Paint calculator
Wall area, coats (2), coverage (350 sq ft/gal), waste. Gallons, rounded up.
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Wall area (minus openings if you enter them) and coverage per gallon estimate how many gallons to buy for the coats you choose.
Gallons ≈ (area × coats) ÷ coverage. Coverage is a label claim — real porous surfaces drink more paint.
Not a color-matching service or lead-safe work plan. Trim, texture, and primer needs can change the buy list.
FAQ
How is this calculated? Gallons = ceil(sq ft × coats / coverage × (1 + waste/100)).
What is coverage? The label on the can, square feet per gallon, one coat. 350 is a common default.
Why round up? You cannot buy a fraction of a gallon at most stores. Change coverage if your can says otherwise.