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Railing Material calculator.

Count infill elements for a railing opening using your already specified dimensions.

DECK

Your inputs

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.

Quantity and planning estimate
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.

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Formula and assumptions
BEHIND THE NUMBERS

How this calculation works.

The equal-gap layout includes a gap at each end. Input spacing is not assessed for code compliance or safety. Structural posts are excluded.

Elements per opening = ceil((opening − gap) ÷ (element width + gap))Calculated with normalised units

A worked example

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

Clear opening between posts
1 m
Actual infill width
50 mm
Specified maximum clear gap
100 mm
Identical openings
2

Infill elements: 12 elements

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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