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Drywall Calculator

Sheet counts from wall and ceiling areas, layers and sheet sizes.

Your project

Enter your measurements. Required fields are labeled; assumptions and optional quotes can be edited below.

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Calculator inputs

If an area transfer is unavailable: Copy your area and enter it in the next calculator.

Surface 1
Length Required
Enter whole feet and inches less than 12. One blank component means 0.
Height Required
Enter whole feet and inches less than 12. One blank component means 0.
Use a decimal point. The physical area is preserved when units change.

Optional net-area deduction. Must be less than this rectangle’s gross area; zero is valid.

Up to 20 nonoverlapping rectangles.

Layers, sheet and allowance
1–3 layers from the selected design. This does not approve a fire, acoustic or structural assembly.

Applied preset: US-market. No assumptions changed. Display units do not select a market preset.

US 4×8 ft: 4 ft 0 in × 8 ft 0 in. Display units preserve this physical product.

0–50%. Applies once to the layered net area, before whole-sheet rounding.
Optional cost
Optional supplied price per selected sheet; zero is valid.

How this calculator works

Enter wall or ceiling rectangles with optional deductions, or a measured net area. Choose 1–3 layers from the selected design, a physical sheet product and an allowance. Sum all net areas, multiply by layers, apply waste once, then round to whole sheets. The material-area model assumes potential offcut reuse across surfaces.

Drywall estimate formulasheets = ceil(net area × layers × (1 + waste) ÷ sheet area)

Assumptions and limitations

Openings do not always reduce real sheet use; check physical layout and offcut practicality. US 4×8, 4×10 and 4×12 ft sheets retain their exact physical dimensions through unit changes. Metric 1.2×2.4 m is a separate explicit product. No fastener, tape, finishing compound, seam layout, thickness, moisture suitability or rated assembly approval is estimated.

Allowance is the additional requirement before purchase rounding. Purchase surplus is the capacity bought beyond that adjusted requirement. These are separate quantities. Prices are optional user-entered USD quotes, including valid zero prices; they exclude tax, delivery and labor. Missing prices never imply a free product.

US/Metric changes representation only. An explicit market preset changes its listed product assumptions; it does not change project geometry. Required project measurements begin blank, and every active row must be valid before a result is shown.

Worked examples

DRYWALL-01: A known net 352 ft², one layer and 10% allowance require 387.2 ft². US 4×8 ft sheets give 13 sheets / 416 ft² purchased and 28.8 ft² purchase surplus. At $15/sheet, cost is $195.00.

DRYWALL-02: Surfaces of 5 × 3 m less 2 m² and 4 × 3 m less 1 m² total 24 m² net. Two layers give 48 m². A 5% allowance gives 50.4 m². Metric 1.2×2.4 m sheets cover 2.88 m² each: 18 sheets buy 51.84 m². At $12/sheet, cost is $216.00.

Check sheet layout and the specified board system before ordering or installation.

Methodology and conversion rules

Guides

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