How does the Paint Coverage Calculator work?

Wall area = 2 × (length + width) × height Then: Ceiling area = length × width Then: Total area = (walls + ceiling) × number of coats Then: Litres needed = total area ÷ 10 (coverage rate).

Can you give an example of how to use the Paint Coverage Calculator?

Example: Input 5×4m room, 2.4m ceiling, 2 coats gives a result of ~20 litres needed (8 × 2.5L cans).

Is the Paint Coverage Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Paint Coverage Calculator?

Our Paint Coverage Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Paint Coverage Calculator

Room Length (m)

Room Width (m)

Ceiling Height (m)

Number of Coats

A paint coverage calculator estimates how many litres of paint are needed to cover a room's walls and ceiling. Standard paint covers approximately 10–12 m² per litre, depending on surface texture and paint quality.

Symbol	Name	Unit	Description
area	Area	sq ft	Wall/surface area to paint
cov	Coverage per gallon	sq ft/gal	Typical: 300–400 sq ft/gal
coats	Number of coats	coats	Usually 2; dark→light may need 3
gallons	Paint needed	gallons	Total paint required

Surface	Coverage (m²/L)	Notes
Smooth plaster (emulsion)	12–14 m²/L	Best coverage
Bare plaster (mist coat)	6–8 m²/L	Very absorbent
Rough brick/textured	6–9 m²/L	Absorbs more paint
Gloss/satin woodwork	14–16 m²/L	Less absorptive
Exterior masonry	4–6 m²/L	Most absorptive

References

›Dulux paint coverage guide

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