Paint calculator: gallons for your walls

One wall per line: its length, its height and what doesn't get painted (doors, windows). You get the net area, the area to cover and the gallons to buy.

Units

Wall 1

ft
ft
sq ft
sq ft/gal

Result

Fill in the fields to see the result.

A quick estimate. The template handles the whole job: deductions, several walls or rooms, and totals by section.

How it is calculated

Net area = length x height, minus deductions. Area to cover = net area x (primer coats + paint coats). Gallons = net area x paint coats / spread rate, rounded up. By default, as in the template: 1 primer coat, 2 paint coats, 375 sq ft per gallon (9.2 m² per liter).

The whole job in MesuPro

Residential painting

Walls, ceilings, trim and exterior siding, room by room, with deductions, coats and coverage.

Feet and inches by default

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