Calculation of the amount of paint for walls
An online paint calculator will help you calculate the required amount of paint for painting walls. The dimensions of the room, the number of layers, the consumption rate and the reserve for losses are taken into account.
The paint calculator uses precise formulas to calculate the amount of material based on surface type, application method and operating conditions. Suitable for calculating various types of paints: water-based, oil-based, acrylic, latex. Calculation formula: Total amount of paint = (Area of walls - Area of doors and windows) × Consumption rate (l/m²) × Number of layers × (1 + Stock / 100).
Let's look at practical examples of calculating the amount of paint for various rooms and types of paint:
Standard room with ceiling height 2.7 m, water-based paint
Входные данные:
Length: 4 m, Width: 3 m, Height: 2.7 m
Window and door area: 4.5 m²
Number of layers: 2
Consumption rate: 0.12 l/m²
Stock: 10%Расчёт:
Wall area: 2 × (4 + 3) × 2.7 = 37.8 m²
Usable area: 37.8 - 4.5 = 33.3 m²
Consumption per layer: 33.3 × 0.12 = 4.0 l
Total consumption: 4.0 × 2 × 1.1 = 8.8 lРезультат:
Required: 8.8 l (4 cans of 2.5 l each)
Тип:
Water-based paint
Standard room for painting, it is recommended to take 4-5 cans with a small margin
Spacious living room with large windows, acrylic paint
Входные данные:
Length: 6 m, Width: 5 m, Height: 3 m
Window and door area: 12 m²
Number of layers: 2
Consumption rate: 0.15 l/m²
Stock: 15%Расчёт:
Wall area: 2 × (6 + 5) × 3 = 66 m²
Usable area: 66 - 12 = 54 m²
Consumption per layer: 54 × 0.15 = 8.1 l
Total consumption: 8.1 × 2 × 1.15 = 18.6 lРезультат:
Required: 18.6 l (8 cans of 2.5 l each)
Тип:
Acrylic paint
For large rooms it is recommended to increase the margin to 15%
Kitchen where part of the walls is covered with tiles, only the upper part needs to be painted
Входные данные:
Length: 4 m, Width: 3 m, Height: 2.7 m
Area under tiles: 15 m²
Window and door area: 3 m²
Number of layers: 2
Consumption rate: 0.12 l/m²
Stock: 10%Расчёт:
Wall area: 2 × (4 + 3) × 2.7 = 37.8 m²
Area to be painted: 37.8 - 15 - 3 = 19.8 m²
Consumption per layer: 19.8 × 0.12 = 2.4 l
Total consumption: 2.4 × 2 × 1.1 = 5.3 lРезультат:
Required: 5.3 l (3 cans of 2 l each)
Тип:
Water-based paint
It is better to choose washable paint for the kitchen
Bedroom with good surface preparation, finishing coat
Входные данные:
Length: 4.5 m, Width: 3.5 m, Height: 2.5 m
Window and door area: 5 m²
Number of layers: 1
Consumption rate: 0.1 l/m²
Stock: 5%Расчёт:
Wall area: 2 × (4.5 + 3.5) × 2.5 = 40 m²
Usable area: 40 - 5 = 35 m²
Consumption per layer: 35 × 0.1 = 3.5 l
Total consumption: 3.5 × 1 × 1.05 = 3.7 lРезультат:
Required: 3.7 l (2 cans of 2 l each)
Тип:
Finish paint
For the finishing layer the consumption is usually less
Children's room requiring high-quality coating
Входные данные:
Length: 4 m, Width: 3.5 m, Height: 2.7 m
Window and door area: 6 m²
Number of layers: 3
Consumption rate: 0.12 l/m²
Stock: 15%Расчёт:
Wall area: 2 × (4 + 3.5) × 2.7 = 40.5 m²
Usable area: 40.5 - 6 = 34.5 m²
Consumption per layer: 34.5 × 0.12 = 4.1 l
Total consumption: 4.1 × 3 × 1.15 = 14.1 lРезультат:
Required: 14.1 l (6 cans of 2.5 l each)
Тип:
Eco-friendly paint
For children's rooms, it is recommended to use safe paints and increase the number of layers.
Narrow corridor with minimal windows
Входные данные:
Length: 6 m, Width: 1.2 m, Height: 2.5 m
Door area: 2 m²
Number of layers: 2
Consumption rate: 0.12 l/m²
Stock: 10%Расчёт:
Wall area: 2 × (6 + 1.2) × 2.5 = 36 m²
Usable area: 36 - 2 = 34 m²
Consumption per layer: 34 × 0.12 = 4.1 l
Total consumption: 4.1 × 2 × 1.1 = 9.0 lРезультат:
Required: 9.0 l (4 cans of 2.5 l each)
Тип:
Wear-resistant paint
For corridors it is better to choose paints with increased wear resistance
The calculator uses proven formulas taking into account all room parameters and paint type to obtain an accurate result.
Correct calculation allows you to avoid overuse of material and unnecessary costs for purchasing unnecessary paint.
Knowing in advance the required amount of paint, you can plan the budget and purchase of materials for repairs.
To calculate paint, use the formula: (Area of walls - Area of windows and doors) × Consumption rate (l/m²) × Number of layers × (1 + Stock / 100). The consumption rate is usually 0.1-0.15 l/m².
Paint consumption is usually 0.1-0.15 l/m² for one layer. For water-based paint, the consumption may be lower, for oil-based paint it may be higher.
Usually 2 layers of paint are enough for a high-quality coating. Dark colors may require more layers on top of light colors.
To calculate ceiling paint, use the ceiling area (length x width) instead of the wall area. Formula: Ceiling area × Consumption rate × Number of layers × (1 + Reserve / 100). The ceiling usually requires 2 coats of paint.
It is recommended to take a reserve of 10-15% of the calculated amount of paint. This compensates for losses during application, cutting and possible errors in calculations. For large rooms, the reserve can be increased to 15-20%.
Water-based paint is the general name for water-based paints, including acrylic. Acrylic paint has acrylic binders and is more durable. For calculations, use the same consumption rate of 0.1-0.15 l/m².
The calculation of paint for the facade is similar to interior work, but the consumption rate may be higher (0.15-0.2 l/m²) due to the unevenness of the surface. Consider the area of all walls of the building and subtract windows and doors.
The cost of painting depends on the type of paint (from 200 to 2000 rubles per liter), the area of the room and the number of layers. Use a calculator to determine how much paint you need, then multiply by the price per liter.
For the kitchen, choose washable paint with a high resistance to moisture and grease. The consumption of such paints is usually standard - 0.12-0.15 l/m². 2 layers are recommended for protection.
Primer is required for new walls and recommended for old ones. The primer reduces paint consumption by 10-20% and improves adhesion. Paint calculation does not include primer.
For an irregularly shaped room, measure each wall separately, then add up the areas. Formula: Area = (Wall1 + Wall2 + Wall3 + Wall4) - Area of windows and doors. Use this area in the calculator.
For the bathroom, use moisture-resistant paint with a consumption of 0.12-0.15 l/m². 2-3 layers are recommended to protect against moisture. Take into account the small room and possible uneven walls.
Water-based paint dries in 2-4 hours at room temperature. Acrylic paint dries in 4-6 hours. Oil paint dries in 24-48 hours. Consider drying time when planning your work.
For a room with arches, measure the area of the arches separately as part of the walls or subtract from the total area. Arches usually occupy a small area and do not greatly affect the calculation. Use the standard formula.
Dark paints may require 3 coats instead of 2 to evenly cover a light surface. Light colors can be covered well in 2 coats. Take this into account when calculating, increasing the number of layers for dark colors.
For wooden walls, the consumption rate is higher due to absorbency - 0.15-0.2 l/m². Pre-priming is recommended. Typically 2-3 coats of paint are required for good coverage.
A brush consumes 10-15% more paint than a roller. The spray gun is the most economical - 5-10% less consumption. For calculations, use the average consumption rate taking into account the tool.
Old paint can be used if it has not thickened or changed color. Check consistency and stir before use. The consumption of old paint may be slightly higher.
For drywall, the standard consumption rate is 0.12 l/m², but preliminary priming is required. Usually 2 layers of paint are enough. Consider the area of all sheets of drywall.
For a standard 3x4 m room with a ceiling height of 2.7 m, about 8-10 liters of paint per 2 layers are required. An accurate calculation can be obtained using a calculator with the parameters of your room.
The door area is subtracted from the total wall area before calculation. Measure the width and height of each door, multiply and subtract from the wall area. A standard door occupies 1.8-2 m².
For a balcony, measure the area of all walls and ceiling if it will be painted. The standard consumption rate is 0.12 l/m². Keep in mind that for a balcony it is better to use façade paint that is resistant to temperature changes.
Hiding power is the ability of paint to cover the color of a surface. High hiding power means less consumption. The hiding power is indicated on the paint can and affects the application rate. The higher the hiding power, the lower the consumption.
For a ceiling with texture, the consumption rate is 20-30% higher due to the increased surface area. Use a flow rate of 0.15-0.18 l/m² instead of the standard one. A textured surface requires more paint.
Water-based paint can be diluted with water up to 5-10% for ease of application. Thinning slightly increases consumption, but improves spreadability. When calculating, take into account the standard consumption rate.
For a room with columns, measure the area of the columns as part of the walls (perimeter x height) and add to the total area of the walls. Columns require a standard paint consumption rate of 0.12 l/m².
The height of the walls affects the area, but not the flow rate. For a 4 x 3 m room with a height of 3 m, wall area = 2 × (4 + 3) × 3 = 42 m². At a consumption rate of 0.12 l/m² and 2 layers you need: 42 × 0.12 × 2 × 1.1 = 11.1 l.
For a room with a bay window, measure the area of all walls, including the bay window walls. A bay window adds additional wall space. Use the calculator with the total area of all surfaces to be painted.
Air temperature affects drying time, but only slightly on consumption. At high temperatures, paint dries faster and may require an additional coat. At low temperatures, consumption may increase slightly.
For a room with niches, measure the area of the niche walls and add to the total area. Niches increase the area for painting. Use the standard application rate of 0.12 l/m² for all surfaces.