🪚 Decking Calculator
Building a deck is a fantastic way to extend your living space into the garden, but getting the materials right is essential. Buy too few boards, and you'll be waiting to finish the job. Buy too many, and you've wasted money on expensive timber. Our Decking Calculator helps you plan your project with confidence.
Our calculator factors in board width (10cm to 15cm), joist spacing (typically 40-60cm centres), and includes a 10% wastage allowance for cuts and off-cuts. We also give you an estimate for fixings and screws so you can buy everything in one trip.
What our decking calculator does:
- 📐 Deck Area — Enter length and width to get total deck area.
- 🪵 Board Count — Choose board width to get the number of boards needed.
- 📏 Joist Count — Choose joist spacing to get the number of joists required.
- 🔩 Fixings Estimate — Get an estimate for screws and fixings.
💡 Pro Tip: Use treated timber for ground contact and always allow for a 5-8mm gap between boards for water drainage and expansion. For the best finish, stagger the board ends rather than lining them all up in a row.