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Drywall Calculator

Estimate how many drywall sheets, screws, and how much joint tape you need for a room, based on wall area and a standard waste allowance.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.1.0

Market
Imperial · sales tax
13.12 ft11.48 ft
Schematic, drawn to the proportions you entered — not to scale on screen.
Who is doing the work?

The standard allowance most suppliers and estimating guides assume for ordinary work.

Estimated drywall needed

12 sheets (4x8 ft)

High confidence
Gross wall area
387.5 ft²
Doors + windows area (subtracted)
51.13 ft²
Net wall area
336.37 ft²
Area with waste factor
370.01 ft²
Joint tape needed
124.46 linear ft
Drywall screws needed
384 screws

At the values currently entered, the result works out to 12 sheets (4x8 ft). Figures are shown for United States, where IRC 2024 is the governing residential reference; switch the market above if you are building elsewhere.

Estimated cost

$144 - $252

  • Drywall sheet (material only)$144 - $252

Estimated national-average pricing, adjusted by a rough regional multiplier — not a quote and not verified for your specific location or supplier. Last verified 2026-08-25.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • Standard drywall sheet size is 4 ft x 8 ft (32 sq ft / 2.973 m²) — the most common size sold for wall installation
  • 10-15% waste factor is standard industry practice for rooms with doors, windows, and outlet cutouts
  • Joint tape: approximately 370 linear ft per 1,000 sq ft of drywall area (common manufacturer/retail estimating rule); screws: approximately 32 per standard 4x8 sheet on 16 in o.c. framing

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

Does this include the ceiling?
No — this estimates wall sheets only. Add the ceiling's square footage separately (divided by 32 sq ft per sheet) if you're drywalling the ceiling too.
Why round up to whole sheets?
Drywall is sold in full sheets — you can't buy a fraction of one, so the estimate always rounds up.
What waste factor should I use?
10% for a simple rectangular room, 15% for rooms with lots of corners, angles, or if this is your first drywall job.
Does this account for a specific drywall thickness?
No — sheet count depends only on area covered, not thickness. Thickness (e.g. 1/2 in vs 5/8 in) affects weight and fire rating, not how many sheets you need.
What about joint compound (mud)?
Use the dedicated Drywall Joint Compound Calculator — mud coverage depends on the number of coats and finish level, which deserves its own dedicated inputs rather than a rough add-on here.