Does it include the ceiling?
The ceiling is controlled independently with the Include ceiling checkbox, so you can calculate walls only or walls plus ceiling.
MAXScanner calculator
Drywall Calculator — Sheets, Area & Waste
Estimate drywall sheets from rectangular room wall dimensions with an optional ceiling, subtract openings, add waste and use the entered sheet coverage.
Result
15 sheets
432 ft² net · 475.2 ft² with waste
Ceiling included · sheet coverage 32 ft² · waste 10%.
Formula and worked example
Net area = wall area + optional ceiling area − openings; sheets = ceil(net area × (1 + waste%) ÷ sheet area).
A 12 × 10 ft room with 8 ft walls has 352 ft² of walls plus 120 ft² ceiling before openings.
Assumptions
- Room is modeled as a rectangle.
- Openings are entered as total area and waste is applied after subtracting them.
Last updated: 2026-09-16
Frequently asked questions
Are sheets rounded up?
Yes, because the result represents whole purchasable sheets.