Free US quantity worksheet
Drywall Calculator for Area-Based Sheet Planning
Estimate whole drywall sheets from room dimensions or gross surface area. Subtract openings, enter the layer count and actual sheet size, then add your chosen allowance. This estimates area coverage rather than a cutting or installation layout.
Starting figures illustrate the calculation. Replace them with verified measurements and the actual product details. Allowances are your choice, not a recommended rate.
Your quantity result
- Net surface area (sq ft)
- 432
- Area including entered layers (sq ft)
- 432
- Area per sheet (sq ft)
- 32
- Whole sheets before allowance
- 14
- Whole sheets with allowance
- 15
Area-based sheet planning, not a cut layout or assembly design. The same entered layer count applies to all counted surfaces. Panel thickness, fire/moisture rating, framing, fastening and finishing requirements are not selected here.
Calculations stay in this browser. No signup or email is needed.
Convert the counted surface into sheet area
For a rectangular room, walls = 2 × (length + width) × height. Include length × width for the ceiling only when selected. Subtract opening area once, then multiply net area by the same entered layer count for all counted surfaces.
Area per sheet = sheet width in feet × sheet length in feet. Whole sheets with allowance = round up (net area × layers × (100 + allowance %) / (100 × sheet area)). A 4 ft by 8 ft example sheet has 32 sq ft of area.
A 12 ft by 10 ft room with 8 ft walls and its ceiling included has 472 sq ft before openings. Subtracting 40 sq ft gives 432. One layer, 4 ft by 8 ft sheets and a chosen 10% allowance gives 15 whole sheets in this area model.
Sheet area does not specify the wall or ceiling assembly
Confirm actual panel dimensions and the product specification. Different surfaces, ratings or layer requirements should be calculated separately instead of forcing them into one room assumption.
The tool does not plan seams or offcut reuse, account for curved or sloped surfaces automatically, choose thickness or fire/moisture ratings, or count framing, screws, tape and compound. A percentage allowance cannot prove that a particular layout or rated assembly is correct.