How do I calculate drywall sheets?

Calculate net surface area, add waste, then divide by the square footage of one drywall sheet and round up.

What sheet size should I use?

4x8 ft is common for small rooms. 4x10 and 4x12 ft sheets can reduce seams when they are practical to transport and install.

How much waste should I add?

A 10% waste factor is a common starting point. Rooms with many openings, closets or complex cuts may need more.

Is Sheetrock the same as drywall?

Sheetrock is a brand name for gypsum wallboard; drywall is the generic material category.

Drywall Calculator

Estimate drywall sheets, square footage, waste, joint compound, tape, screws and cost for walls, ceilings or room projects.

Drywall material estimate

Estimate one surface at a time. For both sides of a partition, calculate each side or double the area. Ceiling results are planning estimates and should be checked against manufacturer framing specs.

Project type

Wall dimensions, ft

Wall length

Height

Drywall sheet size

Openings, sq ft

Waste factor, %

Price per sheet, $/sheet

Estimate drywall sheets and materials

English drywall calculator intent is material estimating: total wall or ceiling square footage, openings, sheet size, waste factor and a shopping-list style breakdown for sheets, joint compound, tape and screws.

A_{n e t} = A_{w a l l s} + A_{ce i l in g} - A_{o p e nin g s}

S h ee t s = ⌈ \frac{A _{n e t} ( 1 + w a s t e )}{A _{s h ee t}} ⌉

What the estimate includes

Drywall sheets rounded up to whole panels.
Net square footage after doors, windows or other openings.
Waste factor for cuts, mistakes and layout inefficiency.
Supporting estimates for joint compound, tape and screws when available in the tool.

Planning estimate

Actual material use depends on layout, local code, fire rating, moisture rating, framing spacing and manufacturer installation instructions.

Frequently Asked Questions

Sources and References

Calculations are based on the listed reference sources. Links open in a new tab.

Updated: June 2, 2026

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