Plaster and Floor Screed Calculator
Kilograms and bags of dry mix from the area and layer thickness
How it is calculated
Mix weight = area × (average layer / 10 mm) × consumption per 10 mm, plus the reserve. Bags are the weight divided by the bag weight, rounded up.
Consumption and layer range are taken from the manufacturer's pages (in Russian): KNAUF Rotband (8.5 kg/m² at 10 mm; walls 5–50 mm, ceilings 5–15 mm), KNAUF Tribon (17 kg/m² at 10 mm; layer 10–60 mm). Data checked on 13 October 2026; before buying, check the packaging of the mix you choose.
FAQ
Where do I get the consumption per 10 mm?
From the manufacturer's description of the specific mix: it gives the consumption per square metre at a 10 mm layer. It differs between mixes, so you can change it in the calculator. For two KNAUF mixes the values are filled in, with links to the manufacturer's pages.
How do I estimate the average layer thickness?
The layer cannot be thinner than the minimum in the mix instructions at the most protruding point. If the wall leans, the layer is thicker at one edge than at the other; the average thickness is roughly half the sum of the extremes. RenoForge calculates the thickness more precisely from measured wall deviations.
Why does the calculator warn about the thickness?
Every mix has a permissible layer range. If the average layer is outside it, the chosen mix is most likely unsuitable, and the consumption calculated for it is meaningless.