Detailed results and planning tools
View calculations, report and comparisons
Calculation breakdown
These values reflect the editable inputs and assumptions above.
| Quantity | Value |
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Calculation report
Includes formulas, entered assumptions, limitations and sources.
Compare scenarios
Keep up to three alternatives to compare measured values and assumptions.
Estimate panels for each wall and ceiling#
Add rectangular surfaces separately, including a repeat count for identical walls. Enter total large-opening area for each surface. Choose stock panel size, waste and a purchase method; compare common sizes before ordering.
Two counts answer different questions#
Pooled net area divides all net surface area by sheet area, with layers and waste. It assumes offcuts can be reused across the project. Independent surface grids cover each full rectangle separately and choose the smaller of two orientations. They retain openings and do not reuse cuts between surfaces.
Neither count optimizes supported seams, staggered joints or an installation-ready layout. The grid comparison is a geometric check, not permission to install panels in either orientation regardless of framing.
Worked example: one wall with a door#
A 12 × 8 ft wall has 96 ft² gross area. A 3 × 7 ft door removes 21 ft², leaving 75 ft². With 4 × 8 ft sheets, one layer and 10% waste, the area estimate is ceil(75 × 1.10 ÷ 32) = 3 sheets.
The full-wall grid needs three sheets before allowance. Applying 10% to that count and rounding up gives 4 sheets. That difference shows why a door deduction should not automatically become a promised reduction in whole-sheet purchases.
Choose a real stock size#
The comparison includes 4 × 8, 4 × 10 and 4 × 12 ft sheets, plus 1.2 × 2.4 and 1.2 × 3 m stock. Custom width and length remain editable. A metric conversion of a 4 × 8 ft panel is not the same product as a nominal 1.2 × 2.4 m panel.
Estimate different panel products or layer types separately. Cost uses the whole-sheet count from the selected method, optional price per sheet, fixed cost and tax.
After panel takeoff, use the Paint Calculator for finish coats and separate primer. Use the Stud Calculator for framing quantities; panel area does not determine a framing design.
Sources and ordering limits#
USG’s panel installation guide documents panel sizes and measurement context. USG’s wallboard estimator is a separate manufacturer estimator. Thickness, fire rating, framing support and permitted orientation must come from the specified wall or ceiling assembly.