Drywall Sizes: Sheet Dimensions, Thicknesses and Weights
Every standard drywall (gypsum board) sheet size and thickness, what each is used for, what code requires on ceilings and garage walls, and how to work out how many sheets a room needs.
Standard drywall sheets are 4 ft wide (48 in, 1,219 mm) and 8, 9, 10, 12, 14 or 16 ft long, with 4 × 8 ft the most common. The usual thickness is 1/2 in (12.7 mm) for walls and 5/8 in (15.9 mm) for ceilings on 24 in framing and for fire-rated walls; 1/4 and 3/8 in are used for curves and overlays.
- Most common sheet
- 4 × 8 ft (32 sq ft)
- Wall thickness
- 1/2 in (12.7 mm)
- Ceiling / fire
- 5/8 in (15.9 mm)
- 4 × 8 × 1/2 weight
- about 48-57 lb
On this page
- Standard drywall sheet sizes
- Drywall thickness chart
- Specialty drywall types
- How much a sheet of drywall weighs
- What code requires: framing, fasteners and garage walls
- How many sheets of drywall you need
- Hanging direction and seam planning
- Finish levels (GA-214)
- Plasterboard sizes outside North America
- Frequently asked questions
Standard drywall sheet sizes
Every common sheet in North America is 4 ft wide, except 54 in boards for 9 ft walls. Longer sheets mean fewer joints to tape but are heavier and need two people.
| Sheet size | Inches | Millimeters | Area | Best for |
|---|---|---|---|---|
| 4 × 8 ft | 48 × 96 | 1,219 × 2,438 | 32 sq ft (2.97 m²) | DIY, small rooms, vertical hanging on 8 ft walls |
| 4 × 9 ft | 48 × 108 | 1,219 × 2,743 | 36 sq ft | Vertical hanging on 9 ft walls |
| 4 × 10 ft | 48 × 120 | 1,219 × 3,048 | 40 sq ft | 10 ft walls, 10 ft room spans |
| 4 × 12 ft | 48 × 144 | 1,219 × 3,658 | 48 sq ft (4.46 m²) | Horizontal hanging, ceilings; the pro default |
| 4 × 14 ft | 48 × 168 | 1,219 × 4,267 | 56 sq ft | Long walls without butt joints |
| 4 × 16 ft | 48 × 192 | 1,219 × 4,877 | 64 sq ft | Commercial work, long ceilings |
| 54 in × 12 ft | 54 × 144 | 1,372 × 3,658 | 54 sq ft | 9 ft walls in two horizontal rows |
Big-box stores usually stock 4 × 8 and 4 × 12 ft in 1/2 in and 5/8 in; other lengths are supplier items. A 4 × 8 sheet fits flat in a full-size pickup bed with the tailgate down or on a roof rack, but not inside most SUVs.
Drywall thickness chart
| Thickness | mm | Typical use | Framing limit (IRC) |
|---|---|---|---|
| 1/4 in | 6.4 | Curved walls (often doubled), resurfacing old plaster | Not for single-layer use on open framing |
| 3/8 in | 9.5 | Overlaying damaged walls, remodel patching | Walls; check local code |
| 1/2 in | 12.7 | Standard for interior walls; ceilings on 16 in framing | Walls to 24 in; ceilings 16 in perpendicular |
| 1/2 in ceiling board | 12.7 | Sag-resistant ceilings, textured ceilings | Ceilings to 24 in |
| 5/8 in (often Type X) | 15.9 | Ceilings, fire-rated walls, garage ceilings, sound walls | Walls and ceilings to 24 in |
Gypsum board is sold at its actual thickness, unlike lumber and plywood: a 1/2 in sheet is a true 1/2 in. A 2x4 stud wall with 1/2 in board on both sides finishes at 4 1/2 in thick, which is why standard interior door jambs are 4 9/16 in wide.
Specialty drywall types
- Type X (fire-resistant): glass fibers in the core keep it intact longer in a fire. 5/8 in Type X is the basic layer in most 1-hour rated walls and ceilings. Type C goes further with more additives and is used in specific listed assemblies.
- Moisture- and mold-resistant: treated paper or fiberglass facings, usually green or purple depending on the brand. For bathrooms, laundry rooms and basements, but not for wet areas inside showers.
- Cement board and tile backer: not gypsum, but often stocked next to it. Typically 3 × 5 ft or 4 × 8 ft, 1/4 in (for floors and countertops) or 1/2 in (for walls). Used behind tile in showers and tub surrounds.
- Abuse- and impact-resistant: harder face and denser core for hallways, garages and schools.
- Sound-damping board: laminated layers with a viscoelastic core that improves wall sound ratings; heavier and more expensive than doubling standard board.
- Lightweight 1/2 in: about 20-25% lighter than standard board, with the same uses. Most DIY sheets sold today are this type.
How much a sheet of drywall weighs
| Board | 4 × 8 ft | 4 × 12 ft |
|---|---|---|
| 1/2 in lightweight | 38-45 lb (17-20 kg) | 57-67 lb (26-30 kg) |
| 1/2 in standard | 48-57 lb (22-26 kg) | 72-86 lb (33-39 kg) |
| 5/8 in Type X | 65-75 lb (29-34 kg) | 98-112 lb (44-51 kg) |
Weights differ by manufacturer and product; the exact figure is on the bundle label or the product data sheet. A stack of 10 sheets of 1/2 in 4 × 8 weighs 380 to 570 lb, which matters when you load a truck or stage material on an upper floor.
What code requires: framing, fasteners and garage walls
The International Residential Code (Table R702.3.5) and ASTM C840 set the minimums for single-layer drywall on wood framing:
| Location | Max framing spacing | Screw spacing | Nail spacing |
|---|---|---|---|
| Walls, 1/2 in | 24 in | 16 in | 8 in |
| Ceilings, 1/2 in | 16 in (perpendicular) | 12 in | 7 in |
| Ceilings, 5/8 in or 1/2 in ceiling board | 24 in (perpendicular) | 12 in | 7 in |
- Screw length: drywall screws must penetrate wood framing at least 5/8 in, so use 1 1/4 in screws for 1/2 in board and 1 5/8 in for 5/8 in board. See screw sizes.
- Garage separation (IRC R302.6): at least 1/2 in gypsum board on the garage side of walls shared with the house, and 5/8 in Type X on the garage ceiling when there is a habitable room above. Local codes can be stricter.
- Fire-rated assemblies must follow their tested listing exactly, including board type, layers, orientation and fastener spacing.
How many sheets of drywall you need
- Measure the walls. Add the room's wall lengths and multiply by the ceiling height. A 12 × 14 ft room with 8 ft ceilings: 52 ft × 8 ft = 416 sq ft.
- Add the ceiling. 12 × 14 = 168 sq ft. Total: 584 sq ft.
- Subtract only large openings. Garage doors, patio doors and big windows. Board over ordinary doors and windows and cut them out; the offcuts rarely save a sheet.
- Divide by sheet area. 584 ÷ 32 = 18.3 sheets of 4 × 8, or 584 ÷ 48 = 12.2 sheets of 4 × 12.
- Add 10-15% for waste. Order 21 sheets of 4 × 8 or 14 sheets of 4 × 12.
| Material | Quantity | For the 584 sq ft example |
|---|---|---|
| Paper joint tape | 370 ft | About 220 ft: one 250 ft roll |
| Lightweight all-purpose compound | About 9 gal (two 4.5 gal pails) | About 5.3 gal: two pails |
| Screws | About 1,000 | About 600, or a 5 lb box of 1 1/4 in |
Tape and compound figures come from USG product literature for its own products; other compounds and heavier finishing use more.
Hanging direction and seam planning
On an 8 × 12 ft wall, two 4 × 12 sheets hung horizontally leave one 12 ft seam at 4 ft height, easy to reach and finish. Three 4 × 8 sheets hung vertically leave two 8 ft seams, a third more joint to tape, and each one must land on a stud. Horizontal hanging also bridges uneven studs better.
The tapered long edges are easy to finish; the square-cut ends (butt joints) are not. Pick the sheet length that spans the whole wall or ceiling where you can: a 13 ft 6 in room gets 14 ft sheets, not 12 ft sheets plus a strip.
Finish levels (GA-214)
- Level 0-1: no finishing or tape only, for attics and areas hidden above ceilings.
- Level 2: tape plus one coat, for garages, storage areas and walls that will get tile.
- Level 3: two coats, under heavy texture.
- Level 4: three coats, the usual finish for flat or eggshell paint in homes.
- Level 5: Level 4 plus a full skim coat, for gloss paint and walls lit at a low angle.
Plasterboard sizes outside North America
| Region | Common sheet (mm) | Thicknesses (mm) |
|---|---|---|
| United Kingdom | 1,200 × 2,400 (also 900 × 1,800 and 1,200 × 2,700) | 9.5, 12.5, 15 |
| Continental Europe | 1,250 × 2,000 to 2,600 | 12.5, 15 |
| Australia | 1,200 or 1,350 wide, 2,400 to 6,000 long | 10, 13, 16 |
A UK 12.5 mm board is 0.2 mm thinner than US 1/2 in, close enough to treat as equal; a 1,200 mm sheet is 19 mm narrower than a US 4 ft sheet, so metric studs are set at 400 or 600 mm centers rather than 16 or 24 in.
Frequently asked questions
What size drywall should I use for walls?
1/2 in thick drywall is standard for interior walls on studs at 16 or 24 in on center. Choose sheet length to suit the wall: 4 × 12 ft sheets hung horizontally cover an 8 ft wall in two rows with one long seam, while 4 × 8 ft sheets are easier to carry and fit in a car.
Can I use 1/2 inch drywall on a ceiling?
Yes, on joists 16 in on center with the sheets run perpendicular to the framing. For 24 in spacing, use 5/8 in board or 1/2 in sag-resistant ceiling board, as IRC Table R702.3.5 requires.
How many sheets of drywall do I need for a 12 x 12 room?
With 8 ft ceilings, the walls are 48 ft × 8 ft = 384 sq ft and the ceiling is 144 sq ft, so 528 sq ft in total. That is 16.5 sheets of 4 × 8, or 18 to 19 sheets with 10% extra. Using 4 × 12 sheets, you need 11 to 12.
What drywall should I use in a bathroom?
Use moisture- and mold-resistant 1/2 in board for bathroom walls and ceilings outside the shower. Inside a tub surround or shower, use cement board or a foam or gypsum-based tile backer with a waterproofing membrane; regular gypsum board breaks down when it stays wet.
What is 54 inch drywall used for?
54 in (4 ft 6 in) wide sheets let you cover a 9 ft wall in two horizontal rows with one seam, the same way 48 in sheets cover an 8 ft wall. They come in 12 ft lengths, 54 sq ft per sheet.
Is drywall really 1/2 inch thick?
Yes. Unlike lumber and plywood, gypsum board thickness is actual: 1/2 in board measures 1/2 in (12.7 mm) and 5/8 in board measures 5/8 in (15.9 mm), within ASTM C1396 tolerances of 1/64 in.