Three walls measure 4.2 × 2.6 m, 3.1 × 2.6 m, and 2.4 × 2.6 m. A 0.9 × 2.1 m door and 1.2 × 1.4 m window are excluded. The user chooses two coats and copies 10 m²/L from the exact label. A container holds 2.5 L and costs €29.90. These inputs demonstrate stages, not universal coverage or a recommendation. The fourth wall, ceiling, trim, primer, texture, absorption, waste, labour, tax, and delivery are outside the project.
From 25.22 m² gross to 4.33 L
Wall areas are 10.92, 8.06, and 6.24 m², totalling 25.22 m². Door and window are 1.89 and 1.68 m², totalling 3.57 m². Net area is 25.22 − 3.57 = 21.65 m². Separate rows show that no standard opening or fourth wall was inserted. Two coats make 21.65 × 2 = 43.30 coated m². With the supplied 10 m²/L, required volume is 43.30 ÷ 10 = exactly 4.33 L. No early rounding, waste, porosity, or default coverage changes it.
Round to two 2.5 L containers and €59.80
Dividing 4.33 L by 2.5 L gives 1.732 containers, rounded upward to 2 whole units. Purchase volume is 5.00 L. The 0.67 L difference is caused by package size, not another coat or hidden allowance. Optional cost is 2 × €29.90 = €59.80. PaintCalc does not search mixed can sizes, compare brands, fetch live prices, calculate tax or delivery, or judge returns. Confirm net contents, coverage, product code, tint, batch guidance, stock, price, supplier rules, and final quantity before buying.