Reference 1
- Room/wall area
- 400 sq ft net
- Coats
- 2
- Coverage
- 120 sq ft/L
- +10% estimate
- 7.4 L
Everyday & Tools
Paint Quantity Calculator
Estimate paint liters required from wall dimensions, door and window cutouts, number of coats, coverage rate, and wastage buffer.
Formula Explanation
Paint liters = ((wall length x height - cutouts) x coats / coverage) x (1 + wastage%)Paint estimation subtracts doors and windows from wall area, multiplies by coat count, divides by paint coverage, and adds a practical wastage buffer.
Step-by-Step Example
- 1Calculate gross wall area from total wall length and wall height.
- 2Subtract door and window cutout areas.
- 3Multiply net paintable area by number of coats.
- 4Divide by coverage per liter and add wastage for touch-ups and roller loss.
Reference
Benchmark Table
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Reference 2
- Room/wall area
- 600 sq ft net
- Coats
- 2
- Coverage
- 120 sq ft/L
- +10% estimate
- 11 L
Reference 3
- Room/wall area
- 1,000 sq ft net
- Coats
- 2
- Coverage
- 140 sq ft/L
- +10% estimate
- 15.7 L
FAQ
Calculate net wall area after doors and windows, multiply by coats, divide by paint coverage, and add a wastage buffer.
Yes. Subtracting cutouts gives a more realistic paint estimate and avoids overbuying.
A 5% to 10% buffer helps cover roller absorption, surface texture, touch-ups, and small measurement errors.
Primer coverage can differ by product and wall condition. Use the product label coverage for best estimates.
Paint required
9.35 L