Paint Calculator
Buy exactly the paint your walls need.
Paint Calculator
Gallons = Area x Coats / Coverage per Gallon
Calculated instantly
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What This Calculator Does
The Paint Calculator estimates the gallons of paint needed for a job based on surface area, number of coats, and paint coverage. It keeps you from buying too little mid-project or too much at the register.
How It Works
Total gallons equal the wall area multiplied by the number of coats and divided by the coverage per gallon. Liters are derived by multiplying gallons by 3.785.
Example
Painting 400 square feet with two coats using 350 sq ft/gallon coverage needs 400 x 2 / 350 = 2.29 gallons, or about 8.7 liters.
Formula
Gallons = Area × Coats / Coverage per GallonReading the Results
Gallons Needed
The paint volume for the job, accounting for surface area and number of coats.
Liters Needed
The same paint volume in metric units, useful where paint is sold by the liter.
Frequently Asked Questions
How much paint do I need for a room?
Calculate the wall area, multiply by the number of coats, and divide by coverage per gallon (typically 350 sq ft). The calculator does all three steps.
How do I measure wall area?
Multiply each wall length by its height and subtract windows and doors. Sum all walls for the total surface.
Does paint coverage vary?
Yes. Smooth primed walls cover near 400 sq ft per gallon, while rough or unprimed surfaces may drop to 250-300 sq ft.