Accent wall paint calculator

Enter the width and height of the one wall you are painting — not the whole room. You get the paintable area, the litres you need and how many tins to buy. Nothing is sent anywhere — it all runs in your browser. Switch units below.

Wall width (m)

Wall height (m)

Windows and doors on this wall (m²) Leave at 0 if the accent wall is blank

Paint coverage (m²/l) From the tin — accent colours often cover slightly less than standard emulsion

Number of coats

Tin size

Paintable area: — m²
Paint needed: — l
Number of tins: —

Tins are rounded up. Buy the full tin even if the maths says less — accent colours are the ones you most often need to touch up later.

The formula

An accent wall is calculated from that one wall's area, not the whole room — the formula from a full-room paint calculator will overestimate by three to four times, since most rooms have four walls.

(width × height − openings) × coats ÷ coverage = litres

Worked example for a 3.6 × 2.5 m wall with no openings:

Area: 3.6 × 2.5 = 9 m²
Two coats: 9 × 2 = 18 m² to cover
At 10 m²/l: 18 ÷ 10 = 1.8 l → one 2.5 l tin

Choosing which wall

The best accent wall is usually the first one you see on entering the room, or the one behind the main piece of furniture — a bed headboard, a sofa, or a fireplace. A wall broken up by a window and a door gives you less unbroken colour for the same litres of paint, so for maximum visual impact, pick the wall with the fewest openings.

Coats, primer and colour

Two coats is standard. Accent colours are usually darker or more saturated than the rest of the room, and one coat over a lighter base shows patchy coverage, especially at roller-direction changes near the edges.
Tinted primer saves a coat. Going from a light wall to a deep accent colour (or the reverse) usually needs three coats of colour unless you prime first with a grey- or colour-matched primer — then two is enough.
Buy the full tin, not the exact litres. Accent walls get scuffed and touched up more than the rest of a room; running out of the exact batch means a visible colour mismatch on the next top-up.

Not sure an accent wall will actually work in your room? Decoria.Studio scans the room with your phone and renders the wall in your chosen colour before you buy a single tin, then builds a shopping list for the rest of the makeover.

App Store Google Play

Questions and answers

How much paint do I need for an accent wall?

A typical accent wall, 3.6 m wide and 2.5 m high, is about 9 m² before subtracting any opening. At 10 m² per litre and two coats, that is roughly 1.8 litres — one 2.5 l tin, since most dark or saturated accent colours need the full tin anyway for touch-ups.

Do accent walls need two coats or one?

Plan for two. Accent colours are usually darker or more saturated than the surrounding walls, and a single coat over a lighter base almost always shows patchy coverage, especially near the edges where the roller changes direction.

Which wall should be the accent wall?

The one your eye lands on first when you walk in — usually the wall behind a bed or sofa, or one with a fireplace or architectural feature. Avoid the wall with the most windows and doors: fewer unbroken square metres means less visual impact per litre of paint.

Does an accent wall need primer if the rest of the room is already painted?

Only if you are going from a dark accent colour over a light wall, or the reverse. A grey-tinted primer under a deep colour cuts the number of colour coats from three down to two, which is usually cheaper than buying extra paint of the final colour.