Compare calculators

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

Paint Calculator (Gallons for a Room)

Calculate how many US gallons of paint you need for a room. Uses the standard 350 sq ft/gallon coverage rate common on US paint cans, adjusted for number of coats.

Total wall area (sq ft)

Number of coats (coats)

Coverage per gallon (sq ft/gal)

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

	Paint Calculator (Gallons for a Room)	Paint Coverage Calculator
Category	Construction	Construction
Inputs required	3	5
Result	Gallons needed (gal)	Paint Needed (gallons)
What it does	Calculate how many US gallons of paint you need for a room. Uses the standard 350 sq ft/gallon coverage rate common on US paint cans, adjusted for number of coats.	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.