Paint Calculator – Calculate How Much Paint You Need for Room Painting
The paint calculator calculates required paint amount in gallons based on room or surface measurements, paint coats, and surface absorption. Avoid buying too much paint or running out mid-project.
Enter wall dimensions, height, and window/door area, select number of paint coats (1-3) and surface type (smooth, textured, new), and get the required gallons. The calculator automatically adds 10% waste allowance.
How much paint is used per square foot?
Regular interior paint covers about 350-400 sq ft per gallon with one coat. New or absorbent surfaces use more — about 250-300 sq ft/gallon. For two coats, a 200 sq ft wall needs about 1-1.5 gallons. Painting dark to light often requires 3 coats. The paint calculator makes precise calculations considering all factors.
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Browse all tools →Paint calculator estimates required paint amount based on surface area and paint coverage. Useful tool for renovators who want to buy the right amount of paint.
Enter surface dimensions and select paint type, and the calculator tells you required paint amount.
- Calculate paint needs in square meters and liters.
- Account for number of paint coats needed (typically 2 coats).
- Subtract window and door areas from total area.
Paint consumption depends on paint type, surface quality, and application method.
- Absorbent surfaces (new plaster, concrete) use more paint.
- Roller application typically uses less paint than brush application.
- Dark color over light may require additional coats.
Buy paint all at once – different batches may have slight color variations.
- Better to buy slightly too much than too little – opened containers don't store well.
- Paint coverage is stated on can label – check before purchasing.
- Old paints and solvent waste must be recycled properly.