Compare calculators

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

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.

Construction

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.

Key differences

	Multi-Room Paint Calculator	Paint Coverage Calculator
Category	Construction	Construction
Inputs required	5	5
Result	Gallons of Paint Needed (gallons)	Paint Needed (gallons)
What it does	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.	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.