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Paint Ratio Formula:
The Exterior House Paint Ratio Calculator estimates the amount of paint required to cover an exterior surface based on area, paint coverage rate, and number of coats needed. It helps homeowners and contractors accurately plan paint purchases and avoid waste.
The calculator uses the paint ratio formula:
Where:
Explanation: The formula calculates the base amount of paint needed for one coat (area divided by coverage rate) and multiplies it by the number of coats required for complete coverage.
Details: Accurate paint calculation prevents over-purchasing (saving money) and under-purchasing (preventing project delays). It also ensures consistent color matching across all coats.
Tips: Measure the total paintable area accurately, check the paint manufacturer's coverage rate (typically 250-400 sq ft/gallon), and consider the surface condition when determining number of coats (usually 2-3 for exteriors).
Q1: How do I measure exterior house area accurately?
A: Calculate each wall separately (height × width), subtract window/door areas, and add 10-15% for trim and wastage.
Q2: What affects paint coverage rate?
A: Surface texture, porosity, color changes, and application method can significantly impact coverage. Rough surfaces require more paint.
Q3: How many coats are typically needed for exterior painting?
A: Most exteriors require 2 coats for proper coverage and durability, but 3 coats may be needed for dark color changes or poor surfaces.
Q4: Should I buy extra paint for touch-ups?
A: Yes, purchase 10-15% extra paint for future touch-ups and to account for application variations.
Q5: Does exterior paint calculation differ from interior?
A: Exterior calculations often require more paint due to surface texture and weather considerations. Coverage rates may also differ.