Decking Board Calculator
Work out how many decking boards you need. Enter the deck area, the calculator converts it to lineal metres of board (allowing for waste) based on a typical board width, plus an indicative cost.
How we estimate this
Decking boards are sold by the lineal metre, so you convert your deck area using the board width. For 140mm boards, each square metre needs about 7.1 lineal metres, plus around 10% for cuts and waste.
Pricing reviewed: November 2026.
Pricing reviewed November 2026. Indicative Australian costs, not a quote.
Understanding decking boards in Australia
Decking boards are sold by the lineal metre, so you convert your deck area using the board width. For 140mm boards, each square metre needs about 7.1 lineal metres, plus around 10% for cuts and waste.
This covers the boards only, the sub-frame (bearers and joists), screws or clips, and any oil or stain are separate. Order from one batch so the timber matches, and keep a few spare boards for repairs.
Frequently asked questions
How many decking boards do I need?
Convert your deck area to lineal metres using the board width. For 140mm boards, allow about 7.1 lineal metres per square metre plus 10% for waste. Enter your area for a figure.
Are decking boards sold by the metre?
Yes, usually by the lineal metre. This calculator converts your deck area into lineal metres of board based on a typical board width, then adds a waste allowance.
Are you a timber / decking supplier?
Everyone on this page is working out what decking board costs because they are ready to hire. Put your business right beneath the calculator, in your state, so you are who they find. From $50/mo.