Canadian cans, measured in litres
The paint calculator opens on Dulux Lifemaster Interior. Its data sheet quotes 37 square metres, or 400 square feet, per 3.78 litre can, and the calculator divides that out to 9.8 m² per litre. The can sizes are the three dulux.ca uses: 946 ml (a quart), 3.78 L (a gallon) and 18.9 L (a five-gallon pail).
The bedroom already entered takes about 9.9 litres for two coats. The least-left-over answer is two 3.78 litre cans and three 946 ml cans. Underneath, the fewer-cans line offers three 3.78 litre cans: about 0.9 litres more paint, but three cans instead of five, and quarts cost more per litre.
Ranges, and what the low end means
Several of the Canadian data sheets give a range rather than one figure: 28 to 37 m² per 3.78 litres for Lifemaster Interior Ceiling, 23 to 37 for Diamond Exterior, 35 to 39 for Weatherguard Exterior. The low end is what goes in the box, as the cautious figure for textured or porous surfaces. On smooth drywall that is already painted, the top of the range is closer.
Primer and bare surfaces
Dulux Canada recommends two topcoats on all surfaces. On bare drywall or wood, its sheets add, the first of two coats serves as primer, so the two-coat figure covers that case too.
Dulux paints in the calculator: the range sold in Canada
| Paint | For | Coverage, as stated | Tins |
|---|---|---|---|
| Lifemaster Interior | Walls | 37 m² (400 sq ft) per 3.78 litres | 18.9 L, 3.78 L, 946 ml |
| Diamond Interior | Walls | up to 37 m² (400 sq ft) per 3.78 litres | 18.9 L, 3.78 L |
| Ultra Interior | Walls | approximately 37 m² (400 sq ft) per 3.78 litres | 18.9 L, 3.78 L |
| Lifemaster Interior Ceiling | Ceilings | 28–37 m² (300–400 sq ft) per 3.78 litres | 18.9 L, 3.78 L |
| Weatherguard Exterior | Outside walls | 35–39 m² (375–420 sq ft) per 3.78 litres | 18.9 L, 3.78 L, 946 ml |
| Diamond Exterior | Outside walls | 23–37 m² (250–400 sq ft) per 3.78 litres | 18.9 L, 3.78 L, 946 ml |
What one room takes in each
Two coats. Rooms: 4 × 3.5 m room with 2.5 m walls, one door, one window, walls and ceiling (ceiling only for a ceiling paint). Outside: 8 × 10 m house with 5.2 m walls and two gables.
| Paint | Area | Paint, 2 coats | Buy |
|---|---|---|---|
| Lifemaster Interior (room, 9.79 m²/L) | 48.6 m² | 9.9 L | 2 × 3.78 L + 3 × 946 ml (fewer cans: 3 × 3.78 L) |
| Diamond Interior (room, 9.79 m²/L) | 48.6 m² | 9.9 L | 3 × 3.78 L (fewer cans: 1 × 18.9 L) |
| Ultra Interior (room, 9.79 m²/L) | 48.6 m² | 9.9 L | 3 × 3.78 L (fewer cans: 1 × 18.9 L) |
| Lifemaster Interior Ceiling (ceiling, 7.41 m²/L) | 14 m² | 3.8 L | 1 × 3.78 L |
| Weatherguard Exterior (house, 9.26 m²/L) | 189.8 m² | 41 L | 2 × 18.9 L + 1 × 3.78 L |
| Diamond Exterior (house, 6.08 m²/L) | 189.8 m² | 62 L | 2 × 18.9 L + 3 × 3.78 L + 14 × 946 ml (fewer cans: 2 × 18.9 L + 7 × 3.78 L) |
Coverage per coat for the Dulux range sold in Canada, from the maker's pages linked above, checked September 2026. Dulux and its product names are its owner's trademarks, used only to describe the products; Meadow Tools is not affiliated with or endorsed by Dulux.