Drywall and sheetrock calculator
Estimate drywall sheets for rectangular wall and ceiling surfaces. Enter dimensions from reviewed plans, deduct the openings you choose to exclude, set the number of layers and add a quantity allowance. The worksheet shows the calculation for each surface and exports the entered basis with the result.
Units on each line
Every length on a line uses the unit selected for that line. Feet uses square feet for openings; meters uses square meters. Changing a line’s unit reinterprets the numbers already entered; it does not convert them, so update the surface and sheet dimensions too. Do not mix feet and inches on one line: for 9 feet 6 inches, enter 9.5 ft. Metric users enter all lengths in meters, for example a 1.2 × 2.4 sheet.
Use 0.5 rather than .5; do not include commas or unit text. Values may have up to six decimal places.
Walls and ceilings quantity worksheet
Add one line for each wall face or ceiling area. Keep different sheet sizes or board assemblies on separate lines. This is an area-based planning calculation, not a cut-layout or purchasing instruction.
The worksheet does not choose board type, thickness, fire or acoustic assembly, framing, fastening or finish materials. It does not lay out cuts or reuse offcuts between surfaces. Confirm the specification and ordering quantities with the responsible estimator and supplier.
Total sheets may include different sheet sizes. Review each line separately before ordering.
How to calculate drywall for walls and ceilings
- Measure each wall face as length × height. Use another line for the other side of a partition; entering two layers means two board layers on the same face, not both sides of a wall.
- Measure each rectangular ceiling as length × width. Divide irregular geometry into nonoverlapping rectangles or use an independently measured area basis; this worksheet does not interpret plans.
- Enter the combined area of openings you intend to deduct on that surface. Deduct each physical opening once, before applying board layers. Whether to deduct an opening depends on your takeoff and cutting approach; small openings do not necessarily reduce purchased sheets.
- Enter the required number of layers and the actual sheet dimensions. Confirm them from the applicable specification; the calculator does not select an assembly.
- Enter an allowance appropriate to the cutting, handling and ordering plan. The sample 10% is editable and is not a universal recommendation.
- Review each rounded sheet count, the sheet size and the combined count before carrying quantities into an estimate.
Formula and worked example
- Gross area = surface length × wall height or ceiling width.
- Net area = gross area − entered opening area.
- Layered area = net area × number of layers.
- Area with allowance = layered area × (1 + allowance / 100).
- Sheets for each surface = round up (area with allowance ÷ area per sheet).
- Total sheets = sum of the sheet counts already rounded for each surface.
A 20 ft × 10 ft wall face has 200 ft² of gross area. Deducting 20 ft² of openings leaves 180 ft². With one layer and a 10% allowance, the planning area is 198 ft². A 4 ft × 8 ft sheet covers 32 ft², so 198 ÷ 32 = 6.1875, rounded up to 7 sheets. A 20 ft × 12 ft ceiling at the same allowance needs 9 sheets. These two lines total 16 sheets. This is an illustrative calculation, not an installation recommendation.
Why the sheet count can differ from an order
Area alone cannot describe every cut. Sheet orientation, seams, room geometry, openings, handling damage and usable offcuts affect an order. This tool rounds each surface separately and does not assume offcuts move between lines. That can be conservative, while an awkward cutting layout can still need more material. Check the layout and supplier packaging before ordering.
Different dimensions or layers belong on separate lines. The combined count may include several sheet sizes; it is not a single stock item. The CSV contains values rather than a recalculating workbook. Displayed and exported areas round to six decimal places, while whole-sheet rounding uses the exact entered decimal values.
Does this include both sides of a wall?
No. Each wall line represents one face. Add the opposite face as another line when it is part of the scope. Layers applies to the number of boards covering each face.
Can I estimate joint compound, screws or installation cost here?
No. Those quantities and costs depend on the specified assembly, fastening and finish requirements, labor assumptions and supplier information. This worksheet estimates board area and whole sheets only.
Keep the takeoff connected to the estimate
Use the surface reference to retain the room, drawing or cost-code context. Review the quantities in your takeoff and estimating workflow, then carry accepted scope and pricing assumptions into construction cost management. For concrete or asphalt volume, use the construction material quantity calculator.
For measurement steps, a worked example and a CSV template, read how to do a construction takeoff.
USG’s Sheetrock estimator also distinguishes panel-size area estimates from installation-specific quantities and notes that its estimates exclude waste. This Jet.Build worksheet uses your own editable allowance and does not reproduce USG accessory rates.