Coverage is the manufacturer's square metres per litre for one coat. Multiply net area by coat count before dividing by coverage. Porosity, texture, color change and application technique affect actual use. The tool rounds to whole cans of the entered size; primer and different finish products should be separate project lines.
Worked reference example
Illustrative inputs in metres and SI units; the price is an example entered by the user, not a market quotation. Numeric reference verified by the automated test suite.
- Length
- 4
- Width
- 3
- Area deductions (trim tool: length)
- 0
- Number of coats
- 2
- Coverage per pack (paint: m²/L)
- 2.2
- Allowance
- 10
- Can size (L)
- 5
- Price per purchase unit
- 2
- Result
- 3
- Cost (example currency units)
- 6
Calculation method
V = A × n / E × (1 + r / 100); N = ceil(V / Vₚ)Measure. Calculate. Build.
- Use actual dimensions and split complex rooms into rectangles.
- Allow for cuts, joints and package sizes. Compare stock formats.
- Combine your results in a shopping list you can save and print.
Sources & limits
Planning estimates; verify measurements and product data before purchasing.
Prices are supplied by you. Area estimates do not establish a feasible cutting arrangement. These tools do not assess structural loads or issue construction approvals.