Sheetrock Calculator
Frequently Asked Questions
How do I estimate sheetrock for a room?
To estimate sheetrock needs:
- Measure room length, width, and height
- Calculator finds total wall area (perimeter × height)
- Add ceiling area if needed (length × width)
- Include 10-15% waste for cuts and mistakes
What size sheetrock should I use?
Common sheet sizes and uses:
- 4×8 ft — Most common, easy to handle
- 4×12 ft — Fewer seams, needs two people
- 2×8 ft — Small repairs, tight spaces
Why add a waste factor?
Waste factor accounts for:
- Cuts around doors and windows
- Electrical boxes and fixtures
- Damaged sheets during install
- Odd-shaped areas and corners
10% is typical, use 15% for complex rooms.
Does this account for doors and windows?
This calculator estimates total wall area. For more accuracy:
- Standard door: subtract ~20 sq ft
- Standard window: subtract ~12 sq ft
- Or let the waste factor absorb small openings