DEDUCTIONS AND EXISTING STOCK

Exterior paint — excluded opening area scenarios.

How does changing excluded opening area affect exterior paint when the other inputs stay fixed?

What this decision changes

A known internal space, existing stock or shared quantity must enter the correct subtraction or eligibility step rather than being counted as new material. Method basis: Gable height is measured above the rectangular wall. Each facade has its own openings. Product coverage must match the selected surface and application.

The focus is excluded opening area in the first repeated measured entry. Other repeated entries keep their own supplied values.

Area = Σ(width × height + width × gable height / 2 − openings)Exterior Paint Calculator

Evaluate your supplied alternatives

Start with your measured plan and selected product data. The initial values and range are illustrative. Each scenario changes only excluded opening area in the first repeated entry; the other entered values stay fixed.

Display units

Measured plan and product inputs

Chosen product coverage

m²/L

Where to get this value

Use the usable coverage or mixed yield printed on your product label for the stated application. Do not substitute bag weight for finished volume.

Your number of coats

Container volume

Where to get this value

Use the actual usable quantity or dimensions of the product you intend to buy. Check the label and the unit shown here.

Waste allowance

Shortcuts only; choose your own allowance above.

Where to get this value

Enter your own allowance. Presets are input shortcuts, not a construction recommendation.

Facade 1 · entry varied by the range

Facade width

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Rectangular height

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Triangular gable height

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Excluded opening area

m²

Where to get this value

Measure only the area, length or quantity to deduct, in the unit shown. Keep this consistent with the surface being calculated.

Supplied comparison range for excluded opening area

Lower supplied comparison value

m²

Where to get this value

Measure only the area, length or quantity to deduct, in the unit shown. Keep this consistent with the surface being calculated.

Upper supplied comparison value

m²

Where to get this value

Measure only the area, length or quantity to deduct, in the unit shown. Keep this consistent with the surface being calculated.

Nine evenly spaced values are evaluated. Whole counts are rounded to distinct integer scenarios. Values between the listed samples are not calculated.

9 evaluated scenarios

Baseline: Paint containers to purchase — 1 container. Rejected combinations remain visible below.

Quantity to plot

Each bar is one actual calculated net facade area. Horizontal values: excluded opening area in m². Only the first repeated entry varies.

Excluded opening area	Net facade area	Change from baseline	Purchase result	Use this scenario
2.4 m²	21.6 m²	1.6 m²	1 container	Open in calculator Exact quantity breakdown Net facade area 21.6 m² Paint required 4.752 L
2.9 m²	21.1 m²	1.1 m²	1 container	Open in calculator Exact quantity breakdown Net facade area 21.1 m² Paint required 4.642 L
3.4 m²	20.6 m²	0.6 m²	1 container	Open in calculator Exact quantity breakdown Net facade area 20.6 m² Paint required 4.532 L
3.9 m²	20.1 m²	0.1 m²	1 container	Open in calculator Exact quantity breakdown Net facade area 20.1 m² Paint required 4.422 L
4.4 m²	19.6 m²	-0.4 m²	1 container	Open in calculator Exact quantity breakdown Net facade area 19.6 m² Paint required 4.312 L
4.9 m²	19.1 m²	-0.9 m²	1 container	Open in calculator Exact quantity breakdown Net facade area 19.1 m² Paint required 4.202 L
5.4 m²	18.6 m²	-1.4 m²	1 container	Open in calculator Exact quantity breakdown Net facade area 18.6 m² Paint required 4.092 L
5.9 m²	18.1 m²	-1.9 m²	1 container	Open in calculator Exact quantity breakdown Net facade area 18.1 m² Paint required 3.982 L
6.4 m²	17.6 m²	-2.4 m²	1 container	Open in calculator Exact quantity breakdown Net facade area 17.6 m² Paint required 3.872 L

Read the evaluated results

Watch the net requirement and actual order separately. Invalid rows identify combinations that cannot satisfy the method's geometric or stock-basis constraints.

Replace every illustrative baseline measurement and selected product value with the inputs for your actual task.
Enter a comparison range on the focused input's stated unit and quantity basis.
Review rejected combinations and use the exact detail lines to distinguish measured demand from whole purchases.
Open an evaluated scenario in the full calculator to save its original inputs and quantity breakdown to a browser material project.

Keep the comparison within scope

The supplied cavity, exclusion or stock eligibility must already be valid; the result does not select a safe shell, opening or construction detail.

Uses supplied geometry, product properties and purchasing specifications.

Does not choose or certify construction dimensions, spacing, loads or regulatory requirements.

Only the listed samples are evaluated. Intermediate values, alternate constraints and global cutting optimality are not inferred from the graph.

Continue with this quantity method

Exterior Paint Calculator

Other independent input decisions

Prepare the actual material data

Read the measurement and purchase guides

Keep per-coat paint coverage separate from completed-system coverage

Quantity method and illustrative scenarios checked 6 October 2026. Methods and scope.