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Both calculators run independently — change the inputs on either side to compare results.

Paint Coverage Calculator

Calculate the exact number of paint gallons required for any surface area, factoring in multiple coats and a configurable waste allowance. Useful for both DIY painters and professional contractors bidding jobs.

Total Wall Area (sq ft)

Doors & Windows Area (sq ft)

Number of Coats

Paint Coverage per Gallon

Waste Buffer

Fill in the required fields to see your result.

Construction

Multi-Room Paint Calculator

Estimate the gallons of paint needed for a whole project across several rooms. Enter the number of rooms, average paintable wall area, the percentage taken up by doors and windows, how many coats you plan, and your paint's coverage to get a precise gallon count.

Number of Rooms (rooms)

Avg Wall Area per Room (ft²)

Doors & Windows (%)

Number of Coats (coats)

Paint Coverage

Fill in the required fields to see your result.

Key differences

	Paint Coverage Calculator	Multi-Room Paint Calculator
Category	Construction	Construction
Inputs required	5	5
Result	Paint Needed (gallons)	Gallons of Paint Needed (gallons)
What it does	Calculate the exact number of paint gallons required for any surface area, factoring in multiple coats and a configurable waste allowance. Useful for both DIY painters and professional contractors bidding jobs.	Estimate the gallons of paint needed for a whole project across several rooms. Enter the number of rooms, average paintable wall area, the percentage taken up by doors and windows, how many coats you plan, and your paint's coverage to get a precise gallon count.