Drywall Calculator - Estimate Sheets, Screws, and Mud

Calculate the exact number of drywall sheets, joint compound, tape, and screws for your project. Accounts for walls, ceilings, openings, and waste factor.

Project Inputs

Feet and square feet measurements keep the material totals aligned with contractors' quantities.

Adds the planar ceiling area to the total.

How to Use This Calculator

Gather your wall perimeter and height, subtract openings, and let the calculator project the material counts for the selected sheet size.

  • Enter the total wall perimeter and room height in feet.
  • Toggle the ceiling option and add ceiling square footage if you are covering the ceiling as well.
  • Deduct large openings (doors, windows) so materials are not double-counted.
  • Adjust the wastage factor to reflect how tightly you plan to hang and finish the boards.
  • Select the drywall sheet size that matches your deliverable (4×8, 4×10, or 4×12).

Methodology

We compute the wall area, optionally add ceiling area, subtract openings, and then inflate the net exposure by the wastage percentage. Total drywall sheets are rounded up to the next whole board, while finishing materials follow trade heuristics: 1.5 gallons of compound and 1 pound of screws per 100 square feet, and one roll of 500 ft tape per 500 square feet.

  • Net area refuses to go negative; if openings exceed gross area an error prompts you to revisit the inputs.
  • Materializing ceilings and high wastage percentages is intentionally deliberate for conservative ordering.
  • Results reflect typical contractor coverage estimates, not structural design rules.

Full original guide (expanded)

The legacy audit, sources, and changelog are preserved verbatim in the metadata below so you can trace every formula, reference, and change log entry from the original drywall calculator.

Formulas

Material estimate formulas

Wall area
\[A_{wall} = \text{Wall Perimeter} \times \text{Room Height}\]
A_{wall} = \text{Wall Perimeter} \times \text{Room Height}
Gross area
\[A_{gross} = A_{wall} + A_{ceiling}\]
A_{gross} = A_{wall} + A_{ceiling}
Net area
\[A_{net} = \max(0, A_{gross} - A_{openings})\]
A_{net} = \max(0, A_{gross} - A_{openings})
Total area with wastage
\[A_{total} = A_{net} \times \left(1 + \frac{\text{Wastage \%}}{100}\right)\]
A_{total} = A_{net} \times (1 + \frac{\text{Wastage \%}}{100})
Drywall sheets
\[N_{sheets} = \left\lceil \frac{A_{total}}{A_{sheet}} \right\rceil
N_{sheets} = \lceil \frac{A_{total}}{A_{sheet}} \rceil
Compound, screws, tape heuristics
Compound = 1.5 gal / 100 sq ft, Screws = 1 lb / 100 sq ft, Tape = 1 roll / 500 sq ft
Compound = \frac{A_{total}}{100} \times 1.5
Screws = \frac{A_{total}}{100} \times 1
Tape = \left\lceil \frac{A_{total}}{500} \right\rceil
Citations
Changelog
  • 0.1.0-draft — 2026-01-19: Initial draft (review required).
    • Initial audit spec draft generated from HTML extraction (review required).
    • Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
    • Confirm sources are authoritative and relevant to the calculator methodology.
✓ Verified by Ugo Candido Last Updated: 2026-01-19 Version 0.1.0-draft
Version 1.5.0