Quantity + materials
Drywall Calculator
Calculate drywall sheet quantity, cuts, tape, compound and fasteners from a generated wall or room layout.
Enter a room or wall, pick a sheet size, and get purchased sheets plus planning estimates for tape, compound and screws.
Start planningBuild your plan
Project inputs
Live geometry
Wall A
Drag to pan · Drag an opening to move it · Tab to select a sheet or opening
Calculated live
Materials
- Purchased sheets
- 22
- Layout sheets
- 20
- Full / cut
- 13 / 7
- Geometric waste
- 8.7%
- Coverage
- 583.9 sq ft
- Seams
- 116 ft
Materials
Planning estimates only. Confirm product coverage, fire-rated assemblies and local requirements before ordering.
Compare layouts
| Horizontal | Vertical | |
|---|---|---|
| Sheets | 4 | 3 |
| Waste | 25% | 0% |
| Seams | 20 ft | 16 ft |
| Cuts | 2 | 0 |
Auto picks the lower planning score for Wall A. Other surfaces keep their own recommendation.
Export your plan
See the actual sheet layoutPlanning guide
Built to explain the sheet layout, not hide it behind a single total.
Quantity from geometry, not from 32 sq ft
A typical drywall calculator divides wall area by the face of a 4×8 sheet and adds a percentage. That misses orientation, extra sheets created by leftover strips, and openings that still consume a full board. This calculator runs the same layout engine as the planner, then totals full sheets, cut sheets and purchase allowance.
Tape is estimated from calculated seam length, not from square footage alone. Compound and fasteners use editable assumptions so you can match a product coverage chart without pretending BuildPlot inspected the job.
Example
A 12 by 14 by 8 foot room with 4×8 sheets produces four walls and a ceiling. Compare Auto against a forced horizontal hang if you want fewer seams on the long walls. Then open the full planner to see which wall is driving the cut count.
BuildPlot provides planning estimates and layout assistance. Actual installation requirements depend on framing, product specifications, local building codes, fire-rated assemblies, site conditions and manufacturer instructions. The current planner supports rectangular rooms and single walls. Current limitations: it does not check fire ratings, reuse offcuts across walls, or replace a contractor takeoff.
Common questions
Drywall planning FAQ
How much drywall do I need for a 12x12 room?
It depends on ceiling height, openings and sheet length. Enter the room and generate the layout rather than using a single square-foot rule.
Does the calculator include the ceiling?
Yes in Room mode. Single-wall mode plans one surface only.
How is joint tape estimated?
From the seam length in the generated layout, plus the tape reserve percentage in Material assumptions.
Are screw counts a code requirement?
No. They follow the screws-per-sheet assumption you enter.
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