How Much Spray Paint Do You Need for a Mural?

As a rough guide, one standard 400ml spray can covers roughly 1–2 square metres for a solid fill, depending on the paint's pressure, the colour (light colours and whites typically need more coats), and how experienced you are with even coverage. For a full mural, most artists budget one can per 1–1.5m² of background fill, plus extra for detail work, outlines and colour layering.

Rough coverage by project size

• Small piece / tag (up to 1m²) — 1–3 cans, depending on detail and number of colours.
• Medium piece (2–4m²) — roughly 6–15 cans across all colours used.
• Large wall / mural (10m²+) — budget at least 1 can per 1–1.5m² for background fills alone, then add more for outlines, highlights, shading and multiple colour layers — large murals commonly use 40–100+ cans in total.

What affects how far a can goes

• Colour: whites, yellows and light pastels are usually less opaque and need more coats than dark colours like black.
• Surface: rough, porous surfaces like brick or breeze block absorb more paint than smooth render or metal.
• Cap choice: fat caps cover ground faster but use paint quicker; skinny caps use less paint per line but take longer for large fills. See our Caps & Nibs guide.
• Experience: more experienced writers get more even coverage per can, since even, controlled passes waste less paint than overlapping/re-spraying patchy areas.

Tips to make your paint go further

• Use a fat cap for large background fills, and save detail caps for outlines and fine work.
• Prime or basecoat large areas in a cheaper paint first if the wall is very absorbent, then build colour on top.
• Buy a few extra cans of your base/background colour — running out mid-fill is the most common planning mistake.

These figures are a planning guide, not an exact formula — every wall and every writer's technique is different. If you're planning a specific mural and want help estimating quantities, get in touch and we can help you plan it out. Browse the full range in our Spray Paint collection.