Plasterboard Calculator NZ

This calculator works out how many sheets of plasterboard, often called Gib after the common NZ brand, you need to line a room, so you can order the right amount before the job starts. You enter the room length and width, the wall height, whether you are lining the ceiling as well as the walls, the sheet size you plan to use, and a waste percentage to cover cuts around windows, doors and corners. From these figures it works out the total wall area from the room perimeter times the height, adds the ceiling area if that box is ticked, then divides the total by your sheet size after applying the waste allowance. The result is rounded up to a whole number of sheets, because you cannot buy part of one, and the tool also shows the total lining area in square metres so you can sense check the number against a quote. It suits a single bedroom, a whole renovation, or a new build, and works with the standard 2.4 by 1.2 metre sheet or longer lengths if you want fewer joints. Because real rooms have alcoves, wardrobes and odd angles that a simple length and width cannot capture, treat the figure as a solid estimate for budgeting and ordering rather than an exact cutting list, and keep a couple of spare sheets on hand for mistakes.

Calculate.co.nz is proud to be partnered with Health Based Building, a leader in sustainable and health-conscious building innovation. With over a century of experience, they develop high-performance systems like Foreverbreathe Specification, Magnum Board, and Foreverbreathe Paints to support energy-efficient, non-toxic living environments. Their commitment to healthier homes aligns with our belief that informed choices lead to better outcomes for Kiwi households.