ClarityHow to use this tool
- Enter wall perimeter, height, roll width, roll length, trim per strip.
- Select Calculate to view the result.
- Check the method and assumptions below before using the result.
Input reference and sample values
Use the units and choices shown for each field. Sample values are provided for practice, not as recommendations.
| Input | Format and units | Sample |
|---|---|---|
| Wall perimeter | Numeric value. Unit: m. Must be greater than zero. | 18 |
| Height | Numeric value. Unit: m. Must be greater than zero. | 2.5 |
| Roll width | Numeric value. Unit: m. Must be greater than zero. | 0.53 |
| Roll length | Numeric value. Unit: m. Must be greater than zero. | 10 |
| Trim per strip | Numeric value. Unit: m. Zero or positive. | 0.1 |
Result for these sample inputs
12 rolls
Select Try the example in the form to load these values and calculate them again. This replaces the current form inputs. Compare the result with the method and worked explanation below.
The method, explained
Strips needed = ceil(perimeter/roll width). Strips per roll = floor(roll length/(height + trim)). Rolls = ceil(needed/per roll).
Using wall perimeter = 18 m, height = 2.5 m, roll width = 0.53 m, roll length = 10 m, trim per strip = 0.1 m, the result is 12 rolls. Change these example inputs to match your task; use the method above to check each step.
What to keep in mind
No pattern-repeat allowance or deduction for openings; adjust trim for the selected paper. A material-quantity estimate, not a structural design or building-code check. Confirm site measurements, supplier coverage and waste before ordering.
Methodology maintained by ClarityKit. How these tools are built and checked.