What this calculator does
Wallpaper rolls needed works out rolls required for a room, accounting for pattern repeat. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulaDrop height = ceil(wall height / repeat) × repeat; rolls = ⌈strips / strips per roll⌉
The inputs explained
| Field | What to enter |
|---|---|
| Room length (m) | A number, measured in m. Starts at 5. |
| Room width (m) | A number, measured in m. Starts at 4. |
| Wall height (m) | A number, measured in m. Starts at 2.4. |
| Doors | A number. Starts at 2. |
| Windows | A number. Starts at 2. |
| Roll width (m) | A number, measured in m. Starts at 0.53. |
| Roll length (m) | A number, measured in m. Starts at 10. |
| Pattern repeat (0 = none) (cm) | A number, measured in cm. Starts at 0. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with room length
Every other input is held at the calculator’s starting values while room length varies. Select any row to load that scenario into the calculator.