Drywall Calculator
Calculate drywall sheet quantity, cuts, tape, compound and fasteners from a generated wall or room layout.
Build your plan
Project inputs
Openings
Material assumptions
Materials, cuts & export
Calculated live
Materials
Live geometry
Wall A
Drag to pan · Drag an opening to move it · Tab to select a sheet or opening
- Purchased sheets
- 22
- Layout sheets
- 20
- Spare stock after rounding
- 2 (10%)
- Full / cut
- 13 / 7
- Geometric waste
- 8.7%
- Coverage
- 583.9 sq ft
- Seams
- 116 ft
Materials
- Joint tape
- 127.6 ft
- Joint compound
- 7.01 gal
- Fasteners
- 704 (estimate)
- Corner bead
- 4 outside corners
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.
Example: a room with walls and ceiling
Totals include all four walls and the ceiling. The drawing shows Wall A. Full sheets, cut sheets and spare allowance are counted separately. The estimate does not reuse leftovers across surfaces.
- Layout sheets
- 20
- Full / cut sheets
- 13 / 7
- Geometric waste
- 8.7%
- Extra stock after rounding (10%)
- 2
- Sheets to buy
- 22
Before you order
Confirm sheet specification
Check thickness, sheet type, fire-rated assemblies and local requirements with your installer.
Check framing and delivery
Verify edge support and openings. Make sure longer sheets fit the delivery route and can be handled safely.
Verify finishing materials
Check tape, compound and fastener coverage. Geometric waste and spare stock are separate estimates.
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.
Planning guides
Put this tool to work
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