Wallpaper Calculator
Calculate exactly how many wallpaper rolls you need. Interactive room editor with walls, windows, doors, and radiators.
Drag to move · edge handles to resize
Need to buy
- Buy all rolls from the same batch — the dye lot may differ between batches.
- Pattern repeat adds waste per strip. The larger the repeat, the more offcuts.
- Keep 1 spare roll after finishing — matching the same collection later is nearly impossible.
How to Use the Wallpaper Calculator
Set your roll parameters at the top — width (53 cm is the most common standard in Europe), roll length, and pattern repeat if the wallpaper has a repeating design. Add a trim allowance of 10–15 cm per strip and a reserve percentage to cover cutting errors and future repairs.
In the room editor, you’ll see four walls by default. Each wall has a visual preview where you can drag windows, doors, and radiators to match your room’s layout. Resize any element by dragging the handles on the edges. Add more walls for L-shaped rooms or large spaces. Use the + Room button to track multiple rooms in the same session.
How the Calculation Works
The calculator counts the number of vertical strips needed for each wall based on its width, then divides the roll length by the adjusted strip height (room height + trim allowance + pattern waste) to get strips per roll. All results are saved automatically and will be waiting when you return.
Tips for Buying Wallpaper
- Same batch: Always buy all rolls at once from the same production batch. Slight color variations between batches are common.
- Pattern repeat: A 64 cm repeat can waste up to one full repeat per strip. Factor this in before heading to the store.
- Keep extras: Save 1–2 rolls after the job for future repairs — matching discontinued patterns later is nearly impossible.