MEASURE ONCE. PLAN YOUR PURCHASE.

Trim calculator.

Estimate skirting or baseboard lengths after subtracting doorway gaps.

FLOORING

Your inputs

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

Length

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.

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.

Total gaps to exclude

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.

Purchased piece length

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.

YOUR ESTIMATE

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A clear estimate starts here.

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

KEEP YOUR PROJECT TOGETHER

Plan the full project.

Reuse your dimensions, add the other materials and build a purchase list.

Open Flooring project

Formula and assumptions

BEHIND THE NUMBERS

How this calculation works.

Pieces are estimated from combined length with allowance. Mitres, joins and offcuts are not optimised.

Length = perimeter − excluded gapsCalculated with normalised units

A worked example

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

Length: 4 m
Width: 5 m
Total gaps to exclude: 2 m
Purchased piece length: 3 m
Waste allowance: 10 %

Pieces to purchase: 6 pieces

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: 2026-10-03. Calculation and review policy.

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Trim calculator.

Your inputs

A clear estimate starts here.

Plan the full project.

How this calculation works.

A worked example

Before you purchase

Check your purchase assumptions

Keep the project moving.

Connected work guides and comparisons

Prepare your material measurements and product data

Compare supplied alternatives and quantity changes