Fidamen

Drywall Sheets Calculator

This estimator helps contractors, remodelers, and DIYers calculate drywall sheet quantities, basic accessory counts, and an initial material cost estimate from a few simple measurements: combined wall length, wall height, sheet size, openings, and a chosen waste allowance.

Results are conservative, rounded to whole sheets for purchasing, and include a configurable waste percentage to account for cuts, mistakes, and non-rectangular walls. Use the total wall length field to handle multiple rooms or irregular layouts by entering the sum of all wall runs.

Updated Nov 12, 2025QA PASS — golden 25 / edge 120Run golden-edge-2026-01-23

Governance

Record 2d07f07b8e34 • Reviewed by Fidamen Standards Committee

Inputs

Results

Updates as you type

Total wall area (sq ft)

300

Single sheet area (sq ft)

32

Sheets required (raw, no waste)

9.375

Sheets required (with waste)

10.3125

Sheets to purchase (rounded up)

—

Estimated total material cost

—

Estimated screws/fasteners needed

—

Estimated tape length (ft)

—

OutputValueUnit
Total wall area (sq ft)300sq ft
Single sheet area (sq ft)32sq ft
Sheets required (raw, no waste)9.375—
Sheets required (with waste)10.3125—
Sheets to purchase (rounded up)—sheets
Estimated total material cost—USD
Estimated screws/fasteners needed——
Estimated tape length (ft)—ft
Primary result300

Visualization

Methodology

Area-based approach: the tool computes wall surface area (linear wall length × height), subtracts openings (doors/windows), and divides by the selected sheet area. A waste allowance is applied and the final purchase quantity is rounded up to whole sheets.

Accessory estimates (screws, tape) are derived from typical coverage rates and sheet counts to provide quick procurement guidance. Cost is a simple multiplication of sheets-to-buy × cost-per-sheet and does not include delivery, fasteners, joint compound, or labor.

This estimator is intended for planning and purchasing. For final takeoffs on commercial jobs or code compliance, cross-check with project drawings and local building codes.

F.A.Q.

How do I measure total wall length for multiple rooms?

Measure each wall run (inside face-to-face) and add them together. Include closets and partial walls that will be drywalled. Do not include openings you plan to leave exposed; instead, add their areas in the openings field to subtract them from the total area.

What waste percentage should I use?

Typical waste allowances are 5–10% for simple rectangular rooms and 10–15% for rooms with many corners, soffits, or awkward openings. For complex layouts or ceilings, consider 15–20%.

Can I use metric measurements?

This estimator uses feet and square feet. Convert metric measurements to feet before entering values. For professional workflows, use project takeoff tools that support metric units and detailed nesting of rooms.

How accurate is the tape and screws estimate?

Tape and fastener counts are conservative approximations based on sheet counts and common trade practices. Final quantities will vary with fastening patterns, stud spacing, and finishing level (tape only, skim coat, etc.).

Does the cost include joint compound, corner bead, or labor?

No. The cost shown is only a basic multiplier of sheets-to-buy × cost-per-sheet. Add separate line items for joint compound, corner bead, screws, tools, waste disposal, and labor in your final budget.

Is this tool suitable for commercial code compliance?

Use this estimator for preliminary procurement planning. For code compliance, fire-rating, acoustics, or engineered assemblies, consult project specifications and local building officials; verify required board types and fastening schedules.

Why do results round up to whole sheets?

Sheets are sold in whole units. The calculator rounds up after applying waste allowance so purchasers order a sufficient number of full sheets to complete the job.

Sources & citations

Further resources

Versioning & Change Control

Audit record (versions, QA runs, reviewer sign-off, and evidence).

Record ID: 2d07f07b8e34

What changed (latest)

v1.0.0 • 2025-11-12 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Public QA status

PASS — golden 25 + edge 120

Last run: 2026-01-23 • Run: golden-edge-2026-01-23

Engine

v1.0.0

Data

Baseline (no external datasets)

Content

v1.0.0

UI

v1.0.0

Governance

Last updated: Nov 12, 2025

Reviewed by: Fidamen Standards Committee (Review board)

Credentials: Internal QA

Risk level: low

Reviewer profile (entity)

Fidamen Standards Committee

Review board

Internal QA

Entity ID: https://fidamen.com/reviewers/fidamen-standards-committee#person

Semantic versioning

  • MAJOR: Calculation outputs can change for the same inputs (formula, rounding policy, assumptions).
  • MINOR: New features or fields that do not change existing outputs for the same inputs.
  • PATCH: Bug fixes, copy edits, or accessibility changes that do not change intended outputs except for previously incorrect cases.

Review protocol

  • Verify formulas and unit definitions against primary standards or datasets.
  • Run golden-case regression suite and edge-case suite.
  • Record reviewer sign-off with credentials and scope.
  • Document assumptions, limitations, and jurisdiction applicability.

Assumptions & limitations

  • Uses exact unit definitions from the Fidamen conversion library.
  • Internal calculations use double precision; display rounding follows the unit's configured decimal places.
  • Not a substitute for calibrated instruments in regulated contexts.
  • Jurisdiction-specific rules may require official guidance.

Change log

v1.0.0 • 2025-11-12 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Areas: engine, content, ui • Reviewer: Fidamen Standards Committee • Entry ID: 2b907fd25c24