Drywall
Drywall Calculator
Estimate drywall sheet count for room walls, with an option to include the ceiling and choose common sheet sizes.
Drywall
Calculator inputs
Drywall Calculator Results
Results update in your browser as you edit inputs. They are planning estimates, not complete shopping lists.
Enter project dimensions to calculate material quantity.
Assumptions
- The room is treated as a rectangle.
- Openings, seams, orientation, fasteners, mud, tape, and corner bead are not included.
- Sheet counts are rounded up to whole sheets.
- Waste is applied after rounding the base sheet count, so the estimate may be slightly conservative for small rooms.
- Any cost estimate uses only the unit price you enter. No store or local price data is used.
Formula
- Wall area = 2 x (room width + room length) x wall height.
- Ceiling area = room width x room length if included.
- Base sheets = ceil(total area / sheet area).
- Sheets including waste = ceil(base sheets x (1 + waste factor)).
Example calculation
Example: 12 x 12 room with ceiling
A 12 ft by 12 ft room with 8 ft walls has 384 sq ft of wall area plus 144 sq ft of ceiling area. With 4 x 8 sheets, that is 17 sheets before waste.
Common mistakes
- Forgetting the ceiling when it is part of the job.
- Assuming sheet count also covers joint compound and tape.
- Ignoring transport limits for longer sheet sizes.
FAQ
Does this include drywall mud and tape?
No. It estimates sheet quantity only.
Which sheet size should I choose?
Use the sheet size you plan to buy and can safely transport and handle.