How do I calculate drywall sheets for a room?

Calculate wall area from room perimeter times wall height, add ceiling area if needed, subtract doors and windows, add waste, then divide by sheet coverage and round up.

Should I include waste in drywall estimates?

Yes. A planning estimate commonly includes waste for cuts, damaged board, layout constraints, and site conditions. Verify final quantities before ordering.

Free drywall calculator

Drywall Calculator

Calculate room drywall surface area, waste-adjusted area, and sheet count using room length, width, wall height, ceiling area, openings, and sheet size.

Use calculator Open mobile app page

Calculate drywall sheets

This web version estimates area and boards. The iOS app adds finishing materials, compound, tape, screws, corner bead, and price totals.

352wall sq ft

432drywall sq ft

476with waste

15sheets

Need full takeoffs?

Drywall Material Estimator adds room takeoffs, joint compound, tape, screws, corner bead estimates, and rough cost totals in the mobile app.

View Drywall Material Estimator

Planning note

Coverage and material quantities vary by layout, board size, fastening schedule, local requirements, product coverage, and jobsite conditions.

Drywall calculator FAQ

How is room drywall area calculated?

Wall area is room perimeter times wall height. Ceiling area can be added, and doors/windows are subtracted from the total drywall surface area.

What sheet size does this use?

The default is a 4 ft by 8 ft sheet, but you can change sheet width and length for other board sizes.