Decking & Screw Calculator

Plan Your Deck with Confidence

Our Decking & Screw Calculator is a quick, no-fuss way to estimate how much decking timber and how many screws you’ll need to get your deck sorted. Just select your timber profile, enter the total square metres, choose your joist spacing — and we’ll give you the linear metres of decking required, the recommended screw size, and an estimate of how many to grab.

This is an estimator only, designed to give you a reliable starting point — we suggest adding an extra 5% to your timber order to account for offcuts, miscalculations, or last-minute changes.

Disclaimer:

This decking calculator is an estimator only and is based on standard New Zealand decking practices under typical site conditions. Actual material requirements may vary depending on joist layout, board orientation, terrain, project design, and any unique quirks of your site (like curves, cutouts, or last-minute changes).

We know timber and hardware inside out — but we’re not licensed builders. While we’re always happy to help you sort your materials, we recommend checking in with a qualified builder to confirm quantities and specs before cracking into your deck project.

Got Questions?

Not quite sure what you need, or how much of it? No worries; flick us a message! Whether you’re stuck on post spacing or just need a second opinion, we’re here to help. We aim to get back to you within 24 hours (Sunday excluded as the boss insists we get one day off to crack into our own DIY jobs at home).

Fill in the below and we will get back to you in a jiffy.