Drywall Calculator
Estimate drywall sheets, joint compound, tape rolls, and screw count from room dimensions, openings, and sheet size.
Last updated: 2026-03-25
Drywall calculator
Enter your values
Estimate sheets and finishing accessories before you buy more drywall than the room actually needs.
Drywall Order
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Enter room size, openings, and sheet size to estimate drywall materials.
Calculation History(0)
Example calculations
Tap an example to prefill the calculator with sample values.
Bedroom walls
15 x 12 room with one door and two windows
A basic room estimate where openings matter but waste allowance still drives the final sheet count.
Result: Opening deductions help, but waste and whole-sheet rounding still push the order higher than net wall area suggests.
Garage finish-out
Longer walls using 4 x 12 sheets
Larger sheets can reduce seams and screw count when ceiling height still fits the panel size efficiently.
Result: Bigger sheets typically reduce joints, but the total surface area still dominates the order size.
Basement room split
Compact footprint with more openings
Useful for seeing how much doors and windows actually change sheet count on smaller wall areas.
Result: Openings reduce area, but the job still rounds to full sheets and accessories.
How the drywall estimate works
The calculator multiplies room perimeter by wall height to get gross wall area, then subtracts standard door and window deductions to approximate net coverage.
That net area is increased by a waste allowance and divided by the chosen sheet size, then rounded up to whole panels because drywall is bought sheet by sheet.
Drywall calculator FAQs
How wall area, openings, and panel size affect sheet counts and accessories.
Why does sheet size matter beyond total area?
Because larger sheets cover more surface and reduce seams. That usually trims joint count, tape, and fasteners even if the wall area stays the same.
Are door and window deductions exact?
No. They are standard planning deductions for typical openings. Custom windows, soffits, and partial-height walls should be field-measured separately.
Does this include ceilings?
No. This estimate is for wall coverage only. Ceiling drywall should be measured as a separate surface so sheet orientation and height assumptions stay clear.
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</script> Related tools
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