Estimate paint gallons needed for walls/ceiling.
Enter room dimensions. One gallon typically covers 350–400 sq ft (one coat). Subtract doors/windows if needed.
• Wall area = 2×(L+W)×H. • 1 gallon ≈ 350–400 sq ft per coat. • Add 10% for waste. • Subtract ~15 sq ft per door, ~15 sq ft per window.
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