Paint Volume Formula:
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Definition: This calculator estimates the amount of paint needed based on the area to be painted and the paint's coverage rate.
Purpose: It helps homeowners, painters, and contractors determine how much paint is required for a project.
The calculator uses the formula:
Where:
Explanation: The total area is divided by the coverage rate to determine how many gallons of paint are needed.
Details: Accurate paint estimation prevents over-purchasing (waste) or under-purchasing (project delays), and ensures consistent color application.
Tips: Enter the area to be painted in square feet and the paint coverage rate (default 350 sq ft/gallon). All values must be > 0.
Q1: What's a typical coverage rate for paint?
A: Most paints cover about 350 sq ft per gallon, but this varies by paint type and surface texture.
Q2: Should I account for multiple coats?
A: Yes, multiply the result by the number of coats needed (typically 2 for good coverage).
Q3: How do I measure the area to be painted?
A: For walls: (Length + Width) × 2 × Height. For ceilings: Length × Width.
Q4: Does this include doors and windows?
A: No, you can subtract about 20 sq ft per standard door and 15 sq ft per window.
Q5: Should I buy extra paint?
A: Yes, consider adding 10% to the calculated amount for touch-ups and wastage.