Exterior House Paint Calculator – How Much Paint Do I Need?
Painting the outside of your home? Our free calculator gives you an accurate exterior paint estimate for any house size — render, weatherboard, brick, and more.
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How to Calculate Paint for House Exterior
Painting the exterior of a house is a significant project. Accurately estimating paint quantity saves you from costly over-ordering or running out mid-project. Measure every external wall surface, including gable ends (triangular sections under the roof), and use an exterior-specific coverage rate of 6–10 m²/L depending on surface texture.
Don't forget fascia boards, soffits, eaves, and any other painted timber or metal elements. These are often a different colour and may require separate paint products.
Exterior Paint by House Size
| House Type | Exterior Wall Area | Paint Needed (2 coats) | Budget Estimate |
|---|---|---|---|
| Small cottage / unit | 100–150 m² | 20–30 litres | $400–$800 |
| 2-bedroom house | 200–280 m² | 40–56 litres | $800–$1,500 |
| 3-bedroom house | 280–400 m² | 56–80 litres | $1,100–$2,200 |
| 4-bedroom house | 400–550 m² | 80–110 litres | $1,600–$3,000 |
| Large 5+ bedroom | 550 m²+ | 110+ litres | $2,200+ |
Exterior Surface Types and Coverage
Rendered / Stucco Walls
Most common exterior finish. Smooth render covers at 8–10 m²/L; rough sand render covers 5–7 m²/L. Use a 100% acrylic exterior paint for best durability.
Weatherboard / Timber Cladding
Timber requires 7–9 m²/L depending on age and condition. Old weatherboard may need a primer plus three coats. Always sand and seal gaps before painting.
Brick (Painted)
Previously painted brick covers at 6–8 m²/L. First-time painting on unpainted brick requires a dedicated masonry primer and may need 3 coats.
Colorbond / Metal Cladding
Metal cladding accepts paint well at 10–12 m²/L once properly primed with an appropriate metal primer.
Exterior Painting Tips for Best Results
Pressure wash all exterior surfaces and allow 24–48 hours to dry before painting
Repair all cracks, gaps, and damaged areas before painting — don't paint over problems
Apply exterior primer to all bare or heavily weathered areas
Paint on overcast days — direct sunlight causes paint to dry too fast, leaving brush marks
Work from top to bottom: eaves and fascia first, then walls, then any trim near ground level
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