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Paint Calculation Formula:
The Exterior Paint Calculator helps New Zealand homeowners and professionals estimate the amount of paint needed for exterior painting projects. It calculates the required paint volume based on surface area, paint coverage rate, and number of coats required.
The calculator uses the paint calculation formula:
Where:
Explanation: The formula divides the total area by the coverage rate to determine paint needed per coat, then multiplies by the number of coats for the total requirement.
Details: Accurate paint calculation prevents wastage, ensures you purchase the correct amount, helps with budgeting, and avoids project delays due to insufficient materials. In New Zealand's climate, proper paint quantity is crucial for adequate weather protection.
Tips: Measure the total exterior surface area accurately. Check the paint manufacturer's coverage rate (typically 10-16 m²/L for exterior paints in NZ). Consider adding 10% extra for wastage and touch-ups. For textured surfaces, reduce the coverage rate accordingly.
Q1: What is a typical coverage rate for exterior paint in NZ?
A: Most exterior paints in New Zealand cover 10-16 square metres per litre, depending on surface texture and paint quality.
Q2: How do I calculate the surface area of my house?
A: Measure the perimeter of your house and multiply by the average height. Add areas of gables and subtract areas not being painted (windows, doors).
Q3: How many coats are typically needed for exterior painting?
A: Most exterior projects require 2 coats for proper coverage and durability, especially when changing colors or painting over dark surfaces.
Q4: Should I include wastage in my calculation?
A: Yes, it's recommended to add 10-15% extra paint for wastage, especially for complex surfaces and trim work.
Q5: Does weather affect paint coverage in NZ?
A: Yes, humid conditions can reduce coverage. In NZ's variable climate, consider the weather forecast and adjust calculations accordingly.