How many studs do I need for a 10-foot wall?

For a 10′ wall at 16″ on-center spacing: 10 studs (9 base studs + 1 for waste, including the end stud). At 24″ spacing: 7 studs. Use the calculator below for any wall length. Metric: For a 3 m wall at 400 mm on-center spacing: 10 studs including a 10% waste margin. At 600 mm spacing: 7 studs. Use the calculator below for any wall length.

Is 16-inch or 24-inch stud spacing better?

16″ on-center is the structural default - required by most building codes for load-bearing walls and standard for drywall (which comes in 4′ panels = 48″, evenly divisible by 16). 24″ OC is allowed for non-load-bearing partitions and saves ~33% in studs, but check your local code before using it on exterior or load-bearing walls. Metric: 400 mm on-center is the closer, stiffer layout and is commonly used where boards, sheathing, or load tables call for tighter framing. 600 mm OC saves timber and insulation space, but use it only where your local code and board spans allow it.

Why is 16-inch stud spacing standard?

Three reasons: (1) drywall and plywood sheets are 48″ wide, which divides evenly into 16″ increments so every joint lands on a stud; (2) 2×4 studs at 16″ OC carry typical residential roof loads with margin; (3) electrical and plumbing layouts assume 16″ bays. Metric: Three reasons: (1) many metric boards are made around 1200 mm widths, which divide cleanly by 400 mm; (2) close stud spacing gives better wall stiffness and fixing support; (3) many trade layouts assume regular 400 mm or 600 mm bays.

What is the difference between 16″ OC and 24″ OC?

OC means "on-center" - the distance from the centre of one stud to the centre of the next. 16″ OC gives you ~33% more studs than 24″ OC, which means stiffer walls, better drywall support, and capacity for heavier loads. 24″ OC saves lumber but is only allowed on non-load-bearing or carefully engineered walls. Metric: OC means "on-center" - the distance from the centre of one stud to the centre of the next. 400 mm OC gives you more studs than 600 mm OC, which means stiffer walls and better board support. 600 mm OC saves timber but depends on the wall type, sheathing, and local code.

How much waste should I add to my stud count?

Industry standard is 10% - covers cuts for headers, blocking, cripples around windows and doors, plus the occasional bad piece. Bump to 15% for complex walls with lots of openings, or drop to 5% for a simple straight run with experienced framers.

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Stud Calc / Wall Framing Calculator

Exact stud count for any wall length at standard on-center spacings. 16″ or 24″ imperial, 400 or 600mm metric, auto-detected by region. Built-in 10% waste margin. Mobile-first for jobsite use.

Units

Wall Dimensions

Wall length (ft)

Stud spacing (on-center)

Waste margin (%)

Studs Needed - 2× framing studs - base + - waste

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Next step

Planning insulation after framing?

Once the stud bays are framed, estimate batt pack coverage and waste for the wall cavity.

Open the Insulation Calculator →

Floor framing next

After the wall stud count, use the floor joist calculator to count joists, blocking rows, rim boards, and linear framing length for a simple floor layout.

Open the floor joist calculator →

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Wall framing guides

For angled or detailed framing jobs, use the rake wall calculator, the wall framing with doors and windows guide, the stud count calculator, or the board foot calculator before building your cut list. If the wall needs panel coverage, use the plywood sheathing calculator to estimate OSB or plywood sheets.

Need a quick stud calc?

Use the stud calc and wall stud calculator guide for common 10 ft, 12 ft, 16 ft, 20 ft, 400mm, and 600mm framing estimates. For openings, use the wall framing with doors and windows guide to plan king studs, jack studs, headers, sills, and cripples.

How to use this calculator

Enter the total length of the wall. Pick stud spacing. 16″ on center is the residential default - required for most load-bearing walls and divides evenly into 4′ drywall sheets. 24″ on center is allowed for some non-load-bearing and energy-efficient framing under modern codes. The result is the total stud count including the end stud and waste margin.

The formula

Studs = ceil((ceil(length ÷ spacing) + 1) × (1 + waste)). The +1 is the end stud (fencepost rule). The ceiling rounds up so partial studs become whole boards.

Worked example. A 16′ wall at 16″ on center:

16 ft × 12 in/ft = 192 inches
ceil(192 ÷ 16) = 12 spaces
Base studs: 12 + 1 = 13
With 10% waste: ceil(13 × 1.10) = 15 studs total

In practice you also add: 2 studs per corner, 2 trimmers + 1 king per opening (door or window), and 2 per partition wall intersection. This calculator gives the base count; add per-opening lumber separately.

Stud counts at a glance (no openings, 10% waste)

Wall length	16″ OC400 mm OC	24″ OC600 mm OC
8 ft2.4 m	8	6
10 ft3 m	10	7
12 ft3.6 m	11	8
16 ft4.8 m	15	10
20 ft6 m	18	13
24 ft7.2 m	21	15
32 ft9.6 m	28	19

16″ vs 24″ on center - which to use400 mm vs 600 mm on center - which to use

16″ on center is the residential default. Works with all common drywall (4′ panels = 48″, divides evenly), most siding, and standard load tables. Choose this unless you have a specific reason not to.

24″ on center (advanced framing) uses less lumber, leaves more space for insulation, and is permitted for many non-load-bearing walls and some load-bearing walls when stacked over joists and trusses (inline framing). Confirm with your local building department.

Pre-cut stud lengths

For 8′ ceilings, use 92 5/8″ pre-cut studs. For 9′, use 104 5/8″. For 10′, use 116 5/8″. These dimensions account for the top and bottom plates.

Common Questions

How many studs do I need for a 10-foot wall?How many studs do I need for a 3-meter wall?: For a 10′ wall at 16″ on-center spacing: 10 studs (9 base studs + 1 for waste, including the end stud). At 24″ spacing: 7 studs. Use the calculator below for any wall length.For a 3 m wall at 400 mm on-center spacing: 10 studs including a 10% waste margin. At 600 mm spacing: 7 studs. Use the calculator below for any wall length.
Is 16-inch or 24-inch stud spacing better?Is 400 mm or 600 mm stud spacing better?: 16″ on-center is the structural default - required by most building codes for load-bearing walls and standard for drywall (which comes in 4′ panels = 48″, evenly divisible by 16). 24″ OC is allowed for non-load-bearing partitions and saves ~33% in studs, but check your local code before using it on exterior or load-bearing walls.400 mm on-center is the closer, stiffer layout and is commonly used where boards, sheathing, or load tables call for tighter framing. 600 mm OC saves timber and insulation space, but use it only where your local code and board spans allow it.
Why is 16-inch stud spacing standard?Why is 400 mm stud spacing standard?: Three reasons: (1) drywall and plywood sheets are 48″ wide, which divides evenly into 16″ increments so every joint lands on a stud; (2) 2×4 studs at 16″ OC carry typical residential roof loads with margin; (3) electrical and plumbing layouts assume 16″ bays.Three reasons: (1) many metric boards are made around 1200 mm widths, which divide cleanly by 400 mm; (2) close stud spacing gives better wall stiffness and fixing support; (3) many trade layouts assume regular 400 mm or 600 mm bays.

What is the difference between 16″ OC and 24″ OC?What is the difference between 400 mm OC and 600 mm OC?: OC means "on-center" - the distance from the centre of one stud to the centre of the next. 16″ OC gives you ~33% more studs than 24″ OC, which means stiffer walls, better drywall support, and capacity for heavier loads. 24″ OC saves lumber but is only allowed on non-load-bearing or carefully engineered walls.OC means "on-center" - the distance from the centre of one stud to the centre of the next. 400 mm OC gives you more studs than 600 mm OC, which means stiffer walls and better board support. 600 mm OC saves timber but depends on the wall type, sheathing, and local code.
How much waste should I add to my stud count?How much waste should I add to my stud count?: Industry standard is 10% - covers cuts for headers, blocking, cripples around windows and doors, plus the occasional bad piece. Bump to 15% for complex walls with lots of openings, or drop to 5% for a simple straight run with experienced framers.Industry standard is 10% - covers cuts for headers, blocking, cripples around windows and doors, plus the occasional bad piece. Bump to 15% for complex walls with lots of openings, or drop to 5% for a simple straight run with experienced framers.

Materials & Tools

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