ToolnozaCONSTRUCTION TOOL
Drywall Calculator
Estimate drywall sheets for walls and ceilings after subtracting openings and adding a configurable waste allowance.
Drywall Calculator
FREE ONLINE TOOLSTEP BY STEP
How to use drywall calculator
- Check the input units and assumptions.
- Review the result and example.
IN PRACTICE
Example
Suppose walls and ceiling total 472 ft² and doors/windows account for 40 ft². Net area = 432 ft². With 10% waste, adjusted area = 475.2 ft². Using 4 × 8 ft sheets: 475.2 ÷ 32 = 14.85, so estimate 15 sheets.
GOOD TO KNOW
Which assumptions should I check?
Real layouts depend on stud spacing, board orientation, staggered joints, fire or moisture-rated assemblies and local code. Small openings may not save a full board because surrounding pieces still have to be cut. The calculator estimates panels only; compounds, tape, screws and corner bead are separate.