Paint Coverage Calculator — Quick & Accurate Online Calculator & Guide
Calculate how many gallons of paint you need for any room. Enter dimensions, number of doors and windows, and coats to get an accurate paint quantity.
✓ Formula verified: May 2026
Paint Calculator
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Gallons Needed (with 10% waste)
1.2 gallons
Buy This Many Gallon Containers
2 gallon(s)
Net Paintable Area
381.0 sq ft
Total Wall Area
468.0 sq ft
What if your room length changes? 12.6 ft → 1.1 gallons · 14 ft → 1.2 gallons · 15.4 ft → 1.3 gallons
Scenario Comparison
Conservative (5%)
$16,470.09
$6,470.09 interest
Your scenario (7%)
$20,096.61
$10,096.61 interest
Aggressive (10%)
$27,070.41
$17,070.41 interest
High-risk (14%)
$40,224.71
$30,224.71 interest
Best return
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Paint Coverage
Paint Needed
1.2 gallons
Total Wall Area
468 sq ft
Paintable Area
381 sq ft
Buy2 gallon(s)
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