How much drywall do I need?
Enter your room size to get the sheets, joint compound, tape, and screws you need — plus the installed cost with labor. Full materials bill, brand-neutral rates, free, no signup.
Short answer
To estimate drywall, take the wall area (perimeter × ceiling height) plus the ceiling, divide by the sheet size (32 sq ft for a 4×8), and add ~10% for waste. A 12×15 room with an 8-ft ceiling is about 612 sq ft — roughly 22 sheets — and costs about $1,300–$2,400 installed. Plan ~0.5 gal of joint compound and ~40 ft of tape per sheet.
4×8 sheet
32 sq ft
also 4×10, 4×12
Waste
~10%
for cuts
Installed
$1.50–$3.50
per sq ft
Per sheet
~0.5 gal
mud + 40 ft tape
Drywall sheets & installed cost by size — 12×12 room (2026)
| Sheet size | Coverage | Price per sheet | 12×12 room (walls + ceiling) | Installed cost |
|---|---|---|---|---|
| 4' × 8' | 32 sq ft | $12–$18 | 19 sheets | $1,063–$2,268 |
| 4' × 10' | 40 sq ft | $15–$22 | 15 sheets | $1,060–$2,256 |
| 4' × 12' | 48 sq ft | $18–$27 | 13 sheets | $1,069–$2,277 |
Installed cost = sheets + joint compound + tape + screws + hung-taped-finished labor at $1.50–$3.50/sq ft, 2026 national ranges. The 12×12 example assumes 8-ft ceilings, ceiling included, 10% waste.
Drywall cost by area
How we calculate this
Every number on this page comes from the same formulas the calculator runs — the full materials bill, not just a sheet count:
- Drywall area. wall perimeter × height, plus the ceiling if included, minus 21 sq ft per door and 15 sq ft per window.
- Sheets. area × 1.1 (10% waste) ÷ the sheet's coverage (32, 40, or 48 sq ft), rounded up.
- Joint compound (mud). about 0.5 gallon per 32 sq ft of installed drywall, bought in 4.5-gal boxes.
- Tape and screws. about 40 ft of tape and 32 screws per 4×8 sheet-equivalent (screws ~300 per lb).
- Installed cost. materials plus hung, taped, and finished labor at $1.50–$3.50 per square foot.
Assumptions
- Standard ½″ drywall on framed walls; moisture- or fire-rated board costs more per sheet.
- Consumables scale with net installed area — waste offcuts don't consume mud or tape.
- Labor range is national mid-range for hang + tape + level-4 finish — validate locally.
Sources
Last reviewed: July 13, 2026
Related tools
Frequently asked questions
How much drywall do I need?
Measure the wall area (perimeter × ceiling height) plus the ceiling if you are drywalling it, then divide by the sheet size — 32 sq ft for a 4×8 — and add about 10% for waste. A 12×15 room with an 8-ft ceiling is about 612 sq ft, or roughly 22 sheets of 4×8. Enter your room above for the exact sheets, mud, tape, and screws.
How much is a sheet of drywall?
A standard 1/2-inch 4×8 sheet runs about $12–$18. Larger 4×10 and 4×12 sheets cost more each but cover more area and leave fewer seams to tape. Installed labor adds roughly $1.50–$3.50 per square foot.
How much does it cost to install drywall?
Hanging and finishing drywall runs about $1.50–$3.50 per square foot installed, materials plus labor, at a standard Level 4 finish. A 12×15 room is roughly $1,300–$2,400 installed. Level 5 finish, texture, and high ceilings cost more.
How much joint compound, tape, and screws do I need?
Plan on roughly half a gallon of joint compound (mud) and about 40 linear feet of tape per 4×8 sheet for a standard three-coat finish, plus about 32 screws per sheet. The calculator totals all three from your area.
Should I use 4×8, 4×10, or 4×12 sheets?
Bigger sheets mean fewer seams to tape and finish, which is faster and looks better — pros often use 4×12 on long walls and ceilings. They are heavier and harder to handle in tight spaces, where 4×8 is easier. The calculator adjusts sheet count for whichever you pick.