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Siding Calculator

Estimate siding coverage, panels and waste allowance.

My ProjectNo saved space selectedSave a room once and reuse it here.

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Calculator inputs

Siding project details

Ready to calculate

Wall area

Estimate one rectangular wall at a time. Deduct doors and windows using their combined area.

Wall lengthWall heightOpenings to deduct (m²)Project units

Product coverage

Use the coverage printed on the siding carton/package. A 10% waste allowance is a common planning starting point for larger projects, but complexity can change it.

Waste allowance

Coverage per package (m²)

Optional cost estimate

Add the package price for a material-only siding estimate.

CurrencyPrice per package

Planning estimate only. Verify package coverage, corners, trim, soffit and accessory requirements with the product manufacturer.

Your estimate

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Ready when you are

Enter wall dimensions, openings and package coverage to estimate siding packages and optional cost.

Plan with confidence

How to use the Siding Calculator

Estimate siding for one wall or a rectangular building perimeter, then round the required coverage into full packages.

Step by step

What to enter

Enter wall or building dimensions and choose the appropriate project mode.
Deduct doors and windows where appropriate.
Enter the coverage provided by one package of your chosen siding.
Add waste and optionally enter a package price.

Method

How the calculation works

PlanCalq calculates gross wall area, subtracts the opening area and adds a user-selected waste allowance.

The recommended coverage is divided by the package coverage you enter and rounded up to a complete package.

Calculation summaryGross wall area − openings = net siding areaNet area × (1 + waste %) = recommended coverageRecommended coverage ÷ package coverage = packages required (rounded up)

Common questions