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MEASURE ONCE. PLAN YOUR PURCHASE.

Siding Panels and Trim calculator.

Estimate effective siding coverage and keep specified trim runs as a separate purchase item.

WALLS

Your inputs

lengthheight

Measurement schematic, not to scale. Use your own dimensions and product specification.

Use measurements from your plan and properties from your chosen product. Any prefilled values are illustrative.

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.

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.

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
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.

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.

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.

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.

Quantity and planning estimate
YOUR ESTIMATE
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A clear estimate starts here.

Enter your dimensions and product details to see the quantity and purchase breakdown.

CONTINUE YOUR PLAN

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Formula and assumptions
BEHIND THE NUMBERS

How this calculation works.

Use installed coverage width, not the full physical panel width. Facade areas include triangular gables and opening deductions. Trim is rounded independently.

Panels = ceil(net facade area × allowance / effective panel area)Calculated with normalised units

A worked example

Illustrative inputs only. Product properties and design dimensions are not recommendations for your project.

Installed effective coverage width
200 mm
Panel / board length
3 m
Specified trim run
8 m
Purchased trim length
3 m
Waste allowance
10 %
Facade 1
Facade width
4 m
Rectangular height
3 m
Gable height
0 m
Opening area
2 m²

Siding panels to purchase: 19 panels

Area-based procurement does not optimise individual panel cuts or determine flashing and fixing requirements.

Before you purchase

Use dimensions from your plan and properties from your chosen product. Any design spacing, section or fixing pattern must already be specified.

Method: dimensional arithmetic and user-supplied specifications. Software checks: 2026-10-04. Calculation and review policy.

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