Construction & estimating · Masonry & finishes
Painting calculator
Litres and tins of paint and primer, with labour.
Standard: Area × coats / spread rate
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Inputs in the worked example
The live calculator starts with these values; change any of them and every result, check and diagram updates instantly.
| Input | Value | Unit |
|---|---|---|
| Surface area | 220 | m² |
| Openings | 18 | m² |
| Top coats | 2 | |
| Spread rate | 14 | m²/L |
| Primer / sealer coat | Yes | |
| Primer spread rate | 12 | m²/L |
| Waste | 10 | % |
| Paint | 22 | $/L |
| Primer | 16 | $/L |
| Labour | 14 | $/m² |
Worked example — results
| Result | Value | Unit |
|---|---|---|
| Net area | 202 | m² |
| Paint | 31.7 | L |
| Tins (10 L + 4 L) | 3 × 10 L + 1 × 4 L | |
| Primer | 16.8 | L |
| Total | $3,796 |
Method, formulas and assumptions
- Litres = area × coats / spread × (1 + waste)
- Rates are example inputs only. Replace them with current supplier quotes and local labour rates.
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For preliminary design and education. Check every result against the current standard and your own engineering judgement before use.