Decking Screw Calculator
Work out how many decking screws you need. Enter the deck area, as a rule of thumb a deck uses around 30 to 40 screws per square metre with standard joist spacing.
How we estimate this
A deck typically uses around 30 to 40 screws per square metre, based on two screws per board at each joist with joists at about 450mm. So a 20m² deck needs roughly 700 screws, and it is always worth buying a box extra.
Pricing reviewed: November 2026.
Pricing reviewed November 2026. Indicative Australian costs, not a quote.
Understanding decking screws in Australia
A deck typically uses around 30 to 40 screws per square metre, based on two screws per board at each joist with joists at about 450mm. So a 20m² deck needs roughly 700 screws, and it is always worth buying a box extra.
Use the right screw for the job, stainless or coated decking screws for exposed decks, and the correct length for your board thickness. Hidden fastening clips are an alternative that changes the quantity and cost.
Frequently asked questions
How many screws do I need for decking?
Roughly 30 to 40 per square metre with two screws per board at each joist. A 20m² deck needs about 700 screws, so buy a box extra to be safe.
What screws should I use for decking?
Stainless steel or coated decking screws for exposed decks, sized to your board thickness. Hidden fixing clips are an alternative that changes both the quantity and the look.
Are you a timber / hardware supplier?
Everyone on this page is working out what decking screw 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.