Decking Calculator
Calculate the number of deck boards needed from deck area and board size, including waste allowance for DIY and construction.
Calculate the number of decking boards needed based on your deck area and board dimensions, including a reasonable waste factor. Perfect for DIY enthusiasts and contractors planning material orders.
📊 Result Chart
About Decking Calculator
Decking Calculator is a free online tool that calculates the number of deck boards needed from deck area and board size, including 10% waste allowance, helping DIY enthusiasts and contractors estimate material costs. Works on mobile and desktop, all calculations run locally in your browser.
Decking Calculator in 3 steps
- Enter total deck area (m²)
- Enter single board area (m²)
- Click "Calculate" to see required board count
How many deck boards do I need?
Divide your total deck area by the area of a single board, then round up to get the exact board count. Add roughly 10% extra for waste from cuts and offcuts.
Is the decking calculator free?
Yes, the decking calculator is completely free with no registration required. All calculations run locally in your browser and no data ever leaves your device.
What waste factor should I use?
A 10% waste allowance is a good default for most decking projects. For complex layouts or diagonal installation, consider using 15-20% instead.