Drywall Calculator
Sheets, screws and compound needed.
Enter your values
Results update instantly as you type — no submit needed.
Results
- Sheets needed
- 21
- Total area with waste
- 642 sq ft
- Screws (approx.)
- 756
- Joint tape
- 257 ft
- Joint compound
- 34 gallons
Quick answer
Divide total wall and ceiling area by the sheet size, then add 10% waste plus screws, tape and compound.
How to use the Drywall Calculator
- 1Measure room length, width and wall height.
- 2Choose the sheet size you will buy.
- 3Include the ceiling if you are boarding it.
Frequently asked questions
Should I subtract windows?
Only for large openings — the waste allowance usually covers small ones.
Which thickness?
1/2 inch for walls, 5/8 inch for ceilings and fire-rated assemblies.