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Decking board quantity calculator UK

Estimate board rows and stock boards for a rectangular deck. Check the formula, worked example and limits before using your own figures.

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Your estimate

Estimated stock boards

24 boards
Board rows across deck21 rows

Use your actual figures. Any prefilled price, fee, rate or return is an editable illustration, not a current product quote. Linear coverage approximation, not a cutting or structural plan. Board joints, usable offcuts, fixing gaps, spans and frame requirements need project-specific checks.

How the decking board quantity calculator uk works

Rows = ceil((deck width + gap)/(board width + gap)). Stock boards = ceil(rows × run length/stock length × allowance).

Data basis: mathematical formula using your inputs. Example prices and rates are illustrative, not current market quotes.

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Worked example: decking board quantity

This illustration uses the calculator’s example inputs. It is not a quote or a recommended financial decision.

Deck run length (m)
4
Deck crosswise width (m)
3
Board face width (mm)
140
Gap between boards (mm)
5
Stock board length (m)
4
Chosen additional stock allowance (%)
10

Estimated stock boards: 24 boards

Rows = ceil((deck width + gap)/(board width + gap)). Stock boards = ceil(rows × run length/stock length × allowance).

Decking board quantity: questions answered

What does the decking board quantity calculation include?

Rows = ceil((deck width + gap)/(board width + gap)). Stock boards = ceil(rows × run length/stock length × allowance). Use your actual figures. Any prefilled price, fee, rate or return is an editable illustration, not a current product quote. Linear coverage approximation, not a cutting or structural plan. Board joints, usable offcuts, fixing gaps, spans and frame requirements need project-specific checks.

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Using your result

Example inputs are a starting point. Replace them with your figures and select Calculate result. Results are rounded for display; calculations use unrounded values.

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