Wallpaper calculator
Estimate outputs: Area, Wallpaper drops, Whole rolls. Adjust Wall perimeter, Height, Openings area to match your project.
Estimate outputs: Area, Wallpaper drops, Whole rolls. Adjust Wall perimeter, 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 |
|---|---|
| Wall perimeter | 18 m |
| Height | 2.7 m |
| Openings area | 4 m² |
| Roll width | 0.53 m |
| Roll length | 10.05 m |
| Pattern repeat | 0.64 m |
| Waste allowance | 5 % |
Formula and assumptions
Wallpaper dropsceil(Wall perimeter / Roll width × (1 + Waste allowance / 100))
Whole rollsceil(Wallpaper drops / floor(Roll length / (Pattern repeat > 0 ? ceil(Height / Pattern repeat) × Pattern repeat : Height)))
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.
Wallpaper openings are shown in the net area but do not reduce the full height drop count. Check roll length against the rounded pattern repeat and add trimming length to the entered height.
Worked example
Sample values are examples, not product specifications. Run the calculation again with your own measurements.
| Result | Calculation |
|---|---|
| Area | 44.6 m² |
| Wallpaper drops | 36 |
| Whole rolls | 12 |
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.