Room paint calculator — walls, ceiling & shopping list

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 four-by-three-metre room with 2.4-metre walls and two square metres of openings, walls are 31.6 m² and the ceiling is 12 m². With illustrative wall coverage of 10 m²/L at two coats and ceiling coverage of 12 m²/L at two coats, they need 6.32 L and 2 L respectively. One primer coat on the walls at 10 m²/L adds 3.16 L.

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.