Interior & Exterior Wall Paint & Primer Gallons Coverage Calculator
Calculate exact Liters and Gallons of wall paint and bonding primer needed for any room or house facade, automatically deducting window and door openings across 1 or 2 coats.
Calculator Inputs
Live Real-TimeTotal Paint Volume Needed (Liters)
Total Paint Volume in US Gallons
3.1 gal
Primer / Undercoat Needed (Liters)
6 L
Detailed Calculation Breakdown
Calculation Methodology
Net Surface Area = Total Gross Wall Area - (Doors * 21 sq ft + Windows * 15 sq ft). Total Paint Gallons = (Net Area * Number of Coats) / 350 sq ft/gal.
Important Legal & Educational Disclaimer
One standard gallon of quality interior latex paint covers roughly 350 to 400 square feet (approx 10 m² per Liter) per coat on prepped surfaces.
This calculator is designed for educational and informational purposes only based on public statutory frameworks. The outputs do not constitute binding financial, tax, or legal advice. We assume no liability for decisions made based on these estimations. Always verify with the relevant official authorities or a certified professional advisor.
Frequently Asked Questions
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