Concrete Calculator
Estimate volume and bag count for a rectangular slab.
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Paint Calculator
Plan paint quantities from area, coverage, and coats.
02EXAMPLE RESULT
Paint required
9.9
L
Paintable wall area45m²
Total area across all coats90m²
Paint in US gallons2.615303US gal
Results update as you type. Calculate adds a snapshot to your history.
How this calculation works
Subtract unpainted openings from the total wall area, multiply by coats, and divide by the manufacturer’s coverage rate. Surface texture and preparation affect real coverage.
Litres = (wall area − openings) × coats ÷ coverage × (1 + allowance ÷ 100)
Your calculation, step by step
- Paintable area = 50 − 5 = 45 m².
- Before allowance = 45 × 2 ÷ 10 = 9 L.
- With 10% allowance = 9.9 L.
A worked example
45m², two coats, 10m²/L coverage, and 10% allowance need 9.9L.