Wall Paint Calculator – Free Estimate for Any Wall
Painting a wall? Enter the length and height and get an instant, accurate paint quantity — free, no sign-up needed.
Free Paint Calculator
Paint Calculator
Enter your wall dimensions below
Calculating Paint for Walls
The most common paint calculation is for walls — individual walls or a full set of four walls in a room. The core formula is: Wall Area (m²) = Length × Height. Divide by coverage rate and multiply by number of coats to get litres required.
Our wall paint calculator handles this automatically. Enter your wall's length and height, choose your surface type, and the calculator applies the correct coverage rate instantly.
Wall Paint Calculation Formula
Single Wall Calculation
Wall area = Length (m) × Height (m). Litres = (Area × Coats) ÷ Coverage (m²/L). Example: 4m wall × 2.4m height = 9.6 m². Two coats at 10 m²/L = 1.92 litres. Buy 2 litres.
All Four Walls
Add all individual wall areas: (Length1 + Length2 + Width1 + Width2) × Height. Or: Perimeter × Height. For a 4m × 5m room at 2.4m: 18 × 2.4 = 43.2 m².
Accent or Feature Wall
Measure just that single wall. A 4m wide, 2.4m tall feature wall = 9.6 m². Two coats at 10 m²/L = 1.92 litres. Always buy an extra 10% buffer.
Wall Paint Reference Table
| Wall Size | Area | Paint (2 coats @ 10 m²/L) | Buy |
|---|---|---|---|
| 2m × 2.4m | 4.8 m² | ~1 litre | 1 × 1L tin |
| 3m × 2.4m | 7.2 m² | ~1.5 litres | 1 × 2.5L tin |
| 4m × 2.4m | 9.6 m² | ~2 litres | 1 × 2.5L tin |
| 5m × 2.4m | 12 m² | ~2.5 litres | 1 × 2.5L tin |
| 6m × 2.7m | 16.2 m² | ~3.3 litres | 2 × 2.5L tins |
| 4 walls (4m × 4m room) | ~34 m² | ~6.8 litres | 2 × 2.5L + 1 × 2.5L or 1 × 5L + 2 × 1L |
Wall Painting Tips for Best Results
Fill nail holes and cracks with filler before sanding smooth
Apply painter's tape along ceiling, skirting, and trim edges
Cut in edges with a 2" angled brush before rolling
Roll in a W or N pattern for even, consistent coverage
Feather out wet edges immediately to avoid lap marks
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