Calculate your drywall needs
Planning estimate. Door/window areas use standard assumptions; stud and screw counts are approximate. Confirm sheet sizes, framing rules and manufacturer instructions.
How to use the drywall calculator
- Measure the room. Enter length, width and wall height.
- Add openings. Enter doors and windows so their estimated areas can be deducted.
- Choose the sheet size. Select a common sheet size for your project.
- Include ceiling and layers if needed. The calculator adds these to the planning quantity.
- Add waste. Use an allowance appropriate for your layout and project.
Example: how many drywall sheets do I need?
For a simple 12 ft × 10 ft room with 8 ft walls, one door, two windows and 10% waste, the calculator estimates the planning quantity based on the selected 4 × 8 ft sheet size.
Frequently Asked Questions
How do I calculate how many sheets of drywall I need?
Calculate the wall area, subtract the estimated door and window areas, add any ceiling area, account for layers and waste, then divide by the selected sheet coverage and round up.
How much drywall do I need for a room?
It depends on room dimensions, openings, ceiling coverage, sheet size, number of layers and waste.
Should I include waste when buying drywall?
Yes. Cuts, openings and layout can create waste, so include a planning allowance.
Can I use this drywall calculator for ceilings?
Yes. Turn on the ceiling option to include the room ceiling in the planning area.