Decking calculator
Planning a new deck? The decking calculator turns your area into linear metres and board counts in seconds – the right numbers before you order the timber. Gap and waste are built in, so you won’t come up a board short on delivery day.
An estimate. The gap affects consumption. Joists are counted as total length at the chosen c/c – add posts/piers and fixings separately.
An estimate, not a finished calculation – check against drawings, regulations and supplier data before pricing or ordering.
How to work out the decking
- Work out the deck area in m².
- Enter the board width and the gap.
- Enter the board length and waste.
- See the linear metres and number of boards.
Don’t forget the substructure
The substructure decides how long the deck lasts. Beyond the boards and joists you’ll still need piers or a foundation and fixings. Buy a board or two extra for cuts and future replacements.
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Frequently asked questions
- How much decking is used per m²?
- It depends on the board width and the gap. With a 95 mm board and a 4 mm gap, each board covers about 99 mm, giving a little over 10 linear metres per m².
- How big a gap should I have?
- Often 3–6 mm depending on the timber’s moisture content – wood swells and shrinks. Lay dry timber tighter and fresh timber wider.
- Does the calculator include the joists and bearers?
- Yes, you get linear metres of joists/bearers at your chosen c/c – 600 mm by default. Building tighter? Lower the c/c and the length updates.
- Does it cost anything?
- No, the calculator is free and requires no account.