Screed Calculator
Work out how much floor screed you need. Enter the area, the calculator returns the number of 20kg bags (allowing for waste) and an indicative cost, assuming a typical screed depth.
How we estimate this
Floor screed coverage depends heavily on depth, a 20kg bag covers roughly half a square metre at a standard 25mm, so a 20m² floor needs around 40 to 45 bags plus waste. Doubling the depth roughly doubles the quantity.
Pricing reviewed: November 2026.
Pricing reviewed November 2026. Indicative Australian costs, not a quote.
Understanding screeds in Australia
Floor screed coverage depends heavily on depth, a 20kg bag covers roughly half a square metre at a standard 25mm, so a 20m² floor needs around 40 to 45 bags plus waste. Doubling the depth roughly doubles the quantity.
For large areas or thick screeds, pre-mixed sand-and-cement delivered by the cubic metre is usually far cheaper than bags, worth pricing both ways once you pass a few hundred kilograms.
Frequently asked questions
How many bags of screed do I need?
Roughly one 20kg bag per half a square metre at 25mm depth, so about 40 to 45 bags for a 20m² floor plus waste. Thicker screed uses proportionally more.
Is it cheaper to buy screed in bags or bulk?
For small jobs, bags. For large areas or thick screeds, pre-mixed delivered by the cubic metre is usually much cheaper, so compare both once you need a few hundred kilograms.
Are you a supplier / trades business?
Everyone on this page is working out what screed 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.