Deck planner
140 mm boards need 6.9 lineal metres per m²; 180 mm need 5.4; 88 mm need 10.8. Set your deck size below to count boards, clips and joists and see the price.
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How the numbers work
How do I work out how many decking boards I need?
Deck area (m²) × lineal metres per m² for your board width, plus 5–10% waste, divided by the board length. For 140 mm boards that's 6.9 m per m².
How much waste should I allow?
5% for a simple rectangle with full-length boards, 10% if boards need joining, 15% for diagonal boards or lots of corners.
How many hidden clips per m²?
One per board per joist: about 20 per m² for 140 mm boards at 350 mm joist spacing.