Drywall Ceiling Calculator
Estimate ceiling drywall sheets, screws, fastener boxes, perimeter, purchased coverage and material cost for a rectangular room.
Default project preview
11 sheets
Ceiling area
320 ft²
Order coverage
352 ft²
Purchased coverage
352 ft²
Drywall screws
440
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Input and output guide
What each value means
The labels and units below are part of this calculator’s visible methodology. Replace every default with measurements or product data from the actual project.
Ceiling length
Enter this project assumption in ft. The current imperial default is 20 ft.
Ceiling width
Enter this project assumption in ft. The current imperial default is 16 ft.
Drywall layers
Enter this project assumption in a unitless value. The current imperial default is 1. Minimum: 1.
Waste allowance
Enter this project assumption in %. The current imperial default is 10 %. Minimum: 0. Maximum: 50.
Sheet length
Enter this project assumption in ft. The current imperial default is 8 ft.
Sheet width
Enter this project assumption in ft. The current imperial default is 4 ft.
Screws per sheet
Enter this project assumption in a unitless value. The current imperial default is 40. Minimum: 1.
Screws per box
Enter this project assumption in a unitless value. The current imperial default is 200. Minimum: 1.
Price per sheet
Enter this project assumption in a unitless value. The current imperial default is 18. Minimum: 0.
Price per screw box
Enter this project assumption in a unitless value. The current imperial default is 9. Minimum: 0.
How to read the outputs
Ceiling area
single-layer footprint. Default preview: 320 ft².
Order coverage
layers and waste included. Default preview: 352 ft².
Purchased coverage
full sheets. Default preview: 352 ft².
Drywall screws
3 full boxes. Default preview: 440.
Ceiling perimeter
room boundary. Default preview: 72 ft.
Material cost
sheets and screw boxes. Default preview: $225.00.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Order coverage = ceiling length × width × layers × waste factor. Sheets and fastener boxes are rounded up to whole purchasable units.
Reviewed project guidance
How to use this estimate in a real project
Last reviewed: July 30, 2026
Use this calculator to estimate ceiling board area and sheet count. It supports measurement, purchasing and preliminary budgeting, but it does not select assemblies, products, code details or installation methods for the project.
Calculation steps
- 1Measure each project section separately and keep every input in one unit system.
- 2Enter the verified values for ceiling dimensions, sheet size, layout and waste.
- 3Review the raw measured result before applying waste, overlap, labor or price assumptions.
- 4Apply one documented allowance, then divide by the exact package yield or stock length and round up only at the purchasing stage.
Worked numerical example
A 16 ft × 20 ft ceiling has 320 ft² of area; 4 ft × 8 ft sheets cover 32 ft² each, giving a theoretical 10 sheets before layout and cut allowance.
Purchasing and rounding
Choose sheet size and orientation from joist direction, ceiling dimensions and safe handling limits. Round sheet count up after laying out full sheets and unavoidable cut rows; fire-rated or moisture-specific assemblies must use the specified board rather than substituting a cheaper sheet with similar dimensions.
Interpret the result
The theoretical sheet count comes from ceiling area divided by sheet area. A real ceiling can require extra sheets because staggered joints, room shape, openings and damaged edges prevent every offcut from being reused.
Page-specific assumptions
- Dimensions represent the actual installation area or run.
- One product size, package yield and installation condition are used per calculation.
- Allowances are added once and are not already embedded in the measurements.
- Structural, moisture, fire, energy and code requirements are verified separately.
Common mistakes
- Estimating from nominal dimensions instead of field measurements.
- Using package coverage from a different product or installation method.
- Applying waste in both the input dimensions and the allowance field.
- Treating a quantity or cost estimate as approval of the assembly or installation detail.
Primary and technical references
BuildMeter provides planning estimates, not engineering, architectural, electrical, mechanical, plumbing, permit or code approval. Review the methodology and verify final decisions with product documentation and qualified professionals.
BuildMeter Guides
Understand the measurements and assumptions
Use these visible reference guides before changing project inputs or planning allowances.
FAQ
Drywall Ceiling Calculator questions
Should ceiling drywall run perpendicular to framing?+
Layout depends on framing direction, sheet length and the approved assembly. Plan joints before ordering.
Does this include joint compound and tape?+
No. Use the joint-compound calculator for finishing materials.
Why can ceiling screw spacing differ from walls?+
Ceiling panels resist gravity and must follow the fastening schedule for the selected board and framing.