How many sheets of drywall do I need for a 12x14 room?

With 9 ft walls and the ceiling included, 596 sq ft of board after deducting two doorways. In 4 by 12 ft sheets that is 13 sheets net, or 14 with a 10% allowance for cuts. In 4 by 8 sheets it is 19, and you get considerably more butt joints.

How far apart do drywall screws go?

It depends on where the board is. IRC Table R702.3.5 gives 16 in for screws on a 1/2 in wall at 16 in framing, 12 in on the ceiling, and 6 in for Type X on a garage ceiling beneath a habitable room. Nails are always tighter than screws: 8 in and 7 in respectively for those wall and ceiling cases.

Why do garage ceilings need more drywall screws?

Because it is a fire separation rather than a deflection question. Table R702.3.5 gives Type X board at a garage ceiling beneath habitable rooms 6 in spacing for both nails and screws, against 12 in for screws on any other ceiling. That is double the fasteners, and the fastening is what keeps the board on the joists while the assembly does its job.

Can I use 3/8 inch drywall on a ceiling?

Only where the framing is at 16 in on center. Table R702.3.5 lists 3/8 in board for ceilings at 16 in and has no 24 in row for it at all, so on 24 in joists you need thicker board. On walls it is likewise listed only at 16 in.

Should drywall run horizontally or vertically?

At 16 in framing the table says either direction for most cases. At 24 in it says perpendicular for ceilings, so the choice disappears. Beyond the code, running horizontally on walls puts the tapered joint at a comfortable height and reduces the number of butt joints.

How many screws per sheet of drywall?

It is easier to count by area than by sheet, because it depends on framing spacing. The arithmetic is linear feet of framing behind the board, which is area divided by the spacing in feet, times fasteners per foot. A 168 sq ft ceiling on 16 in framing at 12 in spacing is 126 screws.

Do drywall butt joints have to land on a stud?

Yes. R702.3.5 requires all edges and ends to occur on framing members, except those perpendicular to the framing. A butt joint floating between studs is outside the code, not merely poor practice, and it is also the hardest joint to finish because there is no tapered edge.

What is the difference between Sheetrock and drywall?

None that matters for the count. Sheetrock is USG's brand name for gypsum board, and it is commonly used to mean any drywall. IRC Table R702.3.5 sets fastening by board thickness and framing spacing whatever the brand, so Sheetrock and any other gypsum board of the same thickness are counted the same way here.

What is the labor cost to hang and finish drywall per square foot?

The source carried on this page, Bob Vila, gives $1.15 to $3 per square foot installed all in. Split into labor lines, hanging only is $0.15 to $0.65 and taping and mudding $0.40 to $0.70 per square foot. The panel itself is $12 to $20 per sheet, and a 4x8 sheet covers 32 sq ft. The same rows apply whether a quote says drywall or sheetrock.

How much does it cost to drywall a basement?

The source has no separate basement row, so a basement is estimated like any other room: by the square footage of board on the walls and ceiling together. The drywall square footage from the calculator is the number to multiply. At $1.15 to $3 installed, the 596 sq ft of board in the 12x14 example would be $685 to $1,788.

What is a drywall skim coat and what does it cost?

A skim coat is a thin coat of joint compound spread over the entire surface, and it is what separates a Level 5 finish from Level 4. Bob Vila prices Level 5 finish labor at $1.15 to $3.50 per square foot against $1 to $3 for Level 4. Compound quantity for it is not counted on this page, because the quantity depends on the level of finish and on the product, as explained above.

How much does it cost to drywall a basement, garage or room?

Bob Vila's October 2022 article gives $1.15 to $3 per square foot of board installed, all in, and $12 to $20 per sheet. The area is the walls and ceiling together, which this page adds up, not the floor area. The source dates from 2022.

Is drywall cheaper than a drop ceiling?

Bob Vila's October 2022 article gives $1.15 to $3 per square foot for drywall installed. HomeAdvisor's June 2026 guide gives $9 to $13 per square foot for a standard drop ceiling with ceiling tiles installed, so a drywall ceiling usually costs less, though it gives no access above.

What is the labor cost to hang, tape and mud drywall?

Bob Vila's October 2022 article gives $0.15 to $0.65 per square foot to hang drywall and $0.40 to $0.70 to tape and mud it, with sanding and priming at $0.10 to $0.50. All in, installed, it is $1.15 to $3 per square foot. The article dates from 2022.

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Drywall Calculator

IRC Table R702.3.5 in full, including the garage ceiling row

Counting sheets is easy and every calculator does it. IRC Table R702.3.5 decides three things they ignore: whether the board thickness you bought is even listed at your framing spacing, which way the sheets have to run, and how many fasteners go in. And it contains one row, for a Type X garage ceiling under a habitable room, that calls for six inches for both nails and screws. That is double the fasteners of any other ceiling, and nothing on the board or the screw box tells you.

Board, fasteners and tape

Room length

Room width

Wall height

Board the ceiling too

Board thickness

Framing spacing

Is this a garage ceiling under a habitable room

Sheet size

Fastening with

Openings

no.

Opening width

Opening height

Waste allowance (ours, for cuts)

Priced as (the source's own row labels)

Fastener counts follow Table R702.3.5 for the thickness, application and framing spacing you enter. Joint compound is not calculated, and the reason is below.

Specification summary

Generated from on . Reopen that address to reproduce these figures exactly.

Entered

Result

One sheet, fastened as the table requires

Drywall prices

As stated per row
Item	Low	High	Unit
Panel, material	$12	$20	per sheet
Hanging only	$0.15	$0.65	per sq ft
Taping and mudding	$0.40	$0.70	per sq ft
Sanding and priming	$0.10	$0.50	per sq ft
Installed, all in	$1.15	$3	per sq ft
Level 1 finish, labor	$0.70	$1.50	per sq ft
Level 4 finish, labor	$1	$3	per sq ft
Level 5 finish, labor	$1.15	$3.50	per sq ft

Source: Bob Vila, how much does drywall installation cost. Last price check: September 8, 2026.

THIS SOURCE IS OLD. It was last updated in October 2022 and the figures were written before that. It is carried anyway because it is the only bylined source found that prices the GA-214 finish levels separately, which is the distinction the drywall page turns on. Treat the shape of it, Level 5 costing several times Level 1, as the useful part and the absolute figures as historical.

Drywall repair prices

Per repair
Item	Low	High	Unit
Drywall repair, typical job	$296	$929	total
Cracks and chips	$60	$400	total
Nail pop	$10	$60	total
Anchor holes	$75	$100	total
Tears	$20	$120	total
Water damage	$600	$1,550	total
Mold damage	$150	$350	total
Ceiling	$220	$1,300	total
Painting and texture to match	$150	$900	total

Source: HomeAdvisor, how much does drywall repair cost. Last price check: September 13, 2026.

The source says most drywall pros charge $50 to $75 per sq ft, which would make its $612 average repair about 8 to 12 sq ft of wall.

Worked example

A 14 by 12 ft room, 9 ft walls, ceiling included, 1/2 in board on framing at 16 in on center, 4 by 12 ft sheets, screws, two door openings, 10% waste.

Walls. 52 ft of perimeter by 9 ft is 468 sq ft, less 40 for two doorways, so 428 sq ft.
Ceiling. 14 × 12 = 168 sq ft, so 596 sq ft of board.
Sheets. A 4 by 12 sheet is 48 sq ft, so 596 ÷ 48 with 10% waste is 14 sheets.
Walls, R702.3.5. 1/2 in, either direction, 16 in o.c., screws at 16 in.
Ceiling, R702.3.5. 1/2 in, either direction, 16 in o.c., screws at 12 in. Tighter than the walls.
Fasteners. 241 in the walls and 126 in the ceiling: 367 screws.

Now set the garage question to yes and switch the board to 5/8 Type X. The ceiling screw spacing drops from 12 inches to 6 and the ceiling fastener count doubles from 126 to 252, on the same 168 sq ft. That row exists because a garage ceiling under a bedroom is a fire separation and the fastening is what holds the board up while it does its job. It is the single most missed line in the table.

The formula

Sheets are area. Fasteners are the framing behind the board:

sheets = ⌈A(1+k) / (wℓ)⌉ fasteners = (A / (oc/12)) × (12/s)

A: board area: net wall plus ceiling, sq ft
w, ℓ: sheet width and length, ft
oc: framing spacing, in. A/(oc/12) is the linear feet of framing behind the board
s: fastener spacing from Table R702.3.5, in. Depends on thickness, application and oc
k: waste allowance

The fastener term is linear feet of framing times fasteners per foot, which is why halving the spacing doubles the count exactly. It is also why a 24 in o.c. ceiling needs fewer fasteners than a 16 in one at the same spacing along each member: there is less framing behind the board.

Why the table matters more than the sheet count

A drywall calculator that returns a sheet count has answered the easy question. Sheets are area divided by area and nobody gets it badly wrong.

Table R702.3.5 answers the questions that decide whether the work passes. It pairs board thickness with framing spacing, and the pairing is not free: 3/8 in board appears for ceilings only at 16 in on center, so on 24 in joists it is simply not in the table.

It prescribes orientation at the wider spacings. Where framing is at 24 in, ceiling board goes perpendicular, which changes how many sheets you cut and often how many you need.

And it sets fastener spacing, tighter on ceilings than walls, tighter again on one specific ceiling. The garage row is the only place in an ordinary house where the answer doubles, and it is the row a quantity calculator will never mention because it has no idea what room you are in.

IRC Table R702.3.5, application without adhesive
Thickness, in	Application	Orientation to framing	Max framing, in o.c.	Nails, in	Screws, in
3/8	Ceiling	Perpendicular	16	7	12
3/8	Wall	Either direction	16	8	16
1/2	Ceiling	Either direction	16	7	12
1/2	Ceiling	Perpendicular	24	7	12
1/2	Wall	Either direction	24	8	12
1/2	Wall	Either direction	16	8	16
5/8	Ceiling	Either direction	16	7	12
5/8	Ceiling	Perpendicular	24	7	12
5/8	Type X at garage ceiling beneath habitable rooms	Perpendicular	24	6	6	double the normal ceiling
5/8	Wall	Either direction	24	8	12
5/8	Wall	Either direction	16	8	16

Read 2026-09-08. Transcribed from the 2018 Seattle Residential Code, page 435, which prints the model table in full.

Download this table as CSV. Same cells as printed above, nothing added.

Table R702.3.5, and what it decides besides fastener spacing

This is the half of a drywall job that a sheet count cannot see. The table is short enough to print whole, without adhesive:

IRC Table R702.3.5, minimum thickness and application of gypsum board, application without adhesive
Thickness, in	Application	Orientation to framing	Max framing, in o.c.	Nails, in	Screws, in
3/8	Ceiling	Perpendicular	16	7	12
3/8	Wall	Either direction	16	8	16
1/2	Ceiling	Either direction	16	7	12
1/2	Ceiling	Perpendicular	24	7	12
1/2	Wall	Either direction	24	8	12
1/2	Wall	Either direction	16	8	16
5/8	Ceiling	Either direction	16	7	12
5/8	Ceiling	Perpendicular	24	7	12
5/8	Type X at garage ceiling beneath habitable rooms	Perpendicular	24	6	6	double the normal ceiling
5/8	Wall	Either direction	24	8	12
5/8	Wall	Either direction	16	8	16

Three things fall out of it that people do not expect.

3/8 in board has no 24 in ceiling row. It is listed for ceilings at 16 in o.c. and nowhere else. If your ceiling joists are at 24, the table does not cover 3/8 board there at all.

Orientation is prescribed at the wider spacings. Where the framing is at 24 in the table says perpendicular, not either direction. Running sheets the long way along the joists to save cutting is a choice at 16 in and not one at 24.

Ceilings are fastened tighter than walls, 7 in against 8 for nails and 12 against 16 for screws, which is gravity rather than strength.

The garage ceiling row, which doubles the screws

One row in that table is unlike all the others:

Type X at garage ceiling beneath habitable rooms, perpendicular, 24 in o.c. framing, nails 6 in, screws 6 in. 1-7/8 in long 6d coated nails or equivalent drywall screws.

Six inches. Both. Every other ceiling in the table takes screws at 12 in. This one takes them at 6, which is twice as many fasteners over the whole ceiling, and it takes nails at 6 as well.

The reason is not deflection, it is fire. A garage ceiling under a habitable room is a separation, and the fastening is what keeps the board on the joists long enough for it to do its job. Type X board hung at ordinary ceiling spacing over a garage is not a lesser version of the assembly, it is a different assembly.

It is also the row most likely to be missed, because it is the only place in a normal house where the answer changes and nothing on the board or the box of screws tells you. The calculator flags it and doubles the count.

Sheet length is a code decision, not just handling

R702.3.5 requires all edges and ends to land on framing, except the ones running perpendicular to it. A butt joint floating in the middle of a bay is outside the code.

Which makes sheet length worth more than it looks. A 12 ft sheet on a 12 ft wall has no butt joint at all. Two 8 ft sheets on the same wall have one, and a butt joint is the weakest joint and the hardest to finish flat, because there is no tapered edge to bury the tape in.

Longer sheets are heavier and harder to get up a stairwell, and that is a real constraint. But the trade-off is fewer butt joints, not merely fewer joints, and the calculator lets you compare sheet sizes on the same room.

Screws against nails, and why the counts differ so much

The table gives both, and screws are always allowed further apart: 16 in against 8 on a 1/2 in wall at 16 in o.c., and 12 against 7 on the ceiling.

So nailing a room takes roughly twice the fasteners of screwing it. That is not a quality judgment in the table, it is a holding-power one, and it is why almost nobody hand-nails drywall any more.

The exception is the garage ceiling row, where nails and screws are both at 6 in. When the requirement is a fire separation rather than deflection, the table stops distinguishing between them.

The nail specifications are precise, incidentally: 13 gauge, 1 3/8 in long with a 19/64 in head for 1/2 in board, or a 5d cooler nail, or an 0.098 in annular-ringed nail. A roofing nail out of the wrong box is not on the list.

What this page does not count

Joint compound. The quantity is set by the level of finish, and the levels are defined in GA-214, which the Gypsum Association publishes and which is free to read. Taping a garage and finishing a Level 5 ceiling differ by several full-surface coats, so one compound figure would cover neither.

Corner bead, control joints and trims. Linear items that depend on the shape of the room rather than its area.

The tape figure is an estimate. It assumes about one sheet perimeter of joint per sheet, which is right for a plain rectangular room and generous for a long unbroken wall.

Fire and sound assemblies. A rated wall is a tested assembly, board, framing, fasteners and often resilient channel together, and substituting any part of it is not a quantity question.

What R702.3.5 says about where the edges go

Supports and fasteners used to attach gypsum board and gypsum panel products shall comply with Table R702.3.5. Gypsum board and gypsum panel products shall be applied at right angles or parallel to framing members. All edges and ends of gypsum board and gypsum panel products shall occur on the framing members, except those edges and ends that are perpendicular to the framing members. Interior gypsum board shall not be installed where it is directly exposed to the weather or to water.

Read the middle sentence. All edges and ends shall occur on the framing members, except those that run perpendicular to the framing.

Which means a butt joint floating between two studs is not a workmanship preference, it is outside the code, and it is the commonest thing a hurried hanger does when a sheet is an inch short. It is also why sheet length matters more than it looks: a 12 ft sheet on a 12 ft wall has no butt joint at all, and a butt joint is both the weakest and the hardest thing to finish flat.

And the last sentence rules out interior gypsum board anywhere directly exposed to weather or water, which is a different product question rather than a quantity one.

Where the table came from

Read 2026-09-08. 2018 Seattle Residential Code, Chapter 7 Wall Covering, Seattle Department of Construction and Inspections, page 435. Prints IRC Table R702.3.5 in full: thickness, application, orientation, maximum framing spacing and fastener spacing for nails and screws, plus the nail specifications. Used because codes.iccsafe.org returns HTTP 403.

Joint compound is deliberately not calculated on this page. How much you use is decided by the level of finish, and the levels are defined in GA-214, which the Gypsum Association publishes and which is free to read. The difference between taping a garage and finishing a Level 5 ceiling is several coats over the entire surface rather than over the joints, so a single compound figure would be a number pretending to be an answer. Tape is different: it follows the joints, and joints are geometry.

Frequently asked questions

How many sheets of drywall do I need for a 12x14 room?: With 9 ft walls and the ceiling included, 596 sq ft of board after deducting two doorways. In 4 by 12 ft sheets that is 13 sheets net, or 14 with a 10% allowance for cuts. In 4 by 8 sheets it is 19, and you get considerably more butt joints.
How far apart do drywall screws go?: It depends on where the board is. IRC Table R702.3.5 gives 16 in for screws on a 1/2 in wall at 16 in framing, 12 in on the ceiling, and 6 in for Type X on a garage ceiling beneath a habitable room. Nails are always tighter than screws: 8 in and 7 in respectively for those wall and ceiling cases.
Why do garage ceilings need more drywall screws?: Because it is a fire separation rather than a deflection question. Table R702.3.5 gives Type X board at a garage ceiling beneath habitable rooms 6 in spacing for both nails and screws, against 12 in for screws on any other ceiling. That is double the fasteners, and the fastening is what keeps the board on the joists while the assembly does its job.
Can I use 3/8 inch drywall on a ceiling?: Only where the framing is at 16 in on center. Table R702.3.5 lists 3/8 in board for ceilings at 16 in and has no 24 in row for it at all, so on 24 in joists you need thicker board. On walls it is likewise listed only at 16 in.
Should drywall run horizontally or vertically?: At 16 in framing the table says either direction for most cases. At 24 in it says perpendicular for ceilings, so the choice disappears. Beyond the code, running horizontally on walls puts the tapered joint at a comfortable height and reduces the number of butt joints.
How many screws per sheet of drywall?: It is easier to count by area than by sheet, because it depends on framing spacing. The arithmetic is linear feet of framing behind the board, which is area divided by the spacing in feet, times fasteners per foot. A 168 sq ft ceiling on 16 in framing at 12 in spacing is 126 screws.
Do drywall butt joints have to land on a stud?: Yes. R702.3.5 requires all edges and ends to occur on framing members, except those perpendicular to the framing. A butt joint floating between studs is outside the code, not merely poor practice, and it is also the hardest joint to finish because there is no tapered edge.
What is the difference between Sheetrock and drywall?: None that matters for the count. Sheetrock is USG's brand name for gypsum board, and it is commonly used to mean any drywall. IRC Table R702.3.5 sets fastening by board thickness and framing spacing whatever the brand, so Sheetrock and any other gypsum board of the same thickness are counted the same way here.
What is the labor cost to hang and finish drywall per square foot?: The source carried on this page, Bob Vila, gives $1.15 to $3 per square foot installed all in. Split into labor lines, hanging only is $0.15 to $0.65 and taping and mudding $0.40 to $0.70 per square foot. The panel itself is $12 to $20 per sheet, and a 4x8 sheet covers 32 sq ft. The same rows apply whether a quote says drywall or sheetrock.
How much does it cost to drywall a basement?: The source has no separate basement row, so a basement is estimated like any other room: by the square footage of board on the walls and ceiling together. The drywall square footage from the calculator is the number to multiply. At $1.15 to $3 installed, the 596 sq ft of board in the 12x14 example would be $685 to $1,788.
What is a drywall skim coat and what does it cost?: A skim coat is a thin coat of joint compound spread over the entire surface, and it is what separates a Level 5 finish from Level 4. Bob Vila prices Level 5 finish labor at $1.15 to $3.50 per square foot against $1 to $3 for Level 4. Compound quantity for it is not counted on this page, because the quantity depends on the level of finish and on the product, as explained above.
How much does it cost to drywall a basement, garage or room?: Bob Vila's October 2022 article gives $1.15 to $3 per square foot of board installed, all in, and $12 to $20 per sheet. The area is the walls and ceiling together, which this page adds up, not the floor area. The source dates from 2022.
Is drywall cheaper than a drop ceiling?: Bob Vila's October 2022 article gives $1.15 to $3 per square foot for drywall installed. HomeAdvisor's June 2026 guide gives $9 to $13 per square foot for a standard drop ceiling with ceiling tiles installed, so a drywall ceiling usually costs less, though it gives no access above.
How much does drywall repair cost?: HomeAdvisor's June 2026 guide gives $296 to $929 for a typical repair, $75 to $100 for anchor holes, $220 to $1,300 for a ceiling repair and $600 to $1,550 for water damage, with painting and texture to match at $150 to $900.
What is the labor cost to hang, tape and mud drywall?: Bob Vila's October 2022 article gives $0.15 to $0.65 per square foot to hang drywall and $0.40 to $0.70 to tape and mud it, with sanding and priming at $0.10 to $0.50. All in, installed, it is $1.15 to $3 per square foot. The article dates from 2022.

Check these numbers yourself

2018 Seattle Residential Code, Chapter 7 Wall CoveringSeattle Department of Construction and Inspections, page 435. Prints IRC Table R702.3.5 in full: thickness, application, orientation, maximum framing spacing and fastener spacing for nails and screws, plus the nail specifications. Used because codes.iccsafe.org returns HTTP 403.
Bob Vila, how much does drywall installation costWritten by Meghan Wentland and Evelyn Auer, published 31 October 2022, read 2026-09-08. SOURCE IS OVER THREE YEARS OLD, carried for the shape of the table rather than the figures. THIS SOURCE IS OLD. It was last updated in October 2022 and the figures were written before that. It is carried anyway because it is the only bylined source found that prices the GA-214 finish levels separately, which is the distinction the drywall page turns on. Treat the shape of it, Level 5 costing several times Level 1, as the useful part and the absolute figures as historical.
GA-214-2021, Levels of Finish for Gypsum Panel ProductsGypsum Association, 2021, hosted by member company American Gypsum. Defines finish Levels 0 to 5. Read 2026-09-16.

How every figure here is verified: Sources & Method. Who builds this: Lucas Pradella, and the method is on About. Found something wrong? Tell us and it gets fixed or removed.

Figures on this page last checked against the source documents on 2026-09-08. Codes are amended locally; confirm against the edition your jurisdiction enforces.

Related calculators

Guides that use this calculator

More of them: all guides.

One city's adopted code, printing the model table. Table R702.3.5 was read from the 2018 Seattle Residential Code on 8 September 2026 because codes.iccsafe.org returns HTTP 403. Joint compound, corner bead and trims are not calculated. A fire or sound rated assembly is a tested system and substituting any part of it is not a quantity question.