How to calculate the amount of plaster for walls?

To calculate the plaster, measure the length and width of the room and the height of the walls. Calculate the wall area: 2 × (Length + Width) × Height. Subtract the area of windows and doors. Multiply by the consumption rate (usually 9-17 kg/m²) and the number of layers. Add 10-15% reserve.

How much plaster is needed per 1 m² of wall?

The consumption of plaster depends on the thickness of the layer: with a thickness of 10 mm, the consumption is 8-10 kg/m² for gypsum plaster and 15-17 kg/m² for cement plaster. For every additional millimeter of thickness, approximately 0.8-1 kg/m² is added for gypsum and 1.5-1.7 kg/m² for cement.

What is the difference between gypsum and cement plaster?

Gypsum plaster is lighter, dries faster (1-2 days), and is suitable for dry rooms. Cement plaster is stronger, moisture-resistant, takes longer to dry (5-7 days), and is used for wet rooms and facades. The consumption of cement plaster is higher due to its higher density.

How to calculate plaster for a facade?

For the facade, use cement plaster with a consumption rate of 17-25 kg/m² depending on the thickness of the layer (usually 15-20 mm). Please note that facades require a larger margin (15-20%) due to wind, rain and losses when working at height.

How much plaster is needed for a room of 20 m²?

For a room of 20 m² (for example, 5 × 4 m) with a wall height of 2.7 m, the wall area will be approximately 48.6 m². With a consumption rate of 9 kg/m² (gypsum, 10 mm) and a reserve of 10%, you need: 48.6 × 9 × 1.1 = 481 kg (16 bags of 30 kg each).

How to calculate decorative plaster?

Decorative plaster is applied in a thin layer (3-5 mm), so the consumption is less: 6-10 kg/m². To calculate, multiply the area of the walls by the consumption rate, taking into account the texture (relief textures require more material). Add a margin of 10-15%.

Can gypsum plaster be used in damp areas?

No, gypsum plaster is not suitable for wet areas (bathroom, kitchen, basement). In wet rooms, use cement plaster with the addition of waterproofing additives. Gypsum plaster absorbs moisture and deteriorates.

How to calculate plaster taking into account lighthouses?

Beacons do not affect the consumption of plaster; they are only needed for leveling. Consumption is calculated using the same formula: wall area × consumption rate. Beacons are installed to control the thickness of the layer and are not taken into account in the calculation of the material.

How long does it take for plaster to dry before painting?

Gypsum plaster dries in 1-2 days, cement plaster - 5-7 days. Complete drying before painting is required, otherwise the paint may peel off. Drying time depends on layer thickness, temperature and air humidity.

How to calculate plaster for a ceiling?

For the ceiling, use the ceiling area (Length × Width). The consumption rate is the same as for walls: 9-17 kg/m² depending on the type. Keep in mind that working on the ceiling can increase losses by 5-10%, add a larger margin.

What is rough and finishing plaster?

Rough plaster (spray and primer) - base layer for leveling, consumption 15-20 kg/m². Finishing plaster (covering) - a thin layer of 2-5 mm for final finishing, consumption 3-5 kg/m². Usually used together.

How to calculate warm plaster?

Warm plaster contains insulating additives (perlite, vermiculite), consumption 10-12 kg/m² with a thickness of 10 mm. It is calculated similarly to conventional plaster: area × consumption rate × number of layers × (1 + reserve).

How much plaster in a 30 kg bag is enough for how many m²?

A 30 kg bag of gypsum plaster at a consumption rate of 9 kg/m² (10 mm layer) is enough for 3.3 m². A bag of cement plaster at a rate of 17 kg/m² (15 mm layer) is enough for 1.8 m². Calculation: 30 / consumption rate.

How to calculate plaster for a room with columns?

For columns, calculate the area as perimeter x height and add to the total area of the walls. Use standard application rate. Columns can have complex shapes; add a margin of 15-20% for processing corners and curved surfaces.

Is a primer necessary before plastering?

Yes, primer is required before plastering. It improves the adhesion of the plaster to the surface, prevents water absorption and increases the strength of the coating. Primer consumption: 0.1-0.15 l/m², taken into account separately from the plaster.

How to calculate plaster for a room with a bay window?

For a bay window, measure the area of all the bay window walls and add to the total area. A bay window adds extra space. Use standard application rate. Keep in mind that the corners of the bay window may require more material, add a margin of 15%.

Is it possible to apply plaster in one layer?

For thin layers (up to 10 mm) it can be applied in one layer. For thick layers (15-20 mm) it is recommended to apply two layers to prevent cracking. The first layer is rough, the second is finishing.

How to calculate plaster for concrete walls?

Concrete walls require preliminary preparation (priming, notching for adhesion). Plaster consumption is standard: 9-17 kg/m² depending on the type. The concrete may be uneven, add a 15% margin for leveling.

How much plaster is needed for a two-room apartment?

For a two-room apartment with an area of 50-60 m² with a ceiling height of 2.7 m, the total wall area will be approximately 120-150 m². At a consumption rate of 9 kg/m² you need: 120 × 9 × 1.1 = 1.188 kg (40 bags of 30 kg) for all walls.

How to calculate mechanical plaster?

Mechanical plaster is applied by machine, the consumption is the same as for manual application: 9-17 kg/m². The advantage of mechanical plaster is the speed and uniformity of the layer, which reduces losses. The margin can be reduced to 5-10%.

How to calculate plaster using a grid?

Grid plaster is used to strengthen the coating. Consumption increases by 10-15% due to the filling of the mesh cells. Use an application rate of 10-19 kg/m² instead of the standard 9-17 kg/m² when working on a grid.

How long does it take for gypsum plaster to dry before wallpapering?

Gypsum plaster dries in 1-2 days, but before gluing wallpaper you need to wait for complete drying - 3-5 days depending on the thickness of the layer. Wet plaster under wallpaper can lead to mold.

How to calculate lime plaster?

Lime plaster has a consumption of 8-12 kg/m² with a layer thickness of 10 mm. It is lighter than cement, environmentally friendly, breathable. It is calculated similarly: area × consumption rate × number of layers × (1 + reserve). Suitable for residential premises.

Is it possible to plaster in winter?

Plaster can be applied in winter only at temperatures above +5°C and using anti-frost additives for cement plaster. Gypsum plaster is not used at subzero temperatures. In winter, drying time increases.

How to calculate plaster for a room with niches?

For a room with niches, measure the area of the niche walls and add to the total area. Niches increase the area for plaster. Use standard application rate. Corners and complex niche shapes may require more material, add a 15% margin.

How much does it cost to apply plaster per m²?

The cost of plastering work depends on the type of surface and region. On average: rough plaster 300-500 ₽/m², finishing plaster 400-700 ₽/m². Decorative plaster is more expensive: 800-1,500 RUR/m². Prices do not include materials.

How to calculate plaster for a balcony?

For a balcony, use cement or facade plaster with a consumption rate of 17-25 kg/m². Measure the area of all balcony walls, including railings. Keep in mind that balconies are subject to temperature changes, use a margin of 15-20%.

What is ready-mixed plaster?

Ready-made plaster is sold as a ready-made paste in buckets. The consumption of the finished plaster is indicated on the packaging, usually 1.5-2.5 kg/m² with a layer thickness of 1 mm. It is more convenient to use, but more expensive than dry mixtures.

How to calculate plaster for textured ceilings?

For textured ceilings, consumption increases by 20-30% due to the relief. Use a consumption rate of 11-22 kg/m² instead of the standard 9-17 kg/m², depending on the depth of the texture. Textured surfaces require more material to fill.

How much plaster is needed for a 100 m² house?

For a house of 100 m² with a ceiling height of 3 m, the total wall area will be approximately 360 m² (for a square house 10x10 m). With a consumption rate of 9 kg/m² and a reserve of 10%, you need: 360 × 9 × 1.1 = 3.564 kg (119 bags of 30 kg) for all walls.

How to calculate plaster for clay walls?

Clay walls require special preparation before plastering (strengthening, priming). Standard consumption: 9-17 kg/m². Clay walls may be uneven, add a margin of 15-20%. It is recommended to use lime or cement plaster.

Calculator #1

One site. All calculators.

Plaster calculator

Calculation of the amount of plaster for walls

кг

Units of measurement

99%

Accuracy of calculations

1-2

Standard layers