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Coverage Formula:
Paint coverage per litre refers to the area (in square metres) that one litre of paint can cover. This measurement is essential for determining how much paint is needed for a painting project and varies depending on the type of paint, surface texture, and application method.
The calculator uses the coverage formula:
Where:
Explanation: The formula multiplies the quantity of paint by its coverage rate to determine the total paintable area.
Details: Accurate coverage calculation helps in budgeting, prevents wastage of paint, ensures adequate supply for the project, and helps achieve consistent finish across the painted surface.
Tips: Enter the amount of paint in litres and the coverage rate in square metres per litre. Check the paint can for the manufacturer's recommended coverage rate, which typically ranges from 6-12 m²/L depending on the paint type.
Q1: What is a typical coverage rate for interior paint?
A: Most interior paints cover 10-12 m² per litre on smooth surfaces, while premium paints may cover up to 14-16 m² per litre.
Q2: How does surface texture affect coverage?
A: Rough or porous surfaces can reduce coverage by 20-40% compared to smooth surfaces due to increased paint absorption.
Q3: Should I include multiple coats in the calculation?
A: Yes, multiply the total area by the number of coats needed. Most projects require 2 coats for proper coverage and durability.
Q4: How do I account for windows, doors, and other openings?
A: Subtract approximately 10-15% from the total wall area to account for these non-paintable surfaces.
Q5: Does paint color affect coverage rate?
A: Dark colors may require more coats for full coverage, effectively reducing the coverage rate compared to lighter colors.