″ ...

Each position = previous + 16″
First stud offset: 16″ − ¾″ (half of 1.5″ stud width) = 15¼″

24 OC layout: 23¼″ — 47¼″ — 71¼″ — 95¼″ ...

This offset ensures 4-foot drywall sheets always have their edges at the center of a stud rather than between studs. Starting at exactly 16″ leaves the first sheet's far edge at the face of a stud — no backing for the screw edge.

Quick Reference Tables

Use these for fast material estimates. For precise calculations with openings, corners, and waste, use the stud count calculator above.

Wall Length	12″ OC	16″ OC	24″ OC	Plates (lin ft)
4 ft	5	4	3	8 ft
6 ft	7	6	4	12 ft
8 ft	9	7	5	16 ft
10 ft	11	9	6	20 ft
12 ft	13	10	7	24 ft
16 ft	17	13	9	32 ft
20 ft	21	16	11	40 ft
24 ft	25	19	13	48 ft
30 ft	31	23	16	60 ft
40 ft	41	31	21	80 ft

Studs Needed for Common Shed Sizes

Shed Size	Perimeter	16 OC studs	+ 1 door	Order (10% waste)
6×8 ft	28 ft	25	29	32
8×10 ft	36 ft	31	35	39
10×12 ft	44 ft	37	41	45
12×16 ft	56 ft	46	50	55
14×20 ft	68 ft	55	59	65
16×24 ft	80 ft	64	68	75

Stud Calculator — Frequently Asked Questions

Divide the wall length in inches by your stud spacing (16 or 24 inches), then add 1 for the end stud. Formula: Studs = (Wall Length ft × 12 ÷ Spacing in) + 1. For a 12-foot wall at 16 OC: (12 × 12 ÷ 16) + 1 = 10 studs. Add extras for corners, doors, and windows. Use the wall stud calculator above for an instant result.

At 16 inches on center: 0.75 studs per linear foot. At 24 inches on center: 0.5 studs per linear foot. Multiply wall length in feet by 0.75 or 0.5, add 1 for the end stud, then apply a 10% waste factor.

Standard residential wall framing uses 16 inches on center (16 OC). This is required for load-bearing walls and provides solid backing for 48-inch drywall sheets. 24 OC is used for non-load-bearing partition walls to reduce material cost. Always verify with your local building code.

A 10-foot wall at 16 OC needs approximately 9 studs: (10 × 12 ÷ 16) + 1 = 8.5, rounded up to 9. Add 1–2 extra for corners and 2 king + 2 jack studs per door or window opening.

A 12×12 room has a total perimeter of 48 linear feet. At 16 OC: (48 × 0.75) + 4 corner studs = 40 studs — order 44 with 10% waste. At 24 OC: 28 studs — order 31. Add door and window studs on top of these numbers.

Wood studs (2×4 or 2×6) are used for structural load-bearing and exterior framing. Metal (steel) studs are lighter, perfectly straight, and non-combustible — ideal for interior partition walls and commercial construction. Metal studs use the same count formula but also require track (runner) for top and bottom plates. See the metal stud calculator section above.

Calculate standard stud count for the full wall length, then add 2 king studs (full height) and 2 jack studs (trimmer studs) per door opening. Net addition: approximately 4 extra studs per door. Use Step 3 of the calculator above to add doors and windows automatically.

Calculate each wall separately using (Wall Length ft × 12 ÷ 16) + 1, then sum all four walls. Add 4 corner studs, door studs (2 king + 2 jack per door), and window studs. Use the shed mode in the stud calculator above for an automatic estimate.

Gable studs are evenly spaced but each is a different height. Count: (Gable Width ÷ 2) × (12 ÷ Spacing) + 1. Order all studs at ridge height and cut each to angle on site. Add 15–20% waste for the angled cuts. See the gable stud calculator section above.

16 on center (16 OC) means the center of each stud is exactly 16 inches from the center of the next stud. 48-inch drywall sheets always land on a stud because 48 is divisible by 16. See the stud spacing section above to compare 16 OC vs 24 OC.

Metal stud count = (Wall Length ft × 12 ÷ Spacing in) + 1, same as wood. Also order track: Track = 2 × total wall linear footage. Add 10% waste. Use metal stud mode in the calculator above.

Studs per square foot depends on wall height. For an 8-foot wall at 16 OC: 0.75 studs per linear foot ÷ 8 ft = approximately 0.094 studs per square foot of wall area. For most estimating purposes, it's easier to work in linear feet. Use the studs per linear foot table above.

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