how much paint do i need

To determine how much paint is needed, the typical method is to calculate the total area to be painted (usually the walls and sometimes ceilings) in square meters or square feet, subtracting the areas of windows and doors. Then, divide that area by the paint coverage rate provided by the paint manufacturer, which is often about 10 square meters per liter (or roughly 400 square feet per gallon). Multiple coats typically require multiplying the amount of paint by the number of coats planned. A general rule of thumb is that 1 gallon of paint covers about a 10x10 foot room with an 8-foot ceiling for one coat, which is roughly 100 square feet per gallon. For an exact calculation, measure the length and height of each wall, calculate the total paintable surface area, subtract unpainted areas (windows and doors), and divide by the paint coverage rate per liter or gallon. Then multiply by the number of coats you plan to apply. This formula and approach are used in paint calculators found online and from paint manufacturers, factoring in nuances such as paint quality, color changes, and surface texture. If specific room dimensions or paint type are provided, a more precise quantity can be calculated. Would it be possible to share those details? Otherwise, general guidelines can be provided for commonly sized rooms.