Exterior Paint Calculator
Estimate exterior wall paint from your home's footprint and wall height. It approximates wall area as the perimeter times height, less ~15% for doors and windows.
Exterior Paint calculator
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How to estimate exterior paint
- Exterior surfaces are rougher, so coverage is lower - plan on ~300 sq ft per gallon per coat.
- Two coats is normal for a color change or weathered siding. Prime bare wood first.
- This estimates field walls only; trim, soffits and accents are separate.
Frequently asked questions
How much paint to cover a house exterior?
A single-story 40x30 home with 9 ft walls has roughly 1,260 sq ft of wall. Two coats need about 8-9 gallons after deductions.