Estimate how much plaster you need for walls and ceilings, the number of bags and the total cost in metric or imperial units.
Working out quantities up front helps you avoid running short mid-job or wasting material. Over-ordering ties up money, while under-ordering causes delays — a quick estimate keeps your project moving and your budget on track.
No. Switch to "Work it out from dimensions" and enter the room length, width and wall height. The calculator multiplies them out for the walls, and can add the ceiling too, so you don’t need to do the maths by hand. You can still type a total area directly if you prefer.
Measure the length and height of each wall, multiply them to get the area, and add together for all walls and ceilings to get the total. Or just use the dimensions mode and let the calculator do it.
Typical plaster thickness is 10–15 mm (about 0.4–0.6 in), but always check your project requirements or follow manufacturer guidelines.
Simply input the coverage stated on your plaster bag packaging to get an accurate calculation based on your specific product.
The calculator multiplies the volume of plaster needed by a standard density (850 kg/m³ or 53 lb/ft³) to estimate the total plaster mass.
No, it only estimates the plaster material needed and its cost. Always budget separately for labour and other materials like beads or scrim tape.
