Home & DIY calculator
Paint Calculator
Paint Calculator. Use the actual product label and your measured quantities. Starting values are editable examples, not universal rates or product specifications. Keep the units beside each input.
Method and practical checks
- Fence calculation uses full face area; slats and gaps alter real use. Enter the product coverage for the actual surface and finish.
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Your measurements and assumptions
Use the actual product label and your measured quantities. Starting values are editable examples, not universal rates or product specifications. Keep the units beside each input.
| Length | 5 | m |
|---|---|---|
| Fence height | 1.8 | m |
| Sides painted | 2 | |
| Coats | 2 | |
| Coverage per coat | 10 | m²/L |
| Extra allowance | 10 | % |
| Pack size | 2.5 | L |
Method and assumptions
paint_L = actual_paintable_area * sides * coats / label_coverage * (1+extra/100)
Litres = net wall area × coats ÷ coverage, then add the chosen allowance. Tin counts round up; primer and finish coats need separate plans.
Flat ceiling area is the sum of non-overlapping rectangles. Sloped ceilings need measured surface dimensions.
Fence calculation uses full face area; slats and gaps alter real use. Enter the product coverage for the actual surface and finish.
Example with the selected inputs
- Paintable area: 18 m²
- Paint before allowance: 3.6 L
- Required quantity: 3.96 L
- Packs to buy: 2
- Purchase quantity: 5 L
- Left over: 1.04 L
Change the inputs to match your own task. Whole packages are rounded up after allowances, so purchase quantity and actual requirement can differ. Apply each allowance once.