Timber Calculator
Timber decking calculator
Estimate the linear metres of decking you need from your deck area, or estimate how much area a quantity of boards will cover.
Enter your measurements and select Calculate to see an estimate.
How this is calculated
Cover width (m) = (board width + gap) ÷ 1000
Linear metres required = area ÷ cover width
Linear metres with wastage = linear metres × (1 + wastage ÷ 100)
Boards required = round up (linear metres with wastage ÷ board length)
Total linear metres supplied = boards required × board length
Reverse: estimated coverage area = linear metres × cover width
Estimates only. Confirm final quantities against your measured plans and the product's actual cover width before ordering.
Common questions
How accurate is the calculator?
The calculator gives an estimate based on the board width, gap and wastage figures you enter. Always confirm final quantities against your measured plans and the product's actual cover width before ordering.
What is a linear metre?
A linear metre (LM) is a length measurement used to sell decking and structural timber, independent of board width. See our LM and m² guide for a full explanation.
Can it use product-specific board data?
Yes. As catalogue products go live, board dimensions can prefill the calculator automatically.
Prefer us to check your numbers?
Send through your deck dimensions and we will come back with a supply-backed quote and quantities.