Drywall Calculator
Free drywall calculator that turns your wall and ceiling area into the number of sheets, joint compound, and screws you need. Works as a sheetrock calculator for any room with a standard 4×8 panel.
Calculate drywall sheets
How the drywall calculator works
This drywall calculator converts surface area into whole sheets. Take a room with 320 sq ft of wall and ceiling: divide by 32 sq ft per 4×8 sheet to get 10 sheets, add 10% waste, and you order 11 sheets. Because most people call the panels sheetrock, it works just as well as a sheetrock calculator — the brand name does not change the math.
It also bundles the consumables. The drywall mud calculator estimates joint compound at about 0.05 gallons per sheet, and you will use roughly 32 screws per sheet. For budgeting, the drywall cost calculator multiplies the sheet count by your price per sheet.
Sheet sizes, mud and screws
Bigger sheets mean fewer seams to tape. A 4×8 panel covers 32 sq ft; a 4×12 covers 48 and is popular on long walls. Whichever you choose, plan on about 0.05 gallons of joint compound and 32 screws per sheet. If you are pricing out a remodel, the drywall installation cost calculator view starts from these material counts before you add labor and finishing.
How to use this calculator
- Measure walls and ceilings. This drywall calculator starts with the total surface area in square feet. Multiply each wall height by its length, add the ceiling, and sum them. There is no need to subtract small openings.
- Pick your sheet size. Enter the coverage per sheet. As a sheetrock calculator it defaults to a 4×8 panel at 32 sq ft, but you can switch to 4×12 sheets at 48 sq ft to cut down on seams.
- Add waste and get sheets. The drywall calculator multiplies by a 10% waste factor for cutouts and offcuts, then rounds up to whole sheets so you have enough to finish the room.
- Estimate mud, screws and cost. The drywall mud calculator built in estimates joint compound at about 0.05 gallons per sheet and roughly 32 screws per sheet, and the drywall cost calculator multiplies sheets by your price per sheet.
Frequently asked questions
Is this the same as a sheetrock calculator?
Yes. Sheetrock is a brand of drywall, so this sheetrock calculator uses the same area-divided-by-sheet-coverage math with a 4×8 panel at 32 sq ft.
How does the drywall mud calculator estimate compound?
It uses about 0.05 gallons of joint compound per sheet, which covers taping and a couple of finish coats for typical rooms.
How many screws per sheet?
Plan on roughly 32 screws per 4×8 sheet, spaced around the edges and through the field into the studs.
Should I subtract windows and doors?
For a quick drywall calculator estimate, no — the 10% waste factor covers cutouts and offcuts. Subtract only very large openings.
What does the drywall cost calculator include?
Sheets times your price per sheet. Joint compound, tape, screws, and labor are separate, which the drywall installation cost calculator view would add.
Sheets by area and panel size
| Area (10% waste) | Panel | Sheets |
|---|---|---|
| 320 sq ft | 4×8 (32) | 11 sheets |
| 640 sq ft | 4×8 (32) | 22 sheets |
| 640 sq ft | 4×12 (48) | 15 sheets |
Larger panels reduce seams but are heavier and harder to handle solo.