Material calculator
Drywall Calculator
Estimate drywall sheets for rooms, walls, ceilings, or basement projects with openings and waste.
These results are planning estimates only. Verify product labels, site conditions, local requirements, and professional guidance before buying or building.
Calculator inputs
Adjust the typical defaults below. Results update automatically.
Results
Review quantities, warnings, and the shopping list before buying.
Drywall area
302sq ft
Area with waste
332.2sq ft
Sheet size
4 ft x 8 ft
Sheets to buy
11sheets
Material list
- 11 sheets Drywall sheets4 ft x 8 ft
- 332.2 sq ft Drywall area with waste
- Verify separately Joint compound, tape, screws, corner beadNot calculated in MVP
Breakdown
| item | wallAreaSqFt | ceilingSqFt | openingsSqFt | drywallAreaSqFt |
|---|---|---|---|---|
| Room 1 | 352 | 0 | 50 | 302 |
How to use
- Enter room dimensions, openings, and ceiling choice.
- Choose a sheet size or enter custom sheet dimensions.
- Review sheets needed and optional user-entered material cost.
Input guide
- Default openings use 20 sq ft per door and 15 sq ft per window.
- Sheet area is width x length in feet.
- Waste covers cuts and breakage, not layout optimization.
Common mistakes
- Forgetting ceiling area.
- Using sheet dimensions in inches instead of feet.
- Expecting the sheet count to cover finishing compound or tape.
Assumptions and limitations
- No fire-rated drywall, moisture-rated drywall, local code, framing, finishing level, or installation method judgment is included.
- Opening deductions are estimates.
- Optional price is user-entered only.
Formula
- Wall area = 2 x (length + width) x height.
- Drywall area = wall area + optional ceiling area - openings.
- Area to buy = drywall area x (1 + waste percent / 100).
- Sheets needed = area to buy / sheet area, rounded up.
Example
A 12 ft x 10 ft x 8 ft room with ceiling included has 472 sq ft before openings. With one door, two windows, and 10% waste, 15 sheets of 4 ft x 8 ft drywall are estimated.
FAQ
Does this include joint compound and tape?
No. The material list notes them as related supplies, but quantities are not calculated in the MVP.
Can I use custom sheet sizes?
Yes. Enter the sheet width and length if your product differs from the defaults.