Home › Drywall Calculator › This size
How Many Sheets of Drywall for a 12×16 ft Room with an 8 ft Ceiling?
A 12 by 16 foot room with an 8 foot ceiling needs this many 4×8 drywall sheets, with mud, tape and screws worked out. Here is the answer, plus a calculator you can adjust if your measurements are slightly different.
Answer: 14 sheets
How it changes with ceiling height
Same area, different ceiling height:
| Ceiling height | 8 | 9 | 10 |
|---|---|---|---|
| Drywall sheets needed | 14 sheets | 16 sheets | 18 sheets |
| Gross wall area | 448 ft² | 504 ft² | 560 ft² |
What a 12×16 ft room with an 8 ft ceiling actually involves
At 397 ft² this is a solid two-person job. 14 sheets at 4 ft × 8 ft weigh roughly 770 lb in total, and a full sheet is awkward for one person on a ceiling or above shoulder height. Budget two days: hang on the first, tape and coat on the second.
The room has 56 ft of wall around 448 ft² of gross surface. Knock off 51 ft² for openings and you are boarding 397 ft², or 437 ft² once your 10 percent waste allowance is added. That is 14 sheets of 4 ft × 8 ft board.
Deducting 1 door and 2 windows removes 51 ft², or 11 percent of the wall. That is about 2 sheets you do not buy. Cutting openings out of a hung sheet wastes the offcut, which is exactly what the waste allowance in this calculator is for — do not set it to zero and expect the cuts to come out even.
An 8 ft ceiling divides exactly by 4, so a 4 ft wide sheet hung horizontally lands two full courses with no rip. That is the cheapest way this room can be boarded: no narrow strips to cut, no extra screws along a sliver of board, and nothing to fill above your head. Use it.
Where the square footage goes
| Measured as | Amount | How it is worked out |
|---|---|---|
| Perimeter | 56 ft | 12 ft + 16 ft, doubled |
| Gross wall area | 448 ft² | 56 ft × 8 ft ceiling |
| Doors deducted | 21 ft² | 1 × 21 ft² |
| Windows deducted | 30 ft² | 2 × 15 ft² |
| Net area to board | 397 ft² | gross minus openings |
| With 10% waste | 437 ft² | the figure to buy against |
| 4 ft × 8 ft sheets | 14 sheets | 437 ft² ÷ 32 |
| 4 ft × 12 ft sheets | 10 sheets | 437 ft² ÷ 48 |
| Ceiling, if you board it | 6 more sheets | 12 × 16 = 192 ft², no openings to deduct |
At 12 ft × 16 ft you have two 16 ft runs and two 12 ft runs. Board the long walls first and keep the offcuts — they are usually the right length for the short walls, which is where a 20 percent saving on sheet count comes from.
Wall by wall
4 ft × 8 ft sheets hung horizontally, at an 8 ft ceiling, divide into 2 courses per wall:
| Wall run | Surface | Pieces at 4 ft × 8 ft |
|---|---|---|
| 2 × 12 ft wall | 192 ft² | 2 sheets per course × 2 = 4 per wall, 8 in total |
| 2 × 16 ft wall | 256 ft² | 2 sheets per course × 2 = 4 per wall, 8 in total |
Those are pieces, not sheets. Laid out literally the walls would take 16 pieces, against the 14 sheets you actually buy — the gap is the 0 ft offcut that comes off every 16 ft run and finishes the next course. It is the biggest saving available on a room this size, and it only works if you cut the long walls first and keep the offcuts.
At 16 ft by 12 ft the room is a straightforward rectangle. The two long walls need the most board and the two short walls are close to a whole number of sheets, so the offcuts off the long walls are usually the right length for the ends. Measure both before you cut, and cut the long walls first.
A 16 ft run takes 2 sheets per course and leaves 0 ft of offcut every time. The 16 ft runs take 2 each and leave 0 ft — which is the piece that usually finishes the ends without touching another full sheet.
Mud, tape and screws
| Item | Quantity | Rule of thumb |
|---|---|---|
| Joint compound | 2 gal | about 1 gal per 300 ft² for a level 4 finish |
| Joint tape | 1 roll | a 500 ft roll per 500 ft² of board |
| Drywall screws | 481 | about 1.1 per ft², roughly 32 per 4×8 sheet |
| Studs, if reframing | 52 | 1 per ft at 16 in centres, plus 4 for corners and 2 per opening |
| Corner bead | as needed | one length per outside corner, inside and outside |
Buy the mud in the largest tub that stays workable. A 2 gal job is 1 standard 4.5 gal bucket, and once a bucket is opened it skins over within days — powder you mix yourself keeps indefinitely and is cheaper per gallon on a job this size. Coat thin and build up: three thin passes sand far easier than two thick ones, and every extra pass costs you sanding time, not just mud.
How to hang it
- Mark and check the studs. Board goes across them, so it does not matter if the spacing wanders — but it does matter that you can find them after the board is up.
- Start at the top with a full 4 ft course, then a second full course below it.
- Stagger the vertical joints. A joint that lines up with the one on the other side of a stud is the one that cracks first.
- Keep the board about 1/2 in off a concrete floor and tight to the ceiling. Movement happens at the floor line, not at the ceiling.
- Screw about 12 in apart in the field and every 8 in on the edges, driving the heads just below the surface without breaking the paper. A screw that tears the paper holds nothing.
- Leave a 1/8 in gap at butt joints and fill it with mud before taping. Boards that are jammed tight buckle at the seam.
- This room needs 14 sheets and roughly 481 screws. Order the sheets and the screws together — a shortfall of 20 screws is a wasted trip.
Which board to buy
1/2 in board is the default for walls and is what the count above assumes. Step up to 5/8 in for ceilings and for bedrooms where you want the room to feel quieter; it sags less at 24 in centres and takes screws better, at about 20 percent more weight per sheet. Use 1/4 in only for curves. For bathrooms, laundry rooms and basements use moisture-resistant board — it is not waterproof, and it still needs a proper waterproofing layer behind a tiled shower. Board that is going to sit in a garage or a shed is worth buying in 5/8 in for the impact resistance alone.
Common questions
How many sheets of drywall for a 12×16 ft room with an 8 ft ceiling?
14 sheets of 4 ft × 8 ft board, or 10 if you buy 4 ft × 12 ft sheets. The walls come to 397 ft² after deducting 1 door and 2 windows, and 437 ft² with your 10 percent waste allowance.
Do I need to add the ceiling?
Only if you are boarding it. The ceiling here is 192 ft², which is 6 more 4 ft × 8 ft sheets, roughly 48 percent on top of the walls. Ceilings take longer per sheet than walls — everything is overhead — so treat it as separate work, not extra work.
How do I hang drywall on an 8 ft ceiling?
An 8 ft wall divides into two 4 ft courses with no rip, so hang two full-width courses. Board horizontally across the studs and stagger the vertical joints.
How much joint compound and how many screws?
About 2 gallons of compound and 481 screws for this room, plus 1 roll of tape. Buy a little more mud than the figure: a second coat always drinks more than the first, and running out mid-pass leaves a ridge you have to sand flat.
Should I hang drywall horizontally or vertically?
Horizontally, across the studs, unless you are using 4 ft × 12 ft sheets at an 8 ft ceiling. Horizontal hanging puts fewer joints in the middle of the wall, and every joint you can put at a height you can reach is a joint that is easier to finish. Vertical hanging is faster to put up and harder to finish.
Other sizes
- How Many Sheets of Drywall for a 10×10 ft Room with an 8 ft Ceiling?
- How Many Sheets of Drywall for a 10×10 ft Room with a 9 ft Ceiling?
- How Many Sheets of Drywall for a 10×10 ft Room with a 10 ft Ceiling?
- How Many Sheets of Drywall for a 12×12 ft Room with an 8 ft Ceiling?
- How Many Sheets of Drywall for a 12×12 ft Room with a 9 ft Ceiling?
- How Many Sheets of Drywall for a 12×12 ft Room with a 10 ft Ceiling?
- How Many Sheets of Drywall for a 10×12 ft Room with an 8 ft Ceiling?
- How Many Sheets of Drywall for a 10×12 ft Room with a 9 ft Ceiling?
- How Many Sheets of Drywall for a 10×12 ft Room with a 10 ft Ceiling?
- How Many Sheets of Drywall for a 12×14 ft Room with an 8 ft Ceiling?