Professionals Estimating Guide

Calculate How Much Paint You Will Need

The average bedroom requires 1 gallon (3.70 litres) of wall paint. A one gallon (3.70 litre) can of wall paint covers about 375 – 400 square feet (35 to 37 square metres).


Example:

Your room to be painted is 12’ x 14’ with 8’ ceilings (3.65m x 4.26m x 2.4m). Calculate the total surface area by multiplying the width by the height for each wall and add them together.
2 x (12 x 8) + 2 x (14 x 8) = 416 sq.ft.
or
2 x (3.65 x 2.4) + 2 x (4.26 x 2.4) = 38.6 sq. metres

Formula: 

total surface area / coverage per can = amount required
416 / 375 = 1.1 gallon (3.70 litre) cans                    

Calculate one room at a time and determine if you need 1 or 2 coats:

One (1) coat of premium paint will cover most surfaces when you are painting over a similar color.
Two (2) coats may be required for major color changes, painting over damaged or old surfaces or if you desire greater durability and coverage.