MEASURE ONCE. PLAN YOUR PURCHASE.

Insulation Bay Batt Cut Order calculator.

Tile measured bays separately with a fixed batt format, show unreused cuts and round the combined batt count to packs.

INSULATION

Your inputs

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

Chosen batt 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.

Chosen batt 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.

Batts per pack

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.

Measured bay 1

Bay 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.

Bay 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.

Identical bays

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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Keep the quantity, then use another tool for the remaining parts of your purchase.

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Formula and assumptions

BEHIND THE NUMBERS

How this calculation works.

Tile measured bays separately with a fixed batt format, show unreused cuts and round the combined batt count to packs. Batts = Σ ceil(bay width / batt width) × ceil(bay length / batt length) × count; packs = ceil(batts / pack).

Batts = Σ ceil(bay width / batt width) × ceil(bay length / batt length) × count; packs = ceil(batts / pack).Calculated with normalised units

A worked example

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

Chosen batt width: 0.6 m
Chosen batt length: 1.2 m
Batts per pack: 8
Bay width: 0.5 m
Bay length: 2.4 m
Identical bays: 10

Batt packs to purchase: 3 packs

Each bay is tiled separately in the fixed batt orientation. Offcuts are not reused between bays. Dimensions do not establish fit or thermal performance.

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.

All product dimensions, coverage, density, allowances and joining rules must come from your supplied plan or selected product. No building-code values are inserted.

Method: dimensional arithmetic and user-supplied specifications. Software checks: 2026-10-05. Calculation and review policy.