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Current for 2026How we verify data: Methodology →

Paint Calculator

Not sure how much paint to buy before decorating? Our calculator works out the exact number of litres based on the surface area, paint coverage rate, and number of coats. Results include the number of 1-litre, 5-litre, and 10-litre tins you need.

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How we calculate paint quantity

Formula: litres = area (m²) ÷ coverage (m²/l) × coats. The number of tins is rounded up to whole units. Always buy 10–15% more than the calculator result to allow for touch-ups and application losses.

Example paint calculation

Room: 50 m² of walls, paint coverage 10 m²/l, 2 coats. Calculation: 50 ÷ 10 × 2 = 10 litres. Tins needed: ten 1 L, or two 5 L, or one 10 L tin. Recommended: buy one 10 L tin plus one extra 1 L tin as a reserve.

Frequently asked questions about paint and painting

Calculator results are estimates only. Actual paint consumption depends on surface porosity, application technique, coat thickness, and ambient conditions. Always check the data on the paint tin label and consult a specialist.

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Paint quantity needed10Litres of paint
1-litre tins
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5-litre tins
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10-litre tins
1