Room paint calculator — walls, ceiling & primer

One room, three separate coating quantities

Walls and ceiling can have different paints, coverage and coat counts. Primer is optional and calculated for its chosen surfaces. Round each material up separately; spare primer cannot make up a shortage of ceiling paint.

For a 12-by-10-foot room with eight-foot walls and 20 square feet of openings, walls are 332 sq ft and the ceiling is 120 sq ft. At an illustrative 350 sq ft per US gallon and two coats, they need about 1.897 and 0.686 US gallons separately. One primer coat on the walls at 300 sq ft per gallon adds about 1.107 US gallons. Container counts use the exact quantities before display rounding.

What the shopping list includes

Container sizes, whole-container counts, estimated leftovers and material prices where every size has a price. If a material is unpriced, the known-price subtotal is explicitly incomplete. Brushes, rollers, tape, preparation, labour and delivery are outside the subtotal.

Using the same paint on walls and ceiling?

This planner rounds each coating separately. To combine wall and ceiling area into one paint quantity, use the paint calculator and select “Include the ceiling”. Keep the colour, finish and coat count the same.

Coverage and coats change the result

Manufacturer ranges use their lower coverage value by default. A quoted “up to” coverage is not a guarantee on every surface. Check porosity, colour change, application method and preparation; adjust the form to your current label.