The Sheetrock Calculator tells you how many sheets you need for a room, based on wall dimensions and sheet size. Simply fill in the fields above and click Calculate to get an instant result.
This calculator is part of Calculate Wiki’s Construction Calculators collection.
What You’ll Need
- Total Wall Length (combined)
- Wall Height
- Sheet Width and Sheet Length
- Waste Allowance
Formula Used
Wall area = Combined length × Height
Sheets needed = (Wall area × (1 + Waste%)) ÷ Sheet area
Example Calculation
Using example inputs — Combined Length = 40 ft; Height = 8 ft; Sheet = 4 ft × 8 ft; Waste = 10% — the Sheetrock Calculator returns:
| Value | Result |
|---|---|
| Wall area | 320 sq ft |
| Total area (with waste) | 352 sq ft |
| Sheets needed | 11 |
11 sheetrock sheets needed.
Helpful Information
Results from the Sheetrock Calculator are estimates based on standard formulas used in the construction calculators field. Doesn’t account for door/window cutouts, which can slightly reduce the sheet count.
Frequently Asked Questions
Is the Sheetrock Calculator free to use?
Yes — the Sheetrock Calculator on Calculate Wiki is completely free, with no sign-up required.
How accurate is the Sheetrock Calculator?
The Sheetrock Calculator uses a standard, well-documented formula from the construction calculators field. Results are for informational and planning purposes.
Can I use this on my phone?
Yes, this calculator is fully mobile-friendly and works on any modern browser.
What does the result mean?
For the example values shown above (40 ft combined wall length, 8 ft height), you’d need 11 sheets of 4×8 ft sheetrock.