Exterior Paint Calculator
Enter your size to get exterior paint quantity, plus an estimated cost. Waste is included and prices are editable.
Material needed
Estimated cost
How to calculate exterior paint
Exterior paint at about 350 square feet per gallon. Enter wall area to get gallons.
Formula: quantity = area ÷ 350 sq ft per gallons × (1 + waste %) = 1 gallons.
Worked example
Example: 10 ft × 10 ft = 100 sq ft. Quantity: 1 gallons, about $45 at $45 per gallons.
Tips
Measure the full area, then subtract large openings if you want an exact count. Order a little extra for cuts and breakage, and confirm quantities with your supplier before you buy.
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Frequently asked questions
How much exterior paint do I need?
Example: 10 ft × 10 ft = 100 sq ft. Quantity: 1 gallons, about $45 at $45 per gallons.
How much waste should I add?
Add 10% for straight areas and 15% for areas with many cuts, corners and openings.
Are the prices accurate?
Prices are editable estimates. The defaults are typical US figures, and your local price can be higher or lower.