Paint calculator
Estimate outputs: Area, Paint required, Primer required. Adjust Length, Height, Openings area to match your project.
Estimate outputs: Area, Paint required, Primer required. Adjust Length, Height, Openings area to match your project.
Inputs and units
Use the units shown beside each field. Replace the sample values with your measurements and the figures on the selected product packaging.
| Parameter | Example input |
|---|---|
| Length | 5 m |
| Height | 2.7 m |
| Openings area | 0 m² |
| Primer coverage | 8 m²/l |
| Coats | 2 |
| Coverage | 10 m²/l |
| Waste allowance | 10 % |
Formula and assumptions
Paint requiredmax(0, Length × Height - Openings area) × Coats × (1 + Waste allowance / 100) / Coverage
Primer requiredmax(0, Length × Height - Openings area) × (1 + Waste allowance / 100) / Primer coverage
ceil = round up; floor = round down; max = the greater value. Trigonometric angles are converted from degrees to radians.
Allowance is applied before rounding to whole packages. Whole units are rounded up; displayed decimals are rounded only for readability.
Coverage depends on the product, substrate and installation method. Enter the supplier’s consumption figures; an area estimate cannot replace a cutting layout.
Worked example
Sample values are examples, not product specifications. Run the calculation again with your own measurements.
| Result | Calculation |
|---|---|
| Area | 13.5 m² |
| Paint required | 2.97 l |
| Primer required | 1.8563 l |
Related calculators
Related tools use separate measurements. Check their inputs before transferring quantities.
These are quantity estimates. Confirm product coverage, site conditions and required dimensions before ordering.