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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

Construction

Paint Coverage Calculator

Calculate how many litres of paint you need for a job, given the area to cover, the number of coats, and the spread rate of your specific paint. Lets you order the right amount without overspending on excess or running short mid-coat.

Total Surface Area (m²)

Number of Coats (coats)

Paint Coverage per Liter (m²/L)

Key differences

	Multi-Room Paint Calculator	Paint Coverage Calculator
Category	Construction	Construction
Inputs required	5	3
Result	Gallons of Paint Needed (gallons)	Paint Required (liters)
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 how many litres of paint you need for a job, given the area to cover, the number of coats, and the spread rate of your specific paint. Lets you order the right amount without overspending on excess or running short mid-coat.