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Decking and fencing
How many decking boards do I need?

How many decking boards do I need?

By the Plankley team · Last checked 19 October 2026

Work it out: the decking calculator shows the sum for your own measurements, with every figure editable.

Worked example: Order: 26 boards and 8 joists.

Open the decking calculator

Safety: A quantity and geometry estimate, not a design. It's not a substitute for a builder, structural engineer or building control. For anything load-bearing, retaining, on a boundary or that people walk on or lean against, get professional advice and check Building Regulations and planning rules.

On this page

Boards and gaps
Joists and spans (from the maker)
Screws
Waste

Boards and gaps

Joists and spans (from the maker)

Screws

Waste

Related pages

Decking and fencing guides
Decking and fence rules in the uk

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Plankley is an independent site with UK calculators for DIY and the trades. Every figure is a planning estimate: check your supplier's or maker's figures before ordering. We don't test products.

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