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Spray Paint Coverage Calculator

Estimate how many cans of spray paint your project needs based on area and number of coats.

How it is calculated

Enter the surface area in square metres, the coverage of one can in square metres per coat (from the label), and the number of coats. The tool computes total area = area × coats and cans = ⌈total area ÷ coverage⌉, always rounding up to a whole can. The number of coats is cut down to a whole number, and if it is empty or below 1 it is treated as 1. Area and coverage must be above zero. The result is a minimum: it adds no allowance for overspray, a primer coat, edges, or waste, so many people buy one extra can for a job that sits close to a full can.

Worked example

You want to paint 6 m² of furniture with 2 coats, using cans that cover 2.5 m² each. Total area to cover: 6 × 2 = 12.0 m². Cans: 12 ÷ 2.5 = 4.8, rounded up to 5 cans. With only one coat the area would be 6.0 m² and 6 ÷ 2.5 = 2.4, which means 3 cans.

Try this example →

Common mistakes

  • Entering the coverage per can for all coats instead of per coat. The tool multiplies the area by the coats itself, so a figure that already includes two coats makes the can count too high.
  • Typing square feet when the tool expects square metres. A 25 sq ft label figure is about 2.3 m², not 25.
  • Giving a fractional coat count like 2.5. The number of coats is truncated to a whole number (2.5 becomes 2), so the extra half coat is ignored.
  • Measuring only the flat face of an object. Legs, edges and the inside of drawers add area, and a textured or porous surface lowers the real coverage per can.

About this calculator

The calculation multiplies the surface area by the number of coats needed, then divides by the coverage per can stated on the label (typical aerosol cans cover roughly 25–35 sq ft, or 2–3 m², per coat at normal application distance) to get the number of cans, usually rounded up since partial cans can't be bought. Coverage drops noticeably on porous or textured surfaces and rises on smooth, primed ones, which is why the calculator treats coverage-per-can as an adjustable input rather than a fixed constant.

DIYers repainting furniture, auto-body hobbyists doing panel touch-ups, and crafters spray-painting multiple small items all use this to avoid the common mistake of running out mid-coat, which leaves visible lines where a fresh can's spray pattern doesn't quite match the old one. Buying the right number of cans up front also keeps color batches consistent, since aerosol paint can vary slightly between production lots.

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Comments (1)

  • Editorial team

    Label coverage assumes a smooth, primed surface, so a trial is worth more than the box. Spray one can on a hidden patch, measure the coverage and enter that. For 3.5 m² with two coats, a label value of 2.5 gives 3 cans, but a measured 1.5 gives 5. An exact fit, 7.5 m² at 2.5 in one coat, also returns 3 with nothing to spare. What surface are you painting and how far did a can really go?

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