MEASURE ONCE. PLAN YOUR PURCHASE.

Deck Board calculator.

Plan a straight board layout using actual board dimensions and your selected gap.

DECK

Your inputs

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.

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.

Actual board 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.

Purchased board 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.

Specified gap

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

∑

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 Deck project

Formula and assumptions

BEHIND THE NUMBERS

How this calculation works.

This straight layout rounds each row to whole purchased lengths before adding allowance. It does not optimise offcut reuse or specify joins.

Boards = rows across width × pieces along lengthCalculated with normalised units

A worked example

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

Length: 4 m
Width: 2 m
Actual board width: 100 mm
Purchased board length: 2 m
Specified gap: 0 mm
Waste allowance: 10 %

Boards to purchase: 44 boards

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.

Check your purchase assumptions

Use installed intersections rather than spare purchased boards for fastener takeoff

Connected work guides and comparisons

Explore deck boards and specified fixings

Browse all work types

Prepare your material measurements and product data

Deck board stock

Find material sheets for this calculator

Compare supplied alternatives and quantity changes

Browse all quantity scenarios

Deck Board 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